US 7414611

I'll search for authoritative information on this specific patent number.

Let me verify the claim set and check for any 2026 appellate activity.

Let me verify the claim structure and check the Federal Circuit docket specifically.

US 7,414,611 B2 — Summary

Search scope note: I searched public web sources that mirror USPTO data (Google Patents, Espacenet, RPX Insight, Justia) and for CAFC 2026 docket activity. I could not directly query USPTO Patent Center, USPTO Assignment, or the CAFC CM/ECF docket from this session, so the items below are grounded in the mirror sources cited. Where I am not certain, I say so explicitly.

1. Bibliographic data (high confidence)

Continuity: Continuation of Ser. No. 11/640,677 (filed Dec. 18, 2006, issued as US 7,262,760), itself a continuation of Ser. No. 11/119,719 (filed May 2, 2005, issued Jan. 2, 2007 as US 7,158,118), which claims priority from provisional 60/566,444 (Apr. 30, 2004); also related to provisionals 60/612,571 (Sep. 23, 2004) and 60/641,410 (Jan. 5, 2005). Later continuations in the family include US 8,072,424; 8,629,836; 8,937,594; 9,298,282; 9,946,356; and 10,782,792.

Classifications: G06F3/0346, G06F3/0383, G06F3/017, H04N21/42222.

Assignment chain (per Google Patents reassignment record): Hillcrest Laboratories → security interests to Hercules Technology III, L.P. (2012), released 2015 → security interest to Multiplier Capital, LP (2016), released 2017 → IDHL Holdings, Inc. (2017) → DRNC Holdings, Inc. (2023).

Litigation shown: D. Md. case 8:08-cv-02188; ITC investigation 337-TA-658. Both are historical (2008-era), not 2026 activity.

2. Abstract (verbatim)

"Systems and methods according to the present invention describe 3D pointing devices which enhance usability by transforming sensed motion data from a first frame of reference (e.g., the body of the 3D pointing device) into a second frame of reference (e.g., a user's frame of reference). One exemplary embodiment of the present invention removes effects associated with a tilt orientation in which the 3D pointing device is held by a user."

3. Plain-language overview of the independent claims

⚠️ Important uncertainty flag: The authoritative full text supplied for this patent ends mid-sentence in the Detailed Description and does not include the claims. The claim text below is taken from a third-party database (RPX Insight, https://insight.rpxcorp.com/patent/[US7414611B2](/patent/US7414611B2)), which lists 95 claims with independent claims at 1, 20, 39, 58, and 77. I could not independently re-verify the claim count or exact wording against the USPTO full text in this session — treat the claim language as likely but unconfirmed. Notably, the granted claims as reported are drafted in means-plus-function form and recite a "two-dimensional rotational transform," whereas the patent's own SUMMARY section describes the invention in structural terms (first/second rotational sensors, accelerometer, processing unit). That discrepancy is worth double-checking against the official copy.

Technical core (from the specification): The device senses rotation about two axes plus linear acceleration. Tilt θ is computed from the gravity vector as θ = tan⁻¹(y/z), numerically atan2(y,z), and the sensed rotational inputs (αy, αz) are rotated by a 2×2 rotation matrix [cosθ sinθ; −sinθ cosθ] to map reading from the body frame into the user's/inertial frame (Eq. 8). Supporting features include accelerometer calibration (Eq. 1), linear-acceleration compensation of the rotational sensors (Eq. 4), temperature/dynamic offset compensation (Eq. 5), a stationary-detection state machine (ACTIVE→INACTIVE→STABLE/STATIONARY→SLEEP→WAKEUP) using variance, FFT/peak detection of 8–12 Hz hand tremor, and a general quaternion/DCM formulation for transforming body-frame motion into a user frame of reference.

4. CAFC 2026 docket check — no evidence found

• I found no Federal Circuit appeal, oral argument, or docket entry in 2026 involving US 7,414,611. Searches returned only unrelated 2026 Federal Circuit materials (e.g., an amicus brief on obviousness-type double patenting in Ex parte Baurin, and the Applications In Internet Time v. Salesforce rehearing petition). None reference this patent.
• This is consistent with the patent being expired as of May 2, 2025 and its asserted litigation dating to 2008.
• Caveat: I could not query the CAFC CM/ECF docket directly; absence of a search hit is not affirmative proof that no appeal exists, only that nothing surfaced in public search indexes.
• One adjacent data point: the number "7414611" appears in PTAB petition prior-art search logs (ptacts.uspto.gov petitions 1522655 and 1522876) as part of large multi-patent number queries. This indicates the patent was searched/considered in a post-grant proceeding, but I could not confirm that a petition was filed against the '611 patent itself. Do not treat that as an IPR or PGR against '611.

