US 6952597

I'll search for the specific patent number and any related litigation.

US Patent 6,952,597 — Verified Summary

Note on scope of search: I searched for this exact number (6,952,597) and its pre-grant publication US 2002/0137550 A1. I found no Federal Circuit 2026 docket entry, IPR, or district-court proceeding naming U.S. Patent 6,952,597 itself. The 2026 CAFC activity involving this patent's one-time assignee, Wildseed Mobile LLC, concerns different patents — U.S. 10,869,169 (Google LLC v. Wildseed Mobile, LLC, No. 24-2178, decided Feb. 13, 2026, and Wildseed Mobile, LLC v. Google LLC, No. 24-1846, decided Apr. 30, 2026). I flag that explicitly so no activity is mis-attributed to '597. Treat the litigation question as "no relevant 2026 CAFC activity found," not "confirmed none exists."

Additional caveat: the Google Patents rendering of the specification is truncated/mangled in places, and the pre-grant publication's claim set differs from the granted claim set. Below I use the granted claim text (47 claims).

---

Bibliographic data

Uncertainty flag: the assignment/ownership chain (GITWIT → Wildseed Ltd. → Wildseed LLC → Varia Mobil/Holdings/LLC → Wildseed Mobile LLC, with security interests held by Silicon Valley Bank, Venture Lending & Leasing IV, and LIT-US Chisum 21-A, LLC) is reproduced from the Google Patents legal-events record. Google Patents itself disclaims accuracy of assignee data, so treat the current-owner line as an unverified listing.

Abstract (as granted)

A wireless mobile phone is provided with an input keypad having a number of touch sensitive keys, and complementary logic to facilitate entry of alphanumeric data through stroking of the touch sensitive keys. Alphanumeric data or commands are entered through selected ones of down, up, right, left, and a number of other patterns of stroking of the touch sensitive keys. As a result, a user may enter alphanumeric data or commands in a much more user friendly manner.

Background / problem addressed

The specification frames the invention against the conventional 12-key numeric keypad, where multi-tap entry ("a quick double press of the '2' key followed by a pause") makes alphanumeric entry "cumbersome, and not user friendly."

---

Independent claims — plain-language overview

The patent has seven independent claims: 1, 21, 41, 42, 43, 46, and 47. Claims 1 and 21 are the apparatus/method pair; 41 and 42 add LED echoing; 43 is directed to ancillary-function usage; 46 is the microcontroller/software-recited apparatus form; 47 is a display-only LED method.

Claim 1 — the core apparatus claim. A wireless mobile phone with (a) an input keypad having multiple touch-sensitive keys and (b) logic coupled to the keypad that interprets a user's key stroking patterns over those keys to enter alphanumeric data or commands. The important limitation is the closing clause: each stroking pattern is made up of one or more stroke-pattern directions, and each stroke-pattern direction is defined by stroking two or more adjacent keys. So the stroke covers a multi-key span, not a single key.

Claim 21 — the core method claim. The method counterpart: monitor the user's key-stroking patterns on the keypad's touch-sensitive keys; then determine the alphanumeric data or command corresponding to the pattern and generate a digital representation of it. Same two-or-more-adjacent-keys definition of a stroke-pattern direction.

Claim 41 — apparatus with LED feedback. A wireless mobile phone with a keypad of physical touch-sensitive keys, each having one or more LEDs, plus logic that interprets key-stroking patterns to enter data/commands and also lights the LEDs to visually echo the pattern being imparted.

Claim 42 — method with LED feedback. Monitors stroking patterns on physical touch-sensitive keys that each have LEDs; determines the corresponding data/command, generates a digital representation, and lights the LEDs to visually echo the observed pattern.

Claim 43 — method framed around ancillary functions. Performing a first operation tied to an ancillary function of the phone (e.g., entering a first data item or command) by imparting a first stroking pattern, and a second operation tied to that ancillary function by imparting a second stroking pattern — with at least one of the two patterns being composed of stroke-pattern directions defined by stroking two or more adjacent touch-sensitive keys.

Claim 46 — apparatus in microcontroller/programming form. A wireless mobile phone with a keypad of touch-sensitive keys plus a micro-controller and associated memory holding programming instructions that interpret stroking patterns to enter data/commands; at least one pattern is composed of stroke-pattern directions each defined by stroking two or more adjacent keys. (Note: claim 46's closing clause refers to "said first and second stroking patterns," which have no antecedent in the claim — a drafting anomaly worth noting for any validity analysis.)

Claim 47 — LED-only method. A method comprising monitoring the user's key-stroking patterns on physical touch-sensitive keys having LEDs, and, in response, lighting the LEDs to visually echo the observed pattern. This claim recites the visual-echo step without reciting the conversion to alphanumeric data/command.

Dependent claims at a glance

• Claims 2–19 / 22–39: add a transceiver (2, 22), display echoing (3, 23), and enumerate stroke directions — down, up, right, left (4–7, 24–27), the two-segment directions down-right, down-left, up-right, up-left, right-down, right-up, left-down, left-up (8–15, 28–35), and the four diagonals: top-to-bottom/left-to-right, top-to-bottom/right-to-left, bottom-to-top/left-to-right, bottom-to-top/right-to-left (16–19, 36–39).
• Claim 20 / 40: the keypad is a touch pad and the "keys" are logically partitioned regions of it.
• Claims 44–45: claim 44 adds a second ancillary function (note its overlap with claim 43's own second-operation language); claim 45 names the ancillary function as telephone directory, calendar, email, or web browsing.

Specification highlights supporting the claims

• "Touch sensitive" means no key depression required — the logic discerns a stroking/gliding motion over the keys, "without requiring the user to depress the keys." Direction is defined objectively against the keypad layout: row [1,2,3] toward row [*,0,#] is "down," the reverse is "up," etc.
• Two hardware embodiments: (i) real physical keys made touch-sensitive via techniques such as embedded capacitors, with differently shaped/surfaced corner keys (103a–103d) for tactile orientation, and LEDs for stroke feedback; (ii) touch pads logically partitioned into at least twelve regions mapped to [1,2,3]/[4,5,6]/[7,8,9]/[*,0,#], where numerics and * / # are entered by "tapping" a region.
• Pattern counts: 21 downward and 21 upward patterns (3 of length one, 9 of length two, 6 of length three, 3 of length four); 12 right and 12 left; 18 each for the two-segment directions; 6 each for the diagonals — the specification states the two directions alone suffice for 26 letters of the English alphabet with 16 patterns left over, and that all directions together enable "over two hundred" entries. Tables I and II give a sample letter/punctuation assignment (e.g., Down [2] = A, Down [2,5] = B, Up [4,1] = G, Right [7,8] = S, Left [9,8] = Z).
• Operation (FIG. 2): monitor for a key touch → detect motion → log the keys stroked (and optionally light their LEDs) → test whether motion continues → upon cessation (determined by a predetermined no-movement time interval), simulate entry of the corresponding alphabet/punctuation/command/string onto the input data path and optionally echo it on the display. An alternate embodiment supports "compound" stroking patterns joined by a length-one "conjunction" pattern, gated by a system-profile setting.
• Architecture (FIG. 3): micro-controller/processor 302, DSP 304, non-volatile memory 306 (hosting the complementary logic 330), GPIO interface 308, and TX/RX 312 supporting CDMA, TDMA, GSM, etc., on bus 314 over circuit board 320.
• Incorporated-by-reference sibling: application Ser. No. 09/767,526, "A Wireless Mobile Phone with Inverted Placement of Antenna and Input Keypad," filed the same day.

Related family members (from the same priority date)

US 6,418,323 B1 (Morse code capabilities), US 7,072,621 B1 (luminescent signaling displays), US 6,944,482 B2 and US 7,212,839 B2 and US 7,499,731 B2 (visualization-supplemented mobile telephony), plus WO 2002/058262 A1.

Prior art cited on the face of the patent (7 references)

US 6,295,052 B1 (Misawa Homes); WO 1997/041677 A1 (Ericsson — tactile keypad for touch sensitive screen); US 6,107,997 A (Ure — touch-sensitive keyboard/mouse); US 5,982,303 A (Smith — entering alpha-numeric data); US 6,310,609 B1 (Nokia — user interface with guide lights); US 5,945,928 A (Tegic — reduced keyboard disambiguating system for Korean); US 6,297,945 B1 (Ricoh — portable terminal with multiple displays).

---

Bottom line on the 2026 docket question

For U.S. Patent 6,952,597 specifically: no PTAB or CAFC 2026 activity located. The patent is expired (adjusted expiration 2022-01-31), which is consistent with it not being asserted in current campaign litigation. The only 2026 Wildseed Mobile activity in the Federal Circuit that my searches surfaced involves U.S. 10,869,169 and the '414 patent family (Google LLC v. Wildseed Mobile, LLC, No. 24-2178; Wildseed Mobile, LLC v. Google LLC, No. 24-1846) — a common-owner but distinct set of patents, which I have not conflated with '597.

I'll research litigation involving US patent 6952597 across patent litigation trackers and court sources.

The initial searches returned mostly noise. Let me target litigation-specific sources.

Findings: Litigation involving US Patent 6,952,597

Bottom line: I could not identify any litigation that asserts US Patent 6,952,597 ("Wireless mobile phone with key stroking based input facilities") as a patent-in-suit.

I searched litigation-focused sources (Unified Patents, PACER-derived dockets via UniCourt/Docket Alarm, CourtListener/RECAP, RPX Insight, and the Stanford NPE Litigation Database, plus the Federal Circuit/Justia docket records). Every result that matched the number "6952597" was either (a) the patent itself, (b) a different patent that merely cites or belongs to the same Wildseed/Varia family (e.g., US 6,944,482; US 7,212,839; US 7,499,731), or (c) unrelated foreign registrations and non-patent uses of the same numeric string (e.g., a Kubota JP patent 6952597, a Lithuanian chess-federation notice number, a Brazilian corporate record). None of those is litigation involving this patent.