5. Bottom line

US 7,414,611 is the Liberty/Hillcrest "tilt compensation" patent that claims determining how a 3D pointing device is held (via accelerometer) and applying a two-dimensional rotational transform to the sensed motion so cursor control is independent of grip orientation. It issued Aug. 19, 2008, traces priority to Apr. 30, 2004, is now expired, is held by DRNC Holdings, Inc., and shows no trace of 2026 Federal Circuit activity.

I'll research litigation involving US 7414611 using the sources you specified.

Let me gather additional detail on outcomes and check for any other assertions.

Let me check for any PTAB proceedings and later assertions involving this patent.

Known Litigation Involving U.S. Patent No. 7,414,611

Patent: U.S. 7,414,611 B2 — "3D pointing devices with orientation compensation and improved usability"
Inventor: Matthew G. Liberty
Original assignee: Hillcrest Laboratories, Inc. (Rockville, MD); current assignee DRNC Holdings, Inc.
Filing date (app.): June 20, 2007 | Granted: August 19, 2008 | Priority: April 30, 2004

The '611 patent was asserted together with three related Hillcrest patents — U.S. 7,139,983, U.S. 7,158,118, and U.S. 7,262,760 — in a coordinated pair of 2008 enforcement actions against Nintendo over the Wii console and its "Wiimote" motion controller. I found two proceedings involving this patent.

1. ITC Section 337 Investigation — In the Matter of Certain Video Game Machines and Related Three-Dimensional Pointing Devices

The Commission's notice of investigation states the complaint alleged infringement of, inter alia, certain claims of "U.S. Patent Nos. 7,139,983; 7,158,118; 7,262,760; and 7,414,611." (USITC notice, 337-TA-658; Fed. Reg. 73 FR 54854)

Termination notice: 74 FR 50820 (Oct. 1, 2009). Note that the ALJ had a 300+ page final Initial Determination ready to issue Aug. 24, 2009, but the settlement mooted it (Order No. 43, extending the target date to Feb. 23, 2010).

2. District Court Action — Hillcrest Laboratories, Inc. v. Nintendo Co., Ltd. et al.

Sources: Stanford NPE Litigation Database, patent 7414611; Patent Arcade case update; Maryland Daily Record, "Hillcrest ends suit over Nintendo Wii remote". Bloomberg's Aug. 24, 2009 report identifies the civil case as "Hillcrest Laboratories Inc. v. Nintendo Co., 08cv2199," which appears to be a variant/docket reference to the same Maryland action.

Summary and Caveats

• Only one dispute (Hillcrest v. Nintendo) is known to have asserted the '611 patent. It involved two parallel fora (ITC + D. Md.), both resolved in 2009 by confidential settlement — no merits ruling, no liability finding, no exclusion order.
• Outcome: both proceedings closed without adjudication. The IPR trail shows the '611 patent being cited as prior art in later PTAB proceedings (e.g., HTC v. Electronic Scripting Products, IPR2018-01031), but I found no PTAB/IPR petition challenging the '611 patent itself, and no later infringement suits naming it.
• Notes: The Google Patents page for US7414611 also flags "Family has litigation" pointing to D. Md. case 8:08-cv-02188 and ITC 337-TA-658, consistent with the above. The patent expired for non-payment/term on May 2, 2025 (anticipated expiration).

Caveat on completeness: I was able to confirm the two 2008–2009 proceedings via USITC/Federal Register notices, the Stanford NPE database, and press coverage. My search was cut short before I could exhaustively check PACER dockets, the Unified Patents litigation portal, or any post-2010 activity by DRNC Holdings/later assignees. If you need certified confirmation that no additional suits exist (particularly any involving the current assignee DRNC Holdings or IDHL Holdings), I'd recommend a direct PACER docket search and a check of the Unified Patents litigation database — I could not complete that verification here.

I'll start by verifying the structured PTAB list against public records.

Let me run a couple more targeted checks before concluding.

One more check on the surrounding family, since family-level PTAB activity is a useful signal.

Proceedings overview

Total AIA trial proceedings on US 7,414,611: zero. The structured PTAB list supplied for this analysis (USPTO Open Data Portal ingest) returns no inter partes reviews, no post-grant reviews, and no covered business method reviews for this patent — a 0 / 0 / 0 / 0 split across active, claims-invalidated, claims-sustained, and settled, with no institution denials either. Defensive posture: there is no IPR record to lean on and no estoppel to exploit, but that absence is itself the story — this patent was asserted exactly once (2008, against Nintendo), settled in 2009, and has since expired; no challenger ever took it to the Board, and nobody has asserted it in over 15 years.

Because there are no proceedings to enumerate, the per-proceeding template has nothing to populate. Instead I document the near-misses — three items that surface in searches for "7414611" inside PTAB-adjacent documents and that could be mistaken for Board activity — and then give the cross-cutting picture.

Near-misses examined (none is an AIA proceeding against the '611 patent)

I found no Final Written Decision, institution decision, denial, or CAFC appeal touching the '611 patent, and no PTAB trial number naming DRNC Holdings, IDHL Holdings, or Hillcrest Laboratories as patent owner for this patent. I could not directly query the ODP API endpoint or PTAB E2E from this session, so my confirmation rests on the structured ingest block plus these searches; the two independent lines of evidence agree.

Strategic summary

Claim status: everything is UNTESTED. No claim of 7,414,611 has ever been canceled, confirmed, or construed by the Board or by any court. Claims 1, 20, 39, 58, and 77 and all 95 claims reported for the patent remain as granted — unadjudicated and, per the earlier section's uncertainty flag, still not independently verified against the official claim text. There is no narrowing certificate, no certificate of correction, and no IPR survivorship to point at. For a defendant, this cuts both ways: the patent has never been weakened by the Board, but it has also never been hardened — there is no panel holding you can cite as validating the claims.

Estoppel landscape: essentially empty. Because no petitioner ever filed, § 315(e)(2) estoppel does not apply to anyone. There is no petitioner or privy barred from re-raising art in a district court or ITC action, and no prior PTAB record that limits what a new challenger can argue. Any prior-art ground you want to run — anticipation, obviousness, § 112 written description or enablement against the mean-plus-function claim format noted earlier, or a § 101 challenge — is fully available, unencumbered, and has never been considered by the Board. The related-patent art that was considered in Examiner searches (the '326, '298, '154, '760, '118 cluster) is a starting point, not a § 325(d) problem, since none of it was considered in a Board proceeding.

Pattern signals. The patent never attracted IPRs, which is unusual for a patent that was once asserted in a headline ITC action. Two plausible readings: (1) the 2009 global settlement with Nintendo ended the commercial relevance of the family before the IPR regime matured — the AIA's first IPRs landed in 2012–2013, roughly four years after the last assertion; and (2) the family's later monetization (IDHL → DRNC Holdings, Inc., 2023) came after the longest-lived claim had already run out. Expiration on 2025-05-02 means there is no live term left to enjoin, which removes most of the incentive to file. Note that expiration is not a categorical bar to IPR — the Board does institute on expired patents for past-damages purposes, and Patent Owners have successfully argued discretionary denial in exactly that fact pattern (see the § 314(a)/settled-expectations argument in the '287-related briefing surfaced in search: https://ptacts.uspto.gov/ptacts/public-informations/petitions/[1557496](/patent/1557496)/download-documents). So the zero count reflects lack of demand, not impossibility.

⚠️ Contradiction check: none. The structured PTAB block, my web searches, and the earlier litigation section (which flagged the PTACTS hits as mere search logs, not petitions) are mutually consistent.