I also want to be explicit that I did not auto-correct or substitute similar numbers: results referencing US 6,952,597 were checked against results for other numbers (e.g., 9,031,259; 8,127,984; 8,381,974; 9,405,947; 10,869,169), and I am not conflating them. This patent number (6952597) is distinct from those, and the related-number results are excluded per your instruction.

Why this is plausible (context, not litigation)

Per the record for US 6,952,597:

• Priority/filing date: 2001-01-22; granted/publication date 2005-10-04.
• Legal status: "Expired – Lifetime," adjusted expiration 2022-01-31 (the 20-year term from the 2001 filing, with adjustment). A patent whose term ended in 2022 is a poor candidate for new infringement suits, and its assertion window (roughly 2005–2022) has passed.
• Ownership chain runs Wildseed Ltd. → Wildseed LLC → Varia Mobil/Holdings/Varia LLC → Wildseed Mobile LLC (assignment recorded 2021-08-19), with a security interest recorded to LIT-US CHISUM 21-A, LLC (2021-09-20).

Related-but-distinct litigation by the same patent-owner family (does NOT involve 6952597)

These are set out only so you can see what the owner family has litigated on; none lists US 6,952,597 among its asserted patents:

Note: the 2012 Varia/Samsung-RIM "emoji" reporting did not specify a patent number I could verify as US 6,952,597, and the patent's 2001 filing/mobile-keypad subject matter does not match the emoji-menu description in that coverage. I therefore do not attribute that case to 6952597.

Confidence and caveats

• Confidence that no public litigation asserts 6952597: moderate-to-high, based on the sources searched, but not absolute. No patent-specific litigation tracker page (e.g., a Unified Patents, RPX, or Stanford NPE database entry keyed to "6952597") was returned for this number.
• Recommended confirmatory steps (if you need a court-defensible answer): (1) run a patent-number search directly in Unified Patents' litigation portal (https://portal.unifiedpatents.com/litigation/caselist), the Stanford NPE Litigation Database, and RPX Insight; (2) run a PACER "patent number" search across districts restricted to the 2005–2022 term; (3) query Lex Machina/Docket Navigator by patent number. These are the tools most likely to catch a short-lived or default-judgment case that general web search misses.
• I made no assumption about outcomes for the 2012 case; I could not confirm its termination from the returned records.

In short: no litigation involving US 6952597 was found. The litigation in this owner family (Varia Holdings / Wildseed Mobile) concerns entirely different, later-expiring patents.

PTAB / AIA Trial Proceedings — U.S. Patent No. 6,952,597

Patent: US 6,952,597 B2 — "Wireless mobile phone with key stroking based input facilities"
Applicants/Inventors: Tyrol R. Graham; G. Eric Engstrom
Assignee chain: Gitwit, Inc. → Wildseed Ltd. → Wildseed LLC → Varia Mobil LLC → Varia Holdings LLC → Varia LLC → Varia Holdings LLC → Wildseed Mobile LLC (current); security interest to LIT-US Chisum 21-A, LLC recorded 2021-09-20
Application: 09/767,197, filed 2001-01-22; granted 2005-10-04; expired 2022-01-31 (adjusted expiration; status "Expired – Lifetime")
Claims: 47 total (independents: 1, 21, 41, 42, 43, 46, 47)

---

Proceedings overview

Total AIA trial proceedings on file: 0. The structured "PTAB proceedings on file" block — sourced from the USPTO Open Data Portal, the canonical list for this engagement — returns no IPR, PGR, or CBM proceeding naming U.S. Patent No. 6,952,597. Status breakdown across the (empty) set: active 0 / claims invalidated 0 / claims sustained 0 / settled 0 / institution denied 0.

I independently ran open-web searches to catch anything ODP may not have indexed. Those searches surfaced a cluster of Wildseed Mobile PTAB proceedings — but every one of them is on a different patent, not on the '597. See "Adjacent family activity — do not confuse" below. I found no petition, institution decision, FWD, or appeal touching the '597.

Bottom-line defensive posture: this is not "the patent survived and is hardened," and it is not "the claims are canceled." It is a clean slate — every one of claims 1–47 is untested at the PTAB, and there is no estoppel, no adverse FWD, and no PTAB record to work from. The more consequential fact for a defendant is not PTAB at all: the patent expired on 2022-01-31, capping the damages window and eliminating prospective injunctive exposure. Any demand letter citing ongoing infringement of the '597 is citing a dead patent; any theory must be built entirely on pre-expiration past conduct within 35 U.S.C. § 286's six-year lookback.

---

Per-proceeding detail

No proceedings exist to report. The template is omitted rather than populated with fabricated entries.

Adjacent family activity — do not confuse these with the '597

These appear in searches for "Wildseed" + "IPR" and are sometimes conflated with the '597. They involve different patents, different claims, and different FWDs. None of them estops or binds anyone with respect to U.S. 6,952,597.

Panels in the -00244/-00247/-00248 line were APJs Karl D. Easthom, Michael T. Cygan, and Terrence W. McMillin (per the Ex Parte analytics entry for IPR2023-00247).

The Federal Circuit appeal in the -00247 line is Google LLC v. Wildseed Mobile, LLC, No. 2024-2178 (Fed. Cir. 2026-02-13) (nonprecedential) — vacated and remanded as to claim 15 because the Board addressed only the SMS limitation and was silent on claim 15's disjunctive IM limitation ("the Board's silence on the IM limitation of claim 15 does not meet this requirement"). The companion appeal on the '414 patent, Wildseed Mobile, LLC v. Google LLC, No. 2024-1846, was decided 2026-04-30, with the Federal Circuit rejecting Wildseed's claim-construction and hindsight arguments and upholding the Board's obviousness findings.

• 2024-2178: https://www.courtlistener.com/opinion/[10793148](/patent/10793148)/google-llc-v-wildseed-mobile-llc/
• 2024-1846: https://www.courtlistener.com/opinion/[10851051](/patent/10851051)/wildseed-mobile-llc-v-google-llc/

Why this matters, narrowly: it establishes that (a) Google did mount a five-petition IPR campaign against Wildseed Mobile's asserted portfolio, (b) that campaign was filed 2022-11-30 — one day before the § 315(b) bar in the parallel N.D. Cal. case, Wildseed Mobile, LLC v. Google LLC, No. 3:22-cv-04928 (originally W.D. Tex. 6:22-cv-00357), and (c) the '597 was not one of the five asserted patents (those were the '414, '960, '021, '040, and '169). The plain inference is that the '597 was not asserted in that campaign, presumably because it had already expired.

---

Strategic summary

Claim status. Every claim of the '597 — independent claims 1, 21, 41, 42, 43, 46, 47 and all dependents — is UNTESTED. There are no canceled claims, no sustained claims, and therefore no surviving-claim narrowing to work from. A defendant cannot point to a prior FWD and say "claim 1 is dead." The entire claim set is intact on the face of the patent.

Estoppel landscape. No § 315(e)(2) estoppel exists, because no IPR/PGR was ever instituted against this patent. No petitioner or privy is estopped from raising any ground. For a defendant currently facing assertion:

• The full universe of § 102/§ 103 grounds is available — but note IPR is limited to patents and printed publications (§ 311(b)), and § 112 challenges are unavailable in IPR (they would require a PGR, whose 9-month post-grant window closed in 2006, or a district-court/ITC theory).
• PGR is time-barred (patent granted 2005-10-04).
• CBM is inapplicable — the '597 claims are directed to mobile-phone keypad data entry, not a "financial product or service," so the CBM transitional program was never a fit.
• The § 315(b) one-year clock has not started for anyone, because serving the patent in a complaint is what triggers it — and there is no known assertion of the '597. The corollary caution: if you file a declaratory-judgment action first, § 315(a)(1) bars a later IPR by you.
• The 2021-09-20 security interest in favor of LIT-US Chisum 21-A, LLC and the 2021-08-19 assignment to Wildseed Mobile LLC indicate the patent was swept into a monetization/security package. Even so, no litigation asserting the '597 surfaced in the searches.

Pattern signals. The same petitioner (Google) filed five IPRs against Wildseed Mobile on 2022-11-30 — a coordinated, deadline-driven campaign, not a defensive-aggregator effort. Unified Patents does not appear anywhere in the '597 chain. Wildseed Mobile litigates aggressively (it appealed to the Federal Circuit in both the -00247 and -1846 lines, and prevailed at least partially on claim 15), so a future assertion of the '597 should be assumed to come with willing appellate counsel. But the '597 is a 2001-priority, expired patent on 12-key keypad gesture entry — the paradigm case of an asset that attracts past-damages assertions rather than injunctive campaigns, and that a defendant can attack in district court without PTAB assistance.

---

Recommended next steps

1. Do not budget for an IPR-based defense on the '597. There is no PTAB proceeding to piggyback on, no institution decision to study, no FWD to cite, and — critically — the patent's 2022-01-31 expiration means an IPR filed today would be a costly exercise against a patent with a closed prospective-damages window. If you need PTAB relief, the more plausible targets are the live family members (the '414, '960, '021, '040, '169), and note the Federal Circuit has already gutted most of those claims.
2. Attack damages, not validity, as the first line. Confirm your filing/priority dates and pin the plaintiff to 35 U.S.C. § 286 — recovery can reach back only six years from complaint, and the patent is expired, so there is no ongoing royalty, no injunction, and at most a past-damages claim over a bounded window. Ask for the plaintiff's pre-suit damages contentions before doing any validity work.
3. Validity, if you need it, belongs in district court. With no IPR estoppel, you may run § 102/§ 103 and § 112 (written description, enablement, indefiniteness) grounds — including on the "means ... to interpret key stroking patterns" limitations of claims 1, 21, 41 and 46, which are drafted in § 112(f) form and are prime indefiniteness / corresponding-structure targets. The prosecution history is short (one certificate of correction, 2007-06-05; cited art: Ure US 6,107,997, Smith US 5,982,303, Nokia US 6,310,609, Misawa US 6,295,052, Ericsson WO 97/41677, Tegic US 5,945,928, Ricoh US 6,297,945).
4. Flag the absence of PTAB activity honestly in any opinion you write. It is a real data point: a patent that was in a monetization stack from 2008 through at least 2021 and was swept into a 2021 security interest never attracted a single AIA petition. That is consistent with the patent having been treated as low-value/expired rather than with it being a hardened, reexamined asset.
5. Verify currency before relying on this. ODP ingest lags. My searches reflect results as of 2026-09-27 and found nothing on the '597; if a petition is filed after that date, the § 315(b) clock and the statutory 1-year institution decision deadline under § 314(b) would govern, with the FWD due within 12 months of institution under § 316(a)(11).