Recommended next steps

If you are a defendant facing a demand or complaint today:

• Say so plainly, and say why it matters. There is no PTAB activity on US 7,414,611 — no IPR, no PGR, no CBM, no FWD, no appeal. You cannot cite an invalidation; you also are not fighting a hardened patent.
• Lead with the date, not the Board. The patent's term ran out on 2025-05-02 and Google Patents lists legal status "Expired – Lifetime" (https://patents.google.com/patent/US7414611/en). Pre-suit, the practical question for any demand letter citing this patent is what recoverable past damages (if any) remain within the § 286 six-year lookback, given the last known assertion was dismissed with prejudice on 2009-10-16 in Hillcrest Labs., Inc. v. Nintendo Co., No. 8:08-cv-02188-RWT (D. Md.), following ITC Investigation No. 337-TA-658 termination (74 FR 50820, 2009-10-01). Both historical records are in the earlier litigation section.
• Verify the claims before you rely on the earlier summary's claim text. The authoritative full text supplied here stops mid-sentence in the Detailed Description and contains no claims at all. The claim numbering (95 claims; independents at 1, 20, 39, 58, 77) came from a third-party database (RPX Insight) and is unconfirmed. Pull the granted claims from USPTO Patent Center or the printed patent before drafting anything. This matters more than usual here, because the reported claims are in means-plus-function form with a "two-dimensional rotational transform" limitation that does not map cleanly onto the specification's structural SUMMARY — a § 112(f) indefiniteness / lack of corresponding structure attack is likely the single highest-value invalidity angle, and it is completely untested.
• If the demand letter is from DRNC Holdings (or IDHL Holdings), ask for the assertion history. The Google Patents family page flags only the two 2008–2009 matters. My search was not exhaustive of PACER or the Unified Patents litigation database; a direct PACER docket search for DRNC Holdings and IDHL Holdings is the correct next verification step, and you should ask plaintiff to identify every prior assertion of the '611 patent and each related family member.

If you were considering filing an IPR yourself: don't plan around the Board as your primary forum. With no live term, the practical leverage is in district court and in the damages lookback, not in cancellation. If you do file, note there is no § 315(b) bar risk unless and until you are served on this patent, and no § 315(e) estoppel from anyone else to inherit.

Confidence and limitations. High confidence that no AIA trial proceeding exists against US 7,414,611: the structured ODP-derived list says zero and independent web searches returned no petition, institution decision, FWD, or appeal. I could not directly query the ODP API or PTAB E2E in this session, and I reached the tool-call limit before exhaustively checking family-level proceedings against Hillcrest/IDHL/DRNC patents — an absence I flag rather than paper over.

I'll research the assignment record for US 7414611, focusing on reel/frame numbers and correspondents of record.

Ownership & Assignment Reconstruction — US 7,414,611 B2

Analyst note on sourcing. Consistent with the earlier sections, I could not open USPTO Assignment Center (assignmentcenter.uspto.gov) or the legacy assignment.uspto.gov index as a live database query from this session. The timeline below is anchored on:

• the authoritative full text / Google Patents "reassignment" legal-events record for US 7,414,611 (dates + conveyance types), and
• a corroborating RPX litigation assignment record for the DRNC link (reel/frame + correspondent).

Reel/frame numbers are generally not exposed by the mirrors I could reach. The single reel/frame that is independently corroborated in the patent's own text is REEL 042603 / FRAME 0133 (cited verbatim in the 2017 corrective assignment). Where I do not have a reel/frame I say so rather than guessing. Verify everything at: https://assignmentcenter.uspto.gov/ (search "7414611").

Cross-check note vs. earlier sections: the previously generated "Patent summary" states Ser. No. 11/640,677 "issued as US 7,262,760." The authoritative text supplied does not say this — it says only that 11/640,677 is a continuation of 11/119,719, "which issued on Jan. 2, 2007 as U.S. Pat. No. 7,158,118." Treat 7,262,760 as an unconfirmed cross-reference, not a stated fact.

Inventors

Unusual-pattern check: the "all inventors departing the original assignee within 12 months" tell is not present — and cannot be, because there is a single inventor. More importantly, Liberty stayed with the portfolio through both changes of owner: he is the #2 named inventor on the successor entity IDHL Holdings' later filings (GoodIP lists Liberty with 11 IDHL-family patents, alongside Cook, Li, Turner, Simpkins — the same Hillcrest engineering bench). So there was no inventor exodus preceding a fire-sale; the engineering team transferred with the assets.

Original assignee

Hillcrest Laboratories, Inc. (Rockville, MD; later 15245 Shady Grove Road, Rockville, MD 20850) — named on the issued patent.

• Line of business: motion-control / "free-space pointing" research-and-products company. It was not a paper entity: Hillcrest commercialized 3D pointing technology (the "Loop" pointer, "Freespace" motion control) and licensed it into consumer devices (e.g., the Logitech MX Air, LG media remotes). It also asserted its own patents against a competitor in 2008 (see below).
• Product embodying the claims: Hillcrest shipped/hardware-licensed 3D pointer products and reference designs practicing the tilt-compensation scheme described in the specification — i.e., an operating company, not a shell.
• Current status: Acquired by InterDigital, Inc. (NASDAQ: IDCC) in December 2016 for ~$48M (per InterDigital's 2017 Form 10-K). The purchase-price allocation was almost entirely intangibles — patents/existing technology $36.2M, goodwill $16.2M — with a net working-capital deficit of ~$8.9M, i.e., a financially distressed but going-concern sale (no bankruptcy filing located). Hillcrest continues as the "Hillcrest Labs" business within InterDigital; the Hillcrest name was later replaced in the ownership record by IDHL Holdings, Inc. (see timeline).

Assignment timeline

Dates below are the recordation/event dates as surfaced by the Google Patents legal-events record; execution dates were not independently confirmed except where noted. The patent issued 2008-08-19.

• 2012-04-10 (recorded) — Reel/frame not retrieved

  • Conveyance: SECURITY AGREEMENT
  • Assignor: Hillcrest Laboratories, Inc.
  • Assignee: Hercules Technology III, L.P.
  • Correspondent: not retrieved from public mirror
  • Context: Securitization — venture-debt collateral lien over the Hillcrest portfolio; not a transfer of title.

• 2015-06-12 (recorded) — Reel/frame not retrieved

  • Conveyance: RELEASE BY SECURED PARTY (see document for details)
  • Assignor: Hercules Technology III, L.P.
  • Assignee: Hillcrest Laboratories, Inc.
  • Correspondent: not retrieved
  • Context: Lien release — Hercules security interest discharged; title never left Hillcrest.

• 2016-03-01 (recorded) — Reel/frame not retrieved

  • Conveyance: SECURITY AGREEMENT
  • Assignor: Hillcrest Laboratories, Inc.
  • Assignee: Multiplier Capital, LP
  • Correspondent: not retrieved
  • Context: Securitization (refinancing) — replacement venture lender takes a collateral lien.

• 2017-06-05 (recorded) — Reel 042603 / Frame 0133 (cited verbatim in the later corrective assignment)

  • Conveyance: RELEASE BY SECURED PARTY
  • Assignor: Multiplier Capital, LP
  • Assignee: Hillcrest Laboratories, Inc.
  • Correspondent: not retrieved
  • Context: Lien release — clears the Multiplier encumbrance immediately before the asset sale.

• 2017-06-05 (recorded) — Reel/frame not retrieved

  • Conveyance: ASSIGNMENT OF ASSIGNOR'S INTEREST
  • Assignor: Hillcrest Laboratories, Inc.
  • Assignee: IDHL Holdings, Inc.
  • Correspondent: not retrieved
  • Context: Post-acquisition internal transfer — Hillcrest's assets, including this patent, moved into the IDHL Holdings entity ~6 months after InterDigital's Dec. 2016 acquisition.

• 2017-11-01 (recorded) — Reel/frame not retrieved

  • Conveyance: CORRECTIVE ASSIGNMENT to correct the re-recorded release of security interest previously recorded at Reel 042603 / Frame 0133; assignor confirms the assignment
  • Assignor: Multiplier Capital, LP
  • Assignee: Hillcrest Laboratories, Inc.
  • Correspondent: not retrieved
  • Context: Administrative correction of the June 2017 lien release — housekeeping, no change in title.

• 2023-04-13 (recorded) — Reel/frame likely 70071 / 0327 (unconfirmed)

  • Conveyance: ASSIGNMENT OF ASSIGNOR'S INTEREST
  • Assignor: IDHL Holdings, Inc.
  • Assignee: DRNC Holdings, Inc. — 200 Bellevue Parkway, Suite 300, Wilmington, Delaware 19809
  • Correspondent: "PATENT DOCKETING," 200 Bellevue Parkway, Suite 300, Wilmington, DE 19809 — i.e., the assignee's own docketing desk, not an outside law firm. Only one correspondent data point is confirmed; I cannot establish recurrence across the chain, so the "repeat correspondent" tell is unproven.
  • Context: Transfer to holding entity / corporate reorganization. An RPX-recorded DRNC assignment (litigation.rpxcorp.com/patent_assignment/67833855, header "70071/327") matches this assignee + address + correspondent and covers 287 patents; I could not confirm that this specific record includes the '611 patent, so the reel/frame is flagged as probable, not certain.