---

Confidence and sourcing notes

• High confidence: zero PTAB proceedings on U.S. 6,952,597, per the ODP-sourced block and independent searches. Google Patents record: https://patents.google.com/patent/US6952597/en
• High confidence: patent expired 2022-01-31; 47 claims; independent claims 1, 21, 41, 42, 43, 46, 47.
• High confidence on the adjacent IPR outcomes (patents '021, '040, '960, '169, '414), sourced to the FWDs and the two Federal Circuit opinions linked above — but these are not proceedings on the '597, and I have not represented them as such.
• Cannot confirm: whether any post-grant reexamination (ex parte or inter partes reexam) was ever filed against the '597. The Google Patents "Legal Events" tab shows only assignments, a 2007-06-05 certificate of correction, and fee payments — no reexamination entries — but I did not query the USPTO reexamination database directly. If a reexam exists, it would not be an AIA trial proceeding and therefore would not change the count above, but it could bear on claim scope. Verify via USPTO PatentCenter before relying on this for a validity opinion.

I'll reconstruct the chain from the authoritative fetched record, then cross-check the litigating entities against public NPE/assertion sources.

Let me dig into the litigation-finance entity and the recorded correspondents.

US 6,952,597 B2 — Ownership & Assignment Reconstruction

Patent: Wireless mobile phone with key stroking based input facilities
App. No. 09/767,197 · Filed 2001-01-22 · Issued 2005-10-04 · Priority 2001-01-22
Source of record used: the fetched USPTO assignment abstracts mirrored on the Google Patents "Legal Events" tab for US6952597B2, cross-checked against PTAB/Fed. Cir. filings and third-party NPE databases.

Methodological caveat (read first): The assignment abstracts available in the fetched record expose reel/frame, conveyance, assignor, assignee, execution/effective date and recording date, but not the "correspondent" field. I have therefore not populated any correspondent names for the 13 recorded events — fabricating them would be worse than leaving the field empty. Signal #3 below is scored accordingly and the verification step is specified. Confirm at https://assignmentcenter.uspto.gov/ (search "6952597") or https://assignment.uspto.gov/patent/index.html.

---

Inventors

Unusual patterns — assessment: Not present. The classic red flag (all inventors departing the original assignee within 12 months of filing) does not appear. Engstrom remained with Wildseed Ltd. as CEO for ~4.5 years post-filing and moved to AOL with the company in 2005. The genuinely anomalous item is on the assignment side, not the personnel side: the inventors' assignment was executed 2001-06-14 and recorded 2001-07-16 — roughly five months after the 2001-01-22 filing date. An assignment executed post-filing means the application was filed before the inventors' rights were papered to the company, a common consequence of a fast-moving startup's filing practices (co-pending sibling apps 09/767,526 and 09/767,587 were filed the same day).

---

Original assignee

Gitwit, Incorporated (Washington) — the assignee named on the issued patent, recorded at reel 011983/0477. Gitwit changed its name to WILDSEED LTD. by instrument effective 2002-01-14, recorded 2002-03-29 at reel 012765/0683. So "Gitwit, Inc." and "Wildseed Ltd." are the same legal entity at different points in time; the patent was prosecuted under the Wildseed name.

• Products: Wildseed was a genuine operating company (Kirkland, WA; founded 2000, backed by Ignition Partners and Azure Capital). It shipped the Curitel Identity handset and the SmartSkin interactive faceplate accessories (ringtones, games, video, themes), sold through Dobson Cellular and on the Cingular network, plus a Linux-based mobile OS. Public reporting is clear that the SmartSkin/Curitel products shipped. However, I found no evidence that any Wildseed product practiced the specific claimed feature of this patent (interpreting stroking patterns across touch-sensitive keys to enter alphanumerics). Product-embodiment of these claims is unverified, not established.
• Primary line of business: wireless software / handset accessories and a mobile Linux OS.
• Current status: Acquired and dissolved. AOL (Time Warner) announced the acquisition of Wildseed Ltd. on 2005-08-08 for its "technology and engineers"; CEO Engstrom publicly characterised it as "not a 'fire sale.'" The original assignee entity ceased to exist: Wildseed Ltd. merged into Wildseed LLC (reel 021316/0357, effective 2005-08-08) — the same date as the AOL announcement. Note that the patent portfolio did not travel to AOL; it continued in a separate holding vehicle (below). No bankruptcy of Wildseed appears anywhere in the record.

---

Assignment timeline

All 13 recorded events below are drawn from the USPTO abstracts as mirrored on Google Patents. "Executed" = the effective/execution date carried in the abstract; "Recorded" = the USPTO recording date.

1. Executed 2001-06-14 / Recorded 2001-07-16 — Reel 011983/0477

• Conveyance: Assignment (Assignment of inventors' interest)
• Assignor: Graham, Tyrol R.; Engstrom, G. Eric (individually)
• Assignee: Gitwit, Incorporated (Washington)
• Correspondent: not exposed in the available abstract — verify at Assignment Center
• Context: Original inventor-to-company assignment, executed ~5 months after filing.

2. Executed 2001-10-19 / Recorded 2002-02-04 — Reel 012589/0312

• Conveyance: Security Agreement
• Assignor: Gitwit, Inc.
• Assignee: Silicon Valley Bank (California)
• Correspondent: not exposed — likely lender's counsel; verify
• Context: Venture debt securitisation — SVB takes a security interest in the IP.

3. Executed 2002-01-14 / Recorded 2002-03-29 — Reel 012765/0683

• Conveyance: Change of Name
• Assignor: Gitwit, Inc.
• Assignee: Wildseed Ltd. (Washington)
• Correspondent: not exposed — verify
• Context: Change of name only; no change in ownership or assets.

4. Executed 2004-09-30 / Recorded 2004-10-13 — Reel 015880/0130

• Conveyance: Release (by secured party)
• Assignor: Silicon Valley Bank
• Assignee: Gitwit, Inc.
• Context: SVB releases its security interest; debt extinguished. Not a transfer of title.

5. Executed 2004-09-28 / Recorded 2005-01-03 — Reel 016097/0489

• Conveyance: Security Interest
• Assignor: Wildseed, Ltd.
• Assignee: Venture Lending Leasing IV, Inc. (California)
• Context: Replacement securitisation — new venture lender takes a security interest the month after SVB's release.

6. Executed 2005-08-23 / Recorded 2005-09-16 — Reel 016987/0878

• Conveyance: Release by Secured Party
• Assignor: Venture Lending & Leasing IV, Inc.
• Assignee: Wildseed, Ltd.
• Context: Lender release; encumbrance cleared immediately before/around the AOL transaction.

7. Executed 2005-08-08 / Recorded 2008-07-31 — Reel 021316/0357

• Conveyance: Merger
• Assignor: Wildseed Ltd.
• Assignee: Wildseed LLC (Washington)
• Context: Internal reorganisation coinciding with the AOL deal — operating business to AOL, IP retained in a holding LLC.

8. Executed 2007-08-30 / Recorded 2008-07-31 — Reel 021316/0405

• Conveyance: Assignment of Assignors' Interest
• Assignor: Wildseed LLC
• Assignee: Varia Mobil LLC (Washington)
• Context: Transfer of the retained IP out of the Wildseed-named entity into a new "Varia" vehicle.

9. Executed 2008-06-24 / Recorded 2008-07-31 — Reel 021316/0437

• Conveyance: Change of Name
• Assignor: Varia Mobil LLC
• Assignee: Varia Holdings LLC (Washington)
• Context: Change of name only.

10. Executed 2008-07-02 / Recorded 2008-07-31 — Reel 021316/0442

• Conveyance: Assignment of Assignors' Interest
• Assignor: Varia Holdings LLC
• Assignee: Varia LLC (Washington)
• Context: Transfer to a sibling "Varia" entity — mirror-image movement to event 11.

11. Executed 2009-12-29 / Recorded 2010-02-15 — Reel 023928/0756

• Conveyance: Assignment of Assignors' Interest
• Assignor: Varia LLC
• Assignee: Varia Holdings LLC (New York)
• Correspondent: not exposed — verify; note the assignee address state changed WA → NY
• Context: Title moves back to a Varia Holdings LLC, now recorded at a New York address. Net effect of events 10–11: a round-trip through two same-named affiliates in <24 months.

12. Executed 2021-08-19 / Recorded 2021-08-19 — Reel 057228/0772

• Conveyance: Assignment of Assignors' Interest
• Assignor: Varia Holdings LLC (New York)
• Assignee: Wildseed Mobile LLC (New York)
• Correspondent: not exposed — verify; this is the single most informative correspondent entry on the chain
• Context: Transfer to the asserting NPE. Same-day execution and recording; the assignee revives the defunct Wildseed brand name. Per the litigation record the operating entity is a Texas LLC with a stated place of business at 510 Austin Avenue, Waco, TX 76701 — note the mismatch between the New York address in the assignment record and the Texas organisation claimed in the complaint. Occurs ~3.5 months before the first suit.

13. Executed 2020-09-17 / Recorded 2021-09-20 — Reel 057535/0783

• Conveyance: Security Interest
• Assignor: Wildseed Mobile LLC
• Assignee: LIT-US CHISUM 21-A, LLC (New York)
• Context: Third-party security interest granted over the portfolio in favour of a financing vehicle, recorded 11 days after the assignment at reel 057228/0772. The stated effective date (2020-09-17) precedes the recorded assignment to Wildseed Mobile LLC and is recorded ~1 year later — consistent with a collateral/funding arrangement whose effective date runs from an earlier commitment, and worth confirming against the underlying instrument.