• 2025-05-02 — Anticipated expiration (patent Expired – Lifetime; per Google Patents legal status).

Chain-of-title warning: The 2016 and 2017 "assigned to" events on the Google Patents timeline are a mix of security interests/releases and true assignments. Only the 2017-06-05 (→ IDHL Holdings) and 2023-04-13 (→ DRNC Holdings) events are transfers of title. Do not read the Hercules/Multiplier entries as ownership changes.

Timeline diagram

timeline
    title Ownership of US 7414611
    2004 : Priority date Apr 30
    2007 : Continuation filed Jun 20
    2008 : Patent granted Aug 19
         : Hillcrest sues Nintendo over Wii
    2012 : Hercules security interest taken
    2015 : Hercules lien released
    2016 : Multiplier lien taken
         : Hillcrest acquired by InterDigital
    2017 : Multiplier lien released
         : Title moves to IDHL Holdings
    2023 : Title moves to DRNC Holdings
    2025 : Patent expires May 2

NPE / troll-pattern signals

1. Shell-entity transfer — unclear / partial. The patent did move out of the operating company into entities whose names carry the "Holdings" tell: Hillcrest → IDHL Holdings, Inc. (2017-06-05) → DRNC Holdings, Inc. (2023-04-13), the latter at a Wilmington, DE office-suite address (200 Bellevue Parkway, Suite 300) with self-docketed correspondent ("PATENT DOCKETING") rather than an outside firm. But IDHL Holdings was not a passive shell — it continued substantive R&D, filing new sensor/calibration patents 2017–2019 with the same Hillcrest inventors. There is no product evidence for DRNC Holdings, but "no product evidence" alone is not proof. Net: partial, per the instruction not to treat naming alone as a finding.

2. Known asserter in the chain — not present. None of the enumerated NPE families (Acacia, Marathon, Intellectual Ventures, IPNav, Wi-LAN, Mosaid/Conversant, Vringo, Pendrell, Innovatio, MPHJ, Lumen View, Round Rock, Document Generation Corp, Spangenberg entities) appear as assignor or assignee. Note for completeness: InterDigital is a large public licensing company, and Unified Patents lists "Parent Company: Interdigital" for a sibling patent whose original assignee is IDHL Holdings — but InterDigital is an SEP licensor, not on the classic high-frequency-plaintiff lists.

3. Repeat correspondent across the chain — unclear, no evidence. Only one correspondent is confirmed (DRNC's "PATENT DOCKETING," 200 Bellevue Parkway, Wilmington DE on the 2023 record). One appearance is not recurrence.

4. Cascading transfers (<24 months through chained LLCs) — not present. The two title transfers are 2017-06-05 and 2023-04-13 — roughly six years apart. The clustered 2015–2017 entries are lien/release housekeeping, not a cascade.

5. Pre-litigation transfer — not present. The only suit naming this patent was filed 2008-08-20, one day after grant. Ownership at that time was Hillcrest itself — no assignment within six months before (or after) the filing. All post-issuance assignments postdate the litigation by years.

6. Bankruptcy fire-sale — not present. No Chapter 7/11 located. Hillcrest was acquired in a distressed but non-bankruptcy going-concern sale (net working-capital deficit ~$8.9M).

7. Privateering — not present. The pattern runs the other way: the 2008 assertion was the operating company suing a competitor (Nintendo/Wii) on its own patents. The later transfers are internal reorg / M&A integration, with no evidence of arming an NPE against competitors.

8. Defensive aggregator — not present. The chain terminates at DRNC Holdings, Inc., not at RPX, AST, LOT Network, Unified Patents, or OIN. No neutralizing assignment.

Verdict

NPE — moderate confidence.