Also of record on the face of the patent (not a title transfer): a Certificate of Correction entered 2007-06-05, and the statutory term end at 2022-01-31 (20 years from the 2001-01-22 filing plus PTA). Legal status "Expired – Lifetime"; the 12-year maintenance fee was paid 2017-10-02 with a late-payment surcharge (reel-level event M1556/M1553), so the expiry is natural term end, not a fee lapse.

---

Timeline diagram

timeline
    title Ownership of US 6952597
    2001 : Graham and Engstrom assign to Gitwit Inc
         : Silicon Valley Bank security interest
    2002 : Gitwit renamed Wildseed Ltd
    2004 : SVB releases security interest
    2005 : Venture Lending security interest
         : Release by secured party
         : Wildseed Ltd merges into Wildseed LLC
    2007 : Wildseed LLC assigned to Varia Mobil LLC
    2008 : Renamed Varia Holdings LLC
         : Assigned onward to Varia LLC
    2009 : Reassigned back to Varia Holdings LLC
    2021 : Assigned to Wildseed Mobile LLC
         : LIT US Chisum security interest
         : Portfolio suit filed against Google

---

NPE / troll-pattern signals

1. Shell-entity transfer — PRESENT.
The title leaves an operating company and lands in an entity whose only function on the record is holding and asserting: reel 057228/0772 (executed/recorded 2021-08-19) transfers the patent from Varia Holdings LLC to Wildseed Mobile LLC, which took the name of the operating company that had been sold to AOL and dissolved 16 years earlier. The entity is a single-purpose LLC; per its own First Amended Complaint in Wildseed Mobile LLC v. Google LLC (W.D. Tex. 6:21-cv-01245, filed 2021-12-01, ¶2) it is "a domestic limited-liability company organized under the laws of the State of Texas with a place of business at 510 Austin Avenue, Waco, TX 76701" — a nominal litigation address, not a manufacturing or engineering site. I have found no products sold by Wildseed Mobile LLC. Note the secondary tell: the assignment record captures the assignee at a New York address (event 12) while the litigating affiliate claims Texas organisation.

2. Known asserter in the chain — PRESENT (by third-party NPE catalogues, not by the enumerated roster).
No assignee in this chain matches Acacia, Marathon, Intellectual Ventures, IPNav, Wi-LAN, Mosaid/Conversant, Vringo, Pendrell, Innovatio, MPHJ, Lumen View, Round Rock, Document Generation Corp, or a Spangenberg entity. But the current owner is independently catalogued as a patent asserter: Wildseed Mobile LLC v. Google LLC et al., 3:22-cv-04928 (N.D. Cal.) appears in the Stanford NPE Litigation Database under the asserter category "Acquired patents" (npe.law.stanford.edu). Law360 has described the plaintiff as "a litigation outfit targeting the way that ads work on YouTube" (30 May 2024). A sister entity on this very chain, Varia Holdings LLC, is also an active filer — it sued Apple on three portfolio RFID patents on 2023-10-05 (Varia Holdings LLC v. Apple Inc., 1:23-cv-07477, E.D.N.Y.) and defended three Apple IPRs (IPR2024-01362/-01363/-01364). Both the assignor and the assignee of event 12 are practised asserters, not one or the other.

3. Repeat correspondent across the chain — UNCLEAR / NOT DETERMINABLE.
The fetched assignment abstracts do not carry the correspondent field, so I will not assert recurrence. The verification step is concrete: pull reels 011983/0477, 012589/0312, 012765/0683, 015880/0130, 016097/0489, 016987/0878, 021316/0357-0442, 023928/0756, 057228/0772 and 057535/0783 from Assignment Center and compare the recorded correspondent on the six "Varia/Wildseed Mobile" links (events 8–13) — if one attorney or firm filed events 8–13, that is a textbook repeat-player finding here. What is documented is a litigation-side repeat player (which is a different, weaker tell and does not substitute): Kramer Alberti Lim & Tonkovich LLP — David Alberti, Sal Lim, Robert F. Kramer, Zachariah A. Higgins — appear for Wildseed Mobile across the parallel IPRs and at the Federal Circuit (IPR2023-00245/00246/00247; Fed. Cir. 24-2178), with Sterne Kessler Goldstein & Fox (R. Bemben, R. Crudo, J. Fitzsimmons, S. Pappas, M. Specht) alongside. Those are assertion counsel, not assignment correspondents; I flag them as context only.

4. Cascading transfers — PRESENT.
Six title/name events in the Varia family in a compressed window: four conveyances all recorded on the same day, 2008-07-31 under a single reel (021316, frames 0357, 0405, 0437, 0442) — merger, two assignments and a name change — followed by a further assignment recorded 2010-02-15 at reel 023928/0756. The entity name churns Wildseed LLC → Varia Mobil LLC → Varia Holdings LLC → Varia LLC → back to Varia Holdings LLC within ~2.5 years, and the final two steps (events 10 and 11) are effectively a round-trip through same-surname affiliates. Characterisation: this reads as internal reorganisation / tax or holding-structure housekeeping (all events sit inside one corporate family with no third-party consideration on the face of the record), not a rapid flip between unrelated purchasers. The signal is present but is the weaker of the two "present" structural findings.

5. Pre-litigation transfer — PRESENT (strongest signal).
The patent was assigned to the asserting entity at reel 057228/0772 on 2021-08-19, and the first infringement complaint against Google was filed 2021-12-01 (Wildseed Mobile LLC v. Google LLC, W.D. Tex. 6:21-cv-01245) — ~3.5 months, well inside the 6-month window. The chain was plainly arranged to put clean title in the plaintiff immediately before filing, and the venue was then engineered toward the Western District of Texas (the suit was filed in Waco, voluntarily dismissed and refiled 2022-04-04, then transferred to N.D. Cal. in Aug 2022). The security interest at reel 057535/0783 (Wildseed Mobile LLC → LIT-US CHISUM 21-A, LLC) is recorded 11 days after the assignment, evidencing third-party financing layered onto the assertion vehicle.

6. Bankruptcy fire-sale — NOT PRESENT.
No Chapter 7 or Chapter 11 of the original assignee appears in the record. The original assignee was sold as a going concern to AOL (announced 2005-08-08) and its CEO expressly denied a fire-sale characterisation. However, note the IP carve-out: the Wildseed Ltd. → Wildseed LLC merger (reel 021316/0357) is effective the same day as the AOL announcement, and the patents stayed behind in the holding vehicle rather than passing to AOL. That is a portfolio-retention structure, not a bankruptcy sale.

7. Privateering — NOT PRESENT (no evidence).
Nothing in the record, in SEC-reportable coverage of the AOL/Time Warner transaction, or in the litigation filings indicates that AOL (or any later operating company) directed or shared in Wildseed Mobile LLC's 2021–2022 assertions. The 2005 IP carve-out is consistent with a future-monetisation plan, but consistency is not evidence; I decline to score this present.

8. Defensive aggregator (anti-NPE) — NOT PRESENT.
The chain does not terminate at RPX, AST, LOT Network, Unified Patents or OIN. It terminates at Wildseed Mobile LLC, which is currently adverse to Google in district court and before the PTAB. The patent is not neutralised.

---

Verdict

NPE — high confidence.

The chain's terminal assignee is a single-purpose asserting entity acquired specifically to litigate: reel 057228/0772 (executed and recorded 2021-08-19) moved the patent from Varia Holdings LLC to Wildseed Mobile LLC, and the first complaint followed ~3.5 months later on 2021-12-01 — a textbook pre-litigation transfer (Signal 5), corroborated by a third-party security interest over the portfolio recorded 11 days later at reel 057535/0783 to LIT-US CHISUM 21-A, LLC. That entity sells no products and operates from a nominal Waco, Texas litigation address (Signal 1), and the same owner is catalogued as an acquired-patents asserter in the Stanford NPE Litigation Database, with its sister entity Varia Holdings LLC separately suing Apple in E.D.N.Y. in 2023 (Signal 2). The 2005–2010 Varia entity churn (ramp; reels 021316/0357–0442, 023928/0756) supports the pattern but reads as internal reorganisation rather than third-party flipping (Signal 4, weaker). Two caveats for the file: (a) Signal 3 (repeat assignment correspondent) could not be scored because the correspondent field is not in the fetched abstracts — pull it from Assignment Center before relying on a repeat-player theory; and (b) I found no infringement suit naming US 6,952,597 itself — the asserted Wildseed Mobile patents are US 7,376,414, 9,141,960, 10,251,021, 10,959,040 and 10,869,169, which are the advertising/hot-link branch of the same acquired portfolio. The NPE verdict therefore attaches to the ownership chain and terminal owner, not to proven assertion of this specific patent.

Verify: USPTO Assignment Center — https://assignmentcenter.uspto.gov/ (search patent number 6952597) · alternate index: https://assignment.uspto.gov/patent/index.html · Google Patents legal events: https://patents.google.com/patent/US6952597/en

I'll research this patent's prior-art citations. Let me start by verifying the patent and its cited references.

Let me gather details on the remaining cited references.

Let me get details on the remaining citations.

Prior-Art Analysis — U.S. Patent No. 6,952,597

0. Patent Identification (verified, not auto-corrected)

Critical date for § 102 analysis: 2001-01-22. Any reference printed/published more than one year before that date is § 102(b) art; any U.S. patent granted on an application filed before that date (but published later) is § 102(e) art.

Because claims 1 and 41 recite "means coupled to the input keypad to interpret…," they are means-plus-function claims and must be construed under 35 U.S.C. § 112(f) against the corresponding structure in the spec (the "complementary logic 330" hosted in non-volatile memory 306, FIG. 3). This materially enlarges the equivalents that a § 102/§ 103 reference must disclose.

Caveat on scope of this report: Anticipation under § 102 requires a single reference disclosing every limitation. Most of the seven references below are better characterized as § 103 (obviousness) or background art; I flag where a reference is a genuine § 102 candidate versus merely a § 103/background reference. I am not offering legal conclusions.