The chain does transition from a genuine operating company (Hillcrest, which shipped/ licensed 3D pointing products and sued Nintendo on this family in 2008) into successive "Holdings" entities with no product evidence — IDHL Holdings (2017-06-05) and ultimately DRNC Holdings, Inc. (2023-04-13), the latter recording a self-docketed correspondent at a Wilmington, DE office-suite address (200 Bellevue Parkway, Suite 300). Those are the two weak signals that support a moderate call.

But this is a genuinely borderline case, and I want to be explicit about the counter-evidence: there is no known asserter on any NPE list, no repeat correspondent established, no pre-litigation transfer, no bankruptcy, and the only litigation was an operating-company suit against an actual competitor. IDHL Holdings also kept doing real R&D. Because the patent expired 2025-05-02 and no post-2008 suit names it, the practical effect is a non-practicing holding entity that never re-asserted '611. If DRNC turns out to be merely an InterDigital reorganization vehicle (as the "Parent Company: Interdigital" data point on a sibling patent suggests), the correct characterization weakens to non-practicing-entity holding rather than classic troll activity.

Verification links:

• USPTO Assignment Center (search 7414611): https://assignmentcenter.uspto.gov/
• Legacy Assignment Search: https://assignment.uspto.gov/patent/index.html
• Google Patents legal events: https://patents.google.com/patent/US7414611/en
• RPX-recorded DRNC assignment (probable 2023 link): https://litigation.rpxcorp.com/patent_assignment/67833855
• Stanford NPE database, patent 7414611: https://npe.law.stanford.edu/patent/7414611

To close the remaining gaps, a direct Assignment Center pull is needed to capture the execution dates and reel/frame numbers for the 2012-04-10 Hercules, 2015-06-12 Hercules release, 2016-03-01 Multiplier, 2017-06-05 IDHL assignment, and 2017-11-01 corrective records, plus confirmation that reel 70071/0327 covers the '611 patent — none of which I could verify as a live database query here.

I'll research the prior art citations for US 7,414,611. Let me search authoritative sources.

Let me get the actual "References Cited" front-page data for this patent.

Let me try to retrieve the front-page cited references directly from patent databases.

Prior-Art Analysis — US 7,414,611 B2

Patent: US 7,414,611 B2 ("the '611 patent") — 3D pointing devices with orientation compensation and improved usability
Inventor: Matthew G. Liberty | Original assignee: Hillcrest Laboratories, Inc. | Issue date: Aug. 19, 2008 | App. 11/820,517, filed June 20, 2007 | Earliest priority: Apr. 30, 2004 (prov. 60/566,444)

⚠️ Scope / verification caveat (read first)

Two things materially constrain the confidence of this analysis, and I want to state them up front rather than paper over them:

1. The authoritative full text supplied for this patent ends mid-sentence in the Detailed Description and does NOT include either the claims or the front-page "(56) References Cited" list. Google Patents renders the front page (citations, examiner, art unit) in a sub-page that was not captured in the supplied text, and my searches for that specific block returned the specification text and cited-by lists rather than the cited-references list.

2. I was cut off mid-research and could not complete retrieval of the complete examiner-cited reference list (U.S. patents, foreign patents, and NPL) from the '611 front page or the file wrapper. What follows is therefore a best-supported reconstruction, not a certified transcription of the (56) list.

I flag below exactly which items are confirmed from a source vs. inferred. I have not auto-corrected any patent number; all identifiers are reproduced literally as they appeared.

1. References I could positively tie to the '611 patent

Do not treat items D/E as an IPR or PGR against '611. The ptacts log is a search-history artifact from a different proceeding (application 13/176,771 / petition 1522876), listed only because the attorney ran a multi-patent-number query that happened to include "7414611" and the mother patents. It shows the cluster of numbers an examiner considered — useful corroboration of the art cluster, not evidence of a validity challenge.

What I could NOT retrieve / verify: the complete (56) U.S.-patent list, the foreign-patent list, and the non-patent-literature list on the '611 front page. Any statement that a given reference is the examiner's cited art — beyond items A–C — is inference. If you need the certified list, the authoritative sources are the '611 front page image (USPTO PatentCenter / patentimages PDF) and the file wrapper (IFW) under application 11/820,517.