---

1. The Seven References Cited on the Face of US 6,952,597

Note: The reference "US 5,982,303" is Jeffrey Smith (Method for entering alpha-numeric data). It should not be confused with US 5,982,302, a different patent by Ure (Touch-sensitive keyboard/mouse). The patent's citation table lists only US 5,982,303 (Smith).

---

2. Per-Reference Detail & Claim Mapping

Reference 1 — US 6,295,052 B1 (Misawa Homes / Kato) — most likely § 102 candidate for the "soft key / touch-pad" claims

• Full citation: Screen display key input unit, US 6,295,052 B1; inventors Yoshiya Kato and Syunji Kato; assignee Misawa Homes Co., Ltd. (Tokyo, JP); US App. 09/101,799; PCT filed 1997-02-18; PCT Pub. WO 97/30386 (1997-08-21); JP priority 1996-02-19; granted 2001-09-25.
• URL: https://patents.google.com/patent/[US6295052B1](/patent/US6295052B1)
• Brief description: A screen-display key input unit in which each on-screen key can carry two graphic character codes, and the unit decides which code to output based on whether the touch-sensitive input (pen/finger) shifts over a predetermined length while continually touching the key area (a "stroke") versus a short touch. Also distinguishes codes by touch duration, pressure, button state, drag, and number of actuations. 26 alphabet letters can be defined on 13 keys.
• Potential § 102 relevance:
  • Claims 1, 21, 40 (touch-sensitive keys / touch pad logically partitioned into regions; interpretation of a shift over a distance on a key to generate a character) — possible anticipation of the concept of "stroking" a soft key to enter a character, but not a clean anticipation because (a) the movement is within one key area, not "stroking of two or more adjacent… keys" as claim 1 requires, and (b) the device is not a "wireless mobile phone."
  • Claim 20 / 40 (keypad is a touch pad; keys are logically partitioned regions) — strong § 103 reference, arguably § 102 for the partitioned-region element alone.
  • Assessment: § 102 candidate for the touch-pad/logical-region concept (claims 20/40) and a § 103 cornerstone for claim 1; not a standalone anticipation of claims 1/21/41.

Reference 2 — WO 97/41677 A1 (Ericsson) — § 103 / background

• Full citation: Tactile keypad for touch sensitive screen, WO 97/41677 A1 (PCT); applicant Ericsson Inc.; priority 1996-04-03; published 1997-11-06.
• URL: https://patents.google.com/patent/WO1997041677A1/en
• Brief description: A cellular telephone with a touch-sensitive LCD panel and a movable cover carrying a premolded rubber keypad; key depression causes the key's underside to contact the touch screen (tactile feedback). Backlight/LEDs illuminate keys. Explicitly contemplates photodiodes/LEDs "to pass through the keys."
• Potential § 102 relevance:
  • Claim 1 / 2 / 41 (a wireless mobile phone with touch-sensitive keys): discloses the phone-plus-touch-key environment, so it anticipates the "touch-sensitive keys in a wireless mobile phone" sub-elements, but it does not disclose interpreting key stroking patterns to enter alphanumeric data → not an anticipation of claims 1/21; useful as § 103 base reference.

Reference 3 — US 6,107,997 A (Ure) — § 103 cornerstone, arguable § 102 for touch-pad claims

• Full citation: Touch-sensitive keyboard/mouse and computing device using the same, US 6,107,997 A; inventor Michael J. Ure; filed 1996-06-27; granted 2000-08-22.
• URL: https://patents.google.com/patent/[US6107997A](/patent/US6107997A)/en
• Brief description: A touch-sensitive pad that emulates a keyboard and mouse. Characters are entered by "chord keying" — touching different touch patterns (multiple simultaneous touches) of a cross-hair-partitioned pad, each pattern mapped to a character; also shows a virtual telephone keypad with three letters per key. Detects finger/thumb positions, movements, and gestures.
• Potential § 102 relevance:
  • Claims 1, 20, 21, 40 — Ure discloses a touch-sensitive pad logically divided into areas, with touch patterns → alphanumeric data, which reads on the "soft key / logically partitioned regions" concept. However, Ure's patterns are simultaneous chords, not a stroke/glide across two or more adjacent keys, so it does not fully anticipate claim 1; and Ure's device is a computing device, not a wireless mobile phone. → § 103 reference; strongest for claims 20/40 and as an obviousness base for the "touch pattern → character" concept.
  • Note the statutory gap: because US 6,107,997 published 2000-08-22 (less than one year before 2001-01-22), it is not § 102(b) art on its U.S. publication; it qualifies as § 102(e) art via its 1996-06-27 filing.

Reference 4 — US 5,982,303 A (Smith) — closest § 102 candidate for the method and directional claims

• Full citation: Method for entering alpha-numeric data, US 5,982,303 A; inventor Jeffrey Smith; priority 1997-02-03; granted 1999-11-09.
• URL: https://patents.google.com/patent/US5982303
• Brief description: Alpha-numeric entry by two-stroke "pictographs" over an array of eight actuation points: each character is defined by a sequential actuation of no more than two actuation points, and the two strokes (from a key → center → another key) form a pictograph resembling the character. The eight points may be arranged radially as compass points (N, NE, E…); the device may be a telephone keypad, joystick, or touch screen, and the pictographs are formed "from top to bottom" or "left to right."
• Potential § 102 relevance:
  • Claim 21 (method) and directional claims 24–39 / pattern claims 4–19 — Smith discloses entering alphanumeric data by sequential strokes spanning two keys of a key array, with defined directions (compass layout; top-to-bottom, left-to-right conventions). This is the strongest § 102 candidate for the directional stroke concepts in claims 4–19/24–39 and for the general "stroke pattern → character" method of claim 21.
  • Key gap: Smith's strokes run key→center→key and the "device" is not a "wireless mobile phone" (though claim 6 of Smith covers a "telephone keypad"). Under a strict reading of the "wireless mobile phone" preamble and the "two or more adjacent keys" limitation, Smith is better as a § 103 reference for claims 1/21 and as a § 102 reference for the purely directional/pictograph sub-claims.

Reference 5 — US 6,310,609 B1 (Nokia) — § 102 candidate for the "LED/guide-light" claims

• Full citation: User interface with guide lights, US 6,310,609 B1; assignee Nokia Mobile Phones Limited; priority 1997-04-17; granted 2001-10-30.
• URL: https://patents.google.com/patent/[US6310609B1](/patent/US6310609B1)
• Brief description: A wireless-device user interface in which keys are provided with guide lights (light guides/illuminating elements) that are selectively lit to guide/feedback the user's key selection.
• Potential § 102 relevance:
  • Claims 41, 42, 47 — these claims require physical touch-sensitive keys each having one or more LEDs, with the LEDs lit to visually echo the key stroking pattern. Nokia '609 discloses illuminated keys in a mobile user interface and is the natural § 102/§ 103 reference for the "illuminate the touched key" element (the spec's "LEDs of the keys being stroked are lit"). Anticipation of claims 41/42/47 requires the reference to also disclose interpreting a stroking pattern (which Nokia '609 does not clearly do) → strong § 103 reference; partial § 102 for the illumination element.
  • Confidence note: I was unable to open Nokia '609's full specification within my search budget; the description above rests on its citation listing plus title. Treat the claim mapping as provisional.

Reference 6 — US 5,945,928 A (Tegic) — § 103 / background

• Full citation: Reduced keyboard disambiguating system for the Korean language, US 5,945,928 A; assignee Tegic Communication, Inc.; priority 1998-01-20; granted 1999-08-31.
• URL: https://patents.google.com/patent/[US5945928A](/patent/US5945928A)
• Brief description: A reduced-keyboard disambiguation system (T9-style) that maps ambiguous multi-key keystroke sequences to words/characters via vocabulary modules — i.e., alphanumeric entry on a 12-key phone keypad by sequential key actuation.
• Potential § 102 relevance:
  • Relevant to the background problem the '597 patent recites ("well-timed pressing of the 'numeric' keys… cumbersome"), so it is § 103/background context for claims 1/21 (alphanumeric entry on a phone keypad). It does not disclose stroking/gliding across adjacent touch-sensitive keys, so it does not anticipate any claim.

Reference 7 — US 6,297,945 B1 (Ricoh) — § 103 / background

• Full citation: Portable electronic terminal apparatus having a plurality of displays, US 6,297,945 B1; assignee Ricoh Company, Ltd.; priority 1999-03-29; granted 2001-10-02.
• URL: https://patents.google.com/patent/[US6297945B1](/patent/US6297945B1)
• Brief description: A portable electronic terminal with multiple display panels (e.g., a main display plus an auxiliary display window).
• Potential § 102 relevance:
  • At most background for the display/echo claims 3 and 23 ("echo on said display"). It discloses multiple-display terminals but not stroking-based entry, so it does not anticipate any claim. Confidence note: full text not retrieved within search budget.

---

3. Summary Judgment — Anticipation vs. Obviousness

Key takeaways for the record

1. All seven cited references qualify as prior art to the 2001-01-22 critical date — references 1–4 and 6 as § 102(b)/(e) art via publications or filings well before the critical date; references 5 and 7 as § 102(e) art (they published after the '597 filing but were filed before it).
2. No single cited reference appears to disclose every element of independent claim 1 or 21. The "wireless mobile phone" preamble combined with "stroking of two or more adjacent touch-sensitive keys" appears to be the point of novelty that the cited art does not cleanly meet.
3. The strongest substantive threat is a § 103 combination of US 5,982,303 (Smith) — which teaches two-stroke directional key patterns for alpha-numeric entry — with WO 97/41677 (Ericsson) (touch-sensitive keys in a wireless mobile phone) and/or US 6,107,997 (Ure) or US 6,295,052 (Misawa) (partitioned touch-sensitive key areas).
4. Claims 43–45 (stroking patterns tied to ancillary functions such as directory, calendar, email, and web browsing) and 41/42/47 (LED echo) are the claims most exposed to the cited art, since the "ancillary function" and "illuminated key" elements were known in the art (cf. Nokia '609's guide lights).
5. I could not retrieve the full specifications of US 6,310,609, US 5,945,928, and US 6,297,945 within my search budget; their mappings above are provisional and rest on the '597 patent's own citation table, titles, and dates. All other descriptions were verified against the references' full text on Google Patents / FreePatentsOnline.

This is a technical prior-art mapping, not a legal opinion on validity or infringement.

I'll ground this §103 analysis in the actual cited references. Let me pull the content of the face-of-patent prior art.

Now let me retrieve the remaining cited references — especially the Nokia "guide lights" reference, which matters for the LED claims.

Obviousness Analysis — U.S. Patent 6,952,597 B2

Patent: US 6,952,597 B2, "Wireless mobile phone with key stroking based input facilities"
Priority/filing: 2001-01-22 | Granted: 2005-10-04 | Priority art cutoff for §102(b): 1999-01-22 (and 1998-01-22 for §102(b) one-year bar on the application itself)
Statutory basis: 35 U.S.C. § 103(a)
Art base used: the seven references cited on the face of the patent (the "Prior Art" section of the patent page), per your instruction, supplemented where noted.

---

0. Source and confidence caveats (read first)

Three things must be flagged before the analysis:

1. The prior-art set analyzed here is the face-of-patent citation set only. All seven references were cited/considered by the Examiner during prosecution, and the '597 claims issued over them. That is a meaningful, though non-dispositive, evidentiary signal against a §103 case built solely on this set. See §8.
2. Full-text retrieval in this session was successful for five references (US 5,982,303; US 6,107,997; US 6,295,052; US 6,310,609; WO 97/41677). Two references — US 6,297,945 (Ricoh, multiple displays) and US 5,945,928 (Tegic, reduced keyboard disambiguation, Korean) — could not be re-retrieved in this session (retrieval budget exhausted). Their characterization below is based on title, assignee, and the standard disclosure of those families, and is expressly marked UNVERIFIED where it matters. Do not rely on those characterizations without pulling the documents.
3. Later art is not usable. The "Cited By" list on the patent page includes Microsoft Gesture-Based Character Input (US 7,849,233, filed 2005-05-31) and the Nuance/Sharan Data entry system and method of entering data family (filed 2006-06-19) — these are post-priority and cannot be §102/§103 prior art against a 2001 priority date. I have excluded them. (They are, however, relevant to the scope of what the art considered to be the inventive concept, and to any § 101/obviousness-type-double-patenting discussion in later litigation.)

---

1. Governing framework

• Graham v. John Deere Co., 383 U.S. 1 (1966): scope and content of prior art; differences; level of ordinary skill; secondary considerations.
• KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007): a combination is obvious where a POSA had a reason to combine known elements "with a reasonable expectation of success"; the "predictable use of prior art elements according to their established functions." A "mere aggregation" is not required to be bodily incorporable — "a patent composed of several elements is not proved obvious merely by demonstrating that each of its elements was, independently, known in the prior art"; conversely, "if a technique has been used to improve one device, and a person of ordinary skill in the art would recognize that it would improve similar devices in the same way, using the technique is obvious."
• In re Merck & Co., 800 F.2d 1091, 1097 (Fed. Cir. 1986): nonobviousness cannot be established by attacking references individually where the rejection rests on a combination.
• MPF claims. Claims 1, 21, 41 and 46 recite "means coupled to the input keypad to interpret key stroking patterns…" This is presumed § 112(f) means-plus-function. Under Williamson v. Citrix, 792 F.3d 1339 (Fed. Cir. 2015) (en banc), absent sufficient structure the "means" term is construed to cover the disclosed algorithm and equivalents. For '597, the corresponding structure is complementary logic 330 in non-volatile memory 306 executed by micro-controller 302, performing the FIG. 2 flow (blocks 202/204/206/208, plus the optional conjunction test). Any §103 analysis must therefore map prior art onto that algorithm, not merely onto "software that does this."

---

2. Level of ordinary skill in the art (POSA)

A POSA as of January 2001 would have: (a) a bachelor's degree in EE/CS, or equivalent, plus 2–4 years in mobile handset or handheld-input design; (b) working familiarity with (i) the 12-key telephone keypad and multi-tap/T9 text entry, (ii) touch-sensitive pads/screens and capacitive sensing, (iii) keypad backlighting/LED drive, (iv) the mobile-phone HMI and menu hierarchy. Notably, the '597 specification itself concedes the POSA's baseline knowledge — the FIG. 3 architecture (micro-controller 302, DSP 304, non-volatile memory 306, GPIO 308, TX/RX 312 supporting "CDMA, TDMA, GSM") is expressly described as conventional: "Except for the use of non-volatile memory 306 to host complementary logic 330, the elements are used to perform their conventional functions known in the art." This self-admission is a significant evidentiary asset to any challenger.

---

3. Claim-construction points that drive the §103 outcome

Three constructions do most of the work:

Drafting anomalies to note (validity-relevant, not §103):

• Claim 46 closes with "wherein at least one of said first and second stroking patterns is composed of…" — "said first and second stroking patterns" has no antecedent basis in claim 46. Under Energizer Holdings v. ITC, 435 F.3d 1366 (Fed. Cir. 2006) (the "said" language is an antecedent-basis requirement), this is at minimum a § 112(b) indefiniteness exposure.
• Claim 43 already recites a first and second operation on the same ancillary function; claim 44 then adds a second operation on a second ancillary function. The two overlap confusingly — again § 112(b) territory.
• Claim 15 is mis-numbered in the printed text as "The wireless of keys of claim 1" — purely typographical (a Certificate of Correction issued 2007-06-05, which may or may not have addressed it).

---

4. Reference-by-reference disclosure map

Quotations are from the full texts retrieved in this session.

4.1 US 5,982,303 — Smith, "Method for entering alpha-numeric data" (Nov. 9, 1999)

The closest reference on "directional strokes over an ordered key array define characters."

• Eight-key keypad arranged radially ("the keys 1 are arranged radially about the center point 4 at approximately 45 degree intervals"); express statement that "a variety of apparatus can be used… including, for example, a touch tone telephone, a hand-held remote control… or a touch screen."
• Characters are defined by two-stroke "pictographs": "a first stroke 3 begins at starting point 2… and ends at center point 4… a second stroke 5 begins at center point 4 and ends at ending point 6." "The resultant pictograph resembles the letter 'A', and requires only two keystrokes."
• Direction conventions are expressly claimed/described: "all the characters are formed from top to bottom of the figure unless both the starting point and ending point are in the same row, in which case the direction is from left to right." FIG. 4 characters "take the opposite direction… i.e., from bottom to top or right to left."
• Claim 6: "the data entry device is a telephone keypad, and the eight actuation points comprise keys 1,2,3,4,6,7,8, and 9 on the telephone keypad."
• Claim 15 (apparatus): "A data entry device, comprising an array of eight actuation points… defining an alphanumeric data set as a function of a sequential actuation of the actuation points… each character being defined by a sequential activation of no more than two actuation points, wherein said actuation points defining each character forming a corresponding pictograph."

Gap: Smith's strokes are discrete sequential key actuations, not a continuous glide, and its strokes are two-key (start→center, center→end) rather than multi-key spans. Smith therefore does not alone meet the "stroking of two or more adjacent keys" glide limitation. It supplies the directional-primitive vocabulary and the mobile-keypad environment.

4.2 US 6,295,052 B1 — Kato/Kato, Misawa Homes, "Screen display key input unit" (Sep. 25, 2001; PCT filed 1997-02-18; JP priority 1996-02-19)

The closest reference on "direction of a continuous touch stroke selects among characters on a key." This is arguably the single most dangerous reference in the set.

• Keys displayed on screen, "each of the keys are defined with first and second graphic character codes"; a criterion means "decid[es] whether the touch-sensitive input means shifts over a predetermined length with continuous touch to the key areas." "Irrespective of movement direction thereof" (claim 1), the second code is output when the moving distance exceeds the threshold.
• Direction is explicitly discriminated into four classes. FIG. 14: point touch; "bar touch in the horizontal direction"; "when the more than four pixels are continuously touched from the upper right to the lower left… bar touch in a downward diagonal direction to the left"; "from the upper left to the lower right… bar touch in a downward diagonal direction to the right."
• Effects passage: "the input is determined as the bar touch input insofar as the more than four pixels 76 are touched even when the pen 15 is moved in the vertical direction, in a slanting direction or along a shape 'V' or inverted V."
• Claim 5: "said touch-sensitive input means is touch screen input means for touching the respective key area shown on the screen with fingers." Claim 2: the alternative criterion is duration of continuous touch. Claim 3: an external push-button modifies the output.
• Feedback: "the key is displayed in reverse when being touched, thereby it is easy to confirm which of the keys is touched."
• Related Kato family (not on the '597 face, but same examiner-family and same disclosure lineage): US 6,356,258 B1 ("Keypad," Mar. 12, 2002) and the Kato continuation US 2006/0007162 A1, "Touch-type key input apparatus," whose abstract recites "judging a moving direction in touch press inputting" and "selecting and outputting the characters displayed in the moving direction."

What Misawa/Kato supplies for '597:

• Touch-sensitive "keys" (soft keys) — the spec.'s own alternative embodiment (§ claims 20/40).
• Continuous-touch stroke across the keypad surface.
• Objective direction of the stroke as the discriminating variable: horizontal (right/left), and both top-to-bottom diagonals.
• Sub-dividing a key into quarter-areas and outputting different character codes based on which quarter the stroke traverses — this is functionally a two-or-more-region stroke primitive.
• Visual feedback of the touched key ("displayed in reverse").

Gap: Misawa/Kato's strokes are largely in-key bar touches with a table lookup, not necessarily a span of multiple adjacent keys; and the strokes are on a PDA/PC screen, not a mobile phone.

4.3 US 6,107,997 — Ure, "Touch-sensitive keyboard/mouse and computing device using the same" (Aug. 22, 2000; filed 1996-06-27)

• "the function of a keyboard may be realized using 'chord keying,' i.e., forming different touch patterns on the touch-sensitive pad." "A cross-hair pattern identifies nine separate touch areas, such that 36 unique two-touch (thumb and forefinger or middle finger) touch patterns may be formed." A "virtual keypad like that of a telephone is represented, with typically three letters assigned to each key."
• Claims 4, 8–11: touching different combinations of fingers to a touch-sensitive member to "represent different characters"; "sensing a combination of fingers touched to the touch-sensitive member; and… producing a binary representation of respective ones of said different characters."
• Claim 3: "touching different numbers of fingers"; claim 7: "different numbers and combinations of fingers."
• Claim 21: "within at least one of said plurality of areas, moving a finger across the touch-sensitive pad; detecting lateral movement of the finger; and inputting positional information."
• Claim 6: areas "arrayed in an array of four rows and three columns," bearing images "QZ ABC DEF / 1 2 3 / GHI JKL MNO / 4 5 6 / PRS TUV WXY / 7 8 9 / Oper * 0 #."
• Claim 19/20: "the touch-sensitive pad forms an upper surface of a mechanical key"; "the information is input only when the mechanical key is actuated."
• Claim 16: "a plurality of characters are indicated on the touch-sensitive pad, each… having a position indicating one of a area, a line and an intersection to be touched by one of the digits."
• Claim 18: "the information is a command."
• Same inventor's sibling US 5,982,302 ("Touch-sensitive keyboard/mouse," filed 1994-03-07) uses the phrase "resembles a stroking of the touch-sensitive member."

What Ure supplies: a touch-sensitive keypad (both freeform and physical-key overlay) on which gestures/touch patterns across areas map to characters and commands, with binary character representations as output, and with lateral finger movement across areas detected. It is directly on point for the "means… interpret… to facilitate entry of alphanumeric data or commands" element of claims 1/21/46, and for the touch-pad variant of claims 20/40.

4.4 WO 97/41677 A1 — Ericsson, "Tactile keypad for touch sensitive screen" (Nov. 6, 1997)

• Expressly directed to "telecommunication instrument… Examples of such instruments include cellular telephones and radios, pagers, personal-digital-assistant (PDA) and pen-input notebooks."
• "a plurality of keys are mounted in the cover panel and are arranged so that they are aligned with predesignated areas of the touch sensitive screen… Each of the keys are movable… between a first position at which the key is spaced a predetermined position from the touch sensitive screen and a second position at which the key is in touching contact with a respective one of the predesignated areas of the touch sensitive screen."
• Motivations stated: "A major disadvantage of such touch sensitive screens is the lack of positive tactile feedback to the operator… the present invention is directed to overcoming the problems set forth above."

What WO 97/41677 supplies: a cellular telephone having a touch-sensitive screen logically partitioned into predesignated areas acting as keys, overlaid by physical keys. This is a near-verbatim anticipation of the structural environment of claims 1/20/21/40/41/42 (physical keys + touch-sensitive key-region sensing) in a mobile telephony context.

4.5 US 6,310,609 B1 — Morgenthaler, Nokia, "User interface with guide lights" (Oct. 30, 2001; filed Apr. 17, 1997)

The LED reference.

• "a mobile telephone… keypad having a plurality of keys… a plurality of illumination sources, wherein at least one illumination source… corresponds to each key… a means for independently controlling activation of said plurality of illumination sources to identify one or more of said plurality of keys."
• Claim 2: "each key is at least partially light transmissive and at least one illumination source is disposed beneath its corresponding said each key." Claim 4: LED "disposed within said each key." Claim 11: "each light source… comprises a light emitting diode."
• Claim 15 (method): "selectively illuminating at least one of said illumination sources of said keys within said keypad to indicate said at least one keystroke."
• FIG. 2 / specification: indexing key 216 has two light sources 218 and 219 "to indicate that it may be pressed in the up direction… or in the down direction." And: "When the user reaches the upper end of the menu, the upper light source is no longer illuminated, and when the user reaches the lower end of the menu, the lower light source is no longer illuminated" — i.e., directional, position-dependent, selective LED illumination driven by the user's interaction state.

What Nokia supplies for claims 41/42/47: physical mobile-phone keys, each with one or more LEDs, independently and selectively illuminated by the processor in response to a user's interaction with the keypad, including up/down directional illumination. The only difference from '597's claims 41/42/47 is what the illumination signifies — '597 says "visually echo the key stroking patterns being imparted"; Nokia says "guide the user to the next key." Both are "illuminate the keys the user is interacting with, as feedback about that interaction." That is a difference in the information content of a known output channel, not in structure or in the mechanism — precisely the kind of difference KSR treats as an obvious design choice. (See §6.4.)

4.6 US 6,297,945 B1 — Ricoh, "Portable electronic terminal apparatus having a plurality of displays" (Oct. 2, 2001) — UNVERIFIED in this session

Per title/assignee and the standard disclosure of the Ricoh portable-terminal family, this reference is directed to a portable electronic terminal with two (or more) display screens, addressing ergonomics of small portable terminals. Its relevance to '597 is as secondary evidence that multi-display / display-plus-input-surface portable terminals were known and conventional, and as a §103 "secondary reference" supporting the display-echo limitations (claims 3, 23) — but it is a weak reference for "echoing entered alphanumeric data on a display," which was already ubiquitous. Treat as marginal; confirm from the document.

4.7 US 5,945,928 — Tegic (Kushler et al.), "Reduced keyboard disambiguating system for the Korean language" (Aug. 31, 1999) — UNVERIFIED in this session

This is a member of the Tegic/T9 reduced-keyboard disambiguation family. Its relevance: it establishes the state of the art in reduced-keypad (12-key) alphanumeric entry on telephones and thus supplies the motivation and context for the '597 problem statement (the spec.'s "quick press of the '2' key followed by a pause… cumbersome, and not user friendly"). It is not itself a stroking reference. Confirm from the document.

4.8 Supplemental references retrieved in this session (NOT on the '597 face — flag separately)

• US 5,917,906 — Thornton, Ericsson, "Touch pad with tactile feature" (Jun. 29, 1999): "a radiotelephone with a touch pad having tactile features… a dual key and graphic entry pad… a key entry mode and a graphic entry mode." This is highly relevant to a §103 case on claims 1/20/21/40/41 (radiotelephone + touch-pad-as-keypad + mode switching between key entry and graphic/writing entry). Because it is not a face-of-patent citation, using it requires an independent §102(b) date check (it issued 1999-06-29 from an Oct. 1, 1997 filing — it would qualify as §102(b) art, but it was not before the Examiner).
• US 6,753,794 B1 — Adams, "Character entry using numeric keypad" (Jun. 22, 2004, filed May 16, 2001): cites Smith '303 and teaches "receiving at least a first key entry and a second key entry wherein said first key entry represents a first point in a character, and said second key represents a second point in the character, the first and second points being chosen to represent points on a projection of the character on the keypad." This reference is NOT §103 prior art against '597 (May 2001 filing vs. '597's Jan. 2001 priority), but it independently confirms that the "trace the letter's shape across the keypad" concept was in the air and was obvious to practitioners at the relevant time.

---

5. Claim-chart style obviousness — independent claims

Legend: T = teaches; S = suggests; — = absent; [Face] = on '597's face; [Supp.] = supplemental.

Result: No single reference discloses every element. But the combination of Smith + Misawa + Ure + Ericsson WO'677, and for the LED claims additionally Nokia '609, covers every element of independent claims 1, 21, 41, 42, 46; claims 43/47 are covered by subsets (see §6.5–6.6).

---

6. Grounds of rejection and articulated motivations

6.1 Ground I — Claims 1, 4–19, 21, 24–39, 46: Misawa '052 in view of Smith '303, further in view of Ericsson WO'677 and Ure '997

Why the combination:

1. Same field, same problem, same solution space. All four references address "how do I enter alphanumeric text fast on a small device without a full QWERTY keyboard?" Misawa's own background frames it exactly: "there is obviously a limit of miniaturization of keyboard"; "the moving area for pen and mouse is relatively large and size of each soft key is so small that the operator does not comfortably operate the keyboards." '597 states the identical problem ("most mobile phones, because of space limitations, merely include a 12-key 'numeric' keypad. Entry of alphabets require well timed pressing… cumbersome, and not user friendly"). KSR makes identity of problem a strong motivation.
2. Element-by-element substitution of known techniques with predictable results. Misawa already discloses every operative mechanism the '597 means-plus-function claim requires: sensing a continuous touch stroke; computing its direction; mapping the direction to a character code; outputting a binary representation; and visual feedback of the touched key. Adding Smith merely supplies the addition of a directional vocabulary already used in the telephone-keypad context (top-to-bottom, bottom-to-top, left-to-right, right-to-left) — a predictable, two-way variation of Misawa's known horizontal/diagonal classes.
3. Ericsson WO'677 supplies the missing "wireless mobile phone" integration, and does so with the express motivation to do exactly what '597 does — put a touch-sensitive key-region surface into a cellular telephone while preserving the ergonomics of physical keys. A POSA implementing Misawa's stroke-selection on a handset would arrive at the WO'677 architecture as a matter of ordinary design.
4. Ure supplies the "stroke spans multiple adjacent key regions" limitation (nine-area cross-hair, 36 two-touch patterns, "moving a finger across the touch-sensitive pad"). Applying Ure's multi-area touch-pattern concept to Misawa's directional-stroke engine is "the predictable use of prior art elements according to their established functions" — the KSR touchstone.
5. Mere automation of a manual technique / automation of a known mental step. Smith's pictographs and Misawa's bar-touch strokes are performed by a human hand; the '597 claim adds only that a micro-controller logs the traversed keys, times the cessation, and emits the code. The FIG. 2 algorithm is a straight-line state machine (detect → log → test continuing → on cessation, emit code). Under KSR and In re Venner, automating a known manual sequence with a known processor is obvious absent unexpected results.

Exemplary articulations for each dependent direction claim (claims 4–19 / 24–39):

6.2 Ground II — Claims 2 / 22 (transceiver): Ground I + admitted prior art + Nokia '609

The transceiver limitation is met by the specification's own admission: TX/RX 312 "may support one or more of any of the known signaling protocols, including but are not limited to CDMA, TDMA, GSM." Nokia '609 and Ericsson WO'677 both disclose a mobile telephone with transmitter/receiver for sending signals including entered characters. Under Constant v. Advanced Micro-Devices, 848 F.2d 1560 (Fed. Cir. 1988), a patent's own admissions about what is "known in the art" are prior art. This claim is very weak.

6.3 Ground III — Claims 3 / 23 (display echo): Ground I + Nokia '609 / Ricoh '945

Echoing entered characters on a mobile-phone LCD was ubiquitous: Nokia '609 ("The user… views the commands entered and other information on the display"); Misawa ("The results from the character generation means 74 are displayed on the liquid crystal display 3"). Where the art already displays the character generated from the stroke, echoing it is the inherent and intended function of the disclosed system. A separate reference is barely needed.

6.4 Ground IV — Claims 41, 42, 47 (LED echo): Ericsson WO'677 or Ure '997 + Smith/Misawa, in view of Nokia '609

This is the strongest ground on the face-of-patent art.

• Structure for claims 41/42/47 is supplied by WO'677 (physical keys over a touch-sensitive surface in a cellular telephone) and/or Ure '997 (touch-sensitive pad as the upper surface of mechanical keys, cl. 19–20).
• Stroke interpretation is supplied by Smith '303 and Misawa '052 as in Ground I.
• The LED limitation is met verbatim by Nokia '609: "each key… at least one illumination source… corresponds to each key"; "light emitting diode" (cl. 11); "illumination source disposed beneath"/"within" each key (cl. 2, 4); "a means for independently controlling activation of said plurality of illumination sources to identify one or more of said plurality of keys" (cl. 1). Nokia's claim 15 method recites "selectively illuminating at least one of said illumination sources of said keys."
• Direction and pattern-responsiveness are also there: the indexing key's two LEDs 218/219 indicate up/down, and the spec. describes turning one off as the user reaches the menu boundary — i.e., the illumination pattern is a function of the direction/position of the user's interaction.
• The only remaining delta is labelling: '597 calls the selective illumination a "visual echo of the key stroking pattern being imparted"; Nokia calls it "guide lights" for the next key. That is a difference in semantics assigned to a known output, not in structure, programming complexity, or result. Under KSR ("the combination of familiar elements according to known methods is likely to be obvious when it does no more than yield predictable results") and In re Harza, 324 F.2d 1004 (CCPA 1963) ("obvious to employ… known… for its intended purpose"), this is an obvious design choice. Moreover, the motivation is express: providing the user feedback that the correct key/pattern was sensed is the stated purpose of Nokia's guide lights ("the user may more quickly complete the menu selection and is less likely to initiate an undesired command") and of Misawa's reverse-display feedback ("it is easy to confirm which of the keys is touched") — the identical rationale animating '597's own LED-echo embodiment.
• Claim 47 is the most vulnerable claim in the patent. It recites only: monitoring stroking patterns of physical touch-sensitive keys that have LEDs, and "lighting said LEDs… to visually echo an observed key stroking pattern." It does not recite conversion to alphanumeric data, a transceiver, or a display. Nokia '609 alone, or Nokia '609 + Misawa '052 (reverse-display feedback of the stroked key) + Ure '997 (touch-sensitive pad on a mechanical key), renders claim 47 obvious on a very short motivation.

6.5 Ground V — Claims 43, 44, 45 (ancillary-function framing): Ground I + the admitted prior art on ancillary functions

Claim 43 is merely Ground I performed twice ("a first operation… a second operation"), and the specification itself identifies the ancillary functions and their conventional character: "the key stroking based input facilities are especially useful when working with 'ancillary' functions of phone 100…, such as performing a name search, updating a phone directory or calendar, replying to an email, or browsing a web page." Claim 45 recites exactly that list. Performing the same disclosed stroke-interpretation twice, in the context of the same disclosed phone, adds nothing patentable. Claim 43/44's overlap (see §3) further underscores that claim 44 adds only a second instance of claim 43's own step.

6.6 Ground VI — Claim 46 (micro-controller + programming instructions): Ground I

Claim 46 replaces the "means" language of claim 1 with "a micro-controller and associated memory, including programming instructions stored therein." That is the same invention recited in structural terms, and Ground I applies identically. Note that claim 46's own closing clause is broken by the missing antecedent (see §3), which means a challenger can also press § 112(b) in the alternative.

---

7. Secondary considerations (§ 103 rebuttal)

There is no evidence of record in the materials I have of:

• Commercial success with a nexus to the claimed subject matter (no evidence that any Wildseed/Varia product succeeded because of stroke-based entry);
• Long-felt but unmet need — the need was recognized and met many times over before 2001 (Misawa 1996, Ure 1996, Smith 1997, Ericsson 1997);
• Failure of others — the opposite; the art was crowded, and the "shape/gesture across keys" idea reappears repeatedly (e.g., Adams '794's May-2001 filing, and the later Nuance/Sharan "relative directions" patents US 8,462,118 / US 8,719,299 — cited-by art, not prior art, but evidence of the field's natural trajectory);
• Industry praise or licensing attributable to '597 specifically.

Absent a nexus, the secondary considerations are neutral at best. The patent's expiry (2022-01-31) and the absence of any identified assertion of '597 in litigation further mean that no commercial-obstacle or licensing-nexus record is likely to be developed.

---

8. Where the obviousness case is weakest (candid counter-analysis)

8.1 The core "two or more adjacent keys" limitation

The only limitation that all seven face-of-patent references leave partially unmet is the claim-1/21 closing clause: a stroke pattern direction defined by stroking two or more adjacent keys. Misawa's strokes are primarily within a key (bar touch across a key's pixels); Ure's are simultaneous multi-finger chords and lateral movement; Smith's are two discrete keystrokes. A Patent Owner would argue that none teaches "a continuous glide across a span of adjacent keys where the span itself is the directional primitive."

Challenger's answer: (a) Ure's nine-area cross-hair with 36 two-touch patterns built on "adjoining" areas and "intersections" (cls. 8, 13, 14, 16) is a multi-adjacent-area pattern device; (b) Misawa's FIG. 14 discrimination is expressly direction-based and translation-based, and its "moved… in a slanting direction or along a shape 'V'" language contemplates a path crossing regions; (c) the specification itself defines direction as a function of key rows and columns ("[1,4] in a downward direction, [0,8] in an upward direction, [1,2,3] in a rightward direction"), i.e., the direction of a multi-key span is an arithmetic consequence of the key grid, and converting a per-key bar-touch into a per-grid-span glide is a predictable mechanical adaptation. This is a strong but not airtight argument; it is the hinge on which any §103 challenge turns.

8.2 The two-segment direction claims (8–15 / 28–35)

The face-of-patent set is genuinely thin on compound, direction-changing strokes (down-then-right, right-then-up, etc.). Misawa's "V"/inverted-V and Smith's compound pictographs are the best available, but a Patent Owner could argue these are single-turn glyphs, not the enumerated two-segment primitives. A challenger would want supplemental art here — and, critically, supplemental art must still predate 2001-01-22, which rules out the most on-point-looking later references (Adams '794; the Nuance family).

8.3 WO 97/41677 arguably teaches away from pure touch-input

WO'677's entire premise is that "a major disadvantage of such touch sensitive screens is the lack of positive tactile feedback" and that "many users still find touch sensitive screens to be undesirable." A Patent Owner could argue this discourages the '597 touch-stroke approach.

Challenger's answer: the teaching-away analysis asks what the reference would have suggested to a POSA who is not the inventor's opponent-by-hindsight. WO'677 is not saying "never sense touch on a keypad"; it is saying "add tactile keys over the touch surface." It therefore preserves and endorses touch-region sensing while eliminating its drawback — which is more motivation to combine, not less. Also, this teaching-away argument is unavailable against claims 20/40 (soft-key touch pad), where WO'677's criticism of touch screens is beside the point because the '597 spec. expressly embraces touch pads. Cf. In re Urbanski, 809 F.2d 1237 (Fed. Cir. 1987) (a reference teaches away only if a POSA would be discouraged from following the path).

8.4 Prosecution history

All seven references were before the Examiner and the claims issued. A challenger must therefore explain why the combination was not made — the strongest available explanation (and the one I would expect a Patent Owner to press) is that the specific multi-key continuous glide with enumerated direction primitives was not shown. That is a real, if narrow, position. It is also why an IPR petitioner would likely lead with new art (post-issuance patents/printed publications under § 311(b) are limited to patents and printed publications) rather than the face-of-patent set.

8.5 Indefiniteness as a parallel attack

Claim 46's missing antecedent and claims 43/44's overlap are § 112(b) problems that, if sustained, remove or narrow the independent claims a challenger most needs to beat.

---

9. Bottom line

On the face-of-patent art alone:

Overall: The independent claims are more likely than not obvious over a properly articulated combination of Misawa '052 + Smith '303 + Ure '997 + Ericsson WO'677, with Nokia '609 supplying the LED limitations for claims 41/42/47 and the transceiver/display limitations for claims 2/3/22/23. The weakest part of the case is the enumerated two-segment direction claims (8–15 / 28–35), and the strongest part is claim 47, whose recitation is so bare that Nokia '609 plus a touch-sensing reference practically disposes of it. Because the strongest references were before the Examiner, any real-world challenge would be substantially strengthened by the supplemental references identified in §4.8 (notably Thornton US 5,917,906, an Ericsson radiotelephone with a touch pad operable in key-entry and graphic-entry modes), subject to a fresh §102(b) date analysis.

Two things I will not assert:

1. That any claim is anticipated. On the retrieved texts, none of the seven references discloses the full "stroke pattern direction defined by stroking two or more adjacent keys" limitation under a single-reference reading.
2. That my characterizations of US 6,297,945 (Ricoh) and US 5,945,928 (Tegic) are reliable — I could not re-retrieve them in this session and flagged both as UNVERIFIED in §4.6–4.7. A firm opinion requires pulling both documents and, for any real challenge, running the pre-2001 search that the Examiner did not.