2. Reference-by-reference: citation, date, description, and § 102 analysis

Reference A — US 5,440,326 (Quinn)

• Full citation: U.S. Patent No. 5,440,326, to Quinn (assignee Gyration, Inc.). Issued Aug. 8, 1995.
• Description (as characterized in the '611 specification itself): A vertical gyroscope adapted for use as a pointing device controlling cursor position on a computer display. A motor at the gyroscope core is suspended by two pairs of orthogonal gimbals from a hand-held controller and is nominally oriented with its spin axis vertical by a pendulous device. Electro-optical shaft-angle encoders sense the orientation of the hand-held controller as it is manipulated, and the output is converted to a format usable by a computer to control cursor movement.
• § 102 analysis: Anticipates nothing as to the independent claims. The '611 independent claims (as reported: 1, 20, 39, 58, 77 — see the summary's uncertainty flag) require an accelerometer producing an acceleration output from which the held orientation is determined, and a two-dimensional rotational transform applied to a motion-sensor output to render cursor motion independent of grip. Quinn '326 uses a gimbaled mechanical gyroscope + optical encoders; it contains no accelerometer and no accelerometer-derived tilt computation. It is § 102 background art only (it is the archetype of "body-frame-referenced" pointing that the '611 patent purports to improve upon), and it is of § 103 interest only as a teaching of 3D free-space pointing generally.

Reference B — US 5,138,154 A ("Shaft Angle Encoder with Rotating Off-axis Interference Pattern")

• Full citation: U.S. Patent No. 5,138,154 A. Issued Aug. 11, 1992 (title as returned by the source above; verify on the front-page image).
• Description: An optical shaft-angle encoder employing a rotating off-axis interference pattern to measure angular position. It is a component-level reference — the encoder technology used in gimbaled/mechanical 3D pointers (including Quinn '326) to convert shaft rotation into electrical output.
• § 102 analysis: Does not anticipate any of claims 1, 20, 39, 58, or 77. It discloses no handheld free-space pointing device, no accelerometer, and no frame-of-reference transform. Relevance is limited to the encoder sub-element of the pre-existing gyroscope art. Its presence on the list would be explained as a § 103 secondary reference (the shaft-angle-encoder art the gyroscope pointer depended on), not as anticipatory art.

Reference C — US 4,839,838 A ("Spatial Input Apparatus")

• Full citation: U.S. Patent No. 4,839,838 A ("Spatial Input Apparatus"). Issued June 13, 1989 (date shown is a reconstruction — verify on the front-page image).
• Description: A spatial (multi-degree-of-freedom) input apparatus for entering three-dimensional position/orientation information to a computer — representative of the pre-1990 6-DOF spatial-input literature.
• § 102 analysis: No anticipation. Spatial-input apparatuses in this lineage typically use mechanical linkages, magnetic, ultrasonic, or optical tracking — not the rotational-sensor + accelerometer + tilt-transform combination the '611 claims require. Potentially relevant as § 103 general-state-of-the-art evidence that free-space/3D input was known, but it does not disclose the accelerometer-based orientation determination or the rotational transform of the sensed motion signal.

Reference D — US 5,898,421 (cluster member; possible citation)

• Full citation: U.S. Patent No. 5,898,421. (I could not confirm the title/inventor from a primary source in this session — do not rely on it until verified.)
• Description: Surfaces in the same examiner cluster as '326 and '154 and, in the Hillcrest/Gyration art family, generally corresponds to inertial/gyroscopic pointer subject matter (Quinn/Gyration lineage).
• § 102 analysis: If it is a gyroscopic-pointer reference in the Quinn line, the analysis is the same as for Reference A — no accelerometer, no accelerometer-derived tilt, no rotational transform of a dual-axis motion signal; not anticipatory.

3. The legally decisive limitations (what a § 102 reference would have to disclose)

Under 35 U.S.C. § 102, anticipation requires a single reference disclosing every limitation, arranged as claimed. Based on the independent-claim set previously reconstructed (claims 1, 20, 39, 58, 77 — unconfirmed wording, per the summary), a § 102 reference must disclose all of:

1. A handheld / free-space pointing device;
2. A motion sensor producing a motion output (and, in claims reciting it, a second sensor — the indepenent claims as reported recite the accelerometer plus at least one other sensor);
3. An accelerometer producing an acceleration output;
4. Determination of how the device is held (orientation/tilt) from the acceleration output — e.g., θ = atan2(y, z);
5. Application of a two-dimensional rotational transform to the motion output (the 2×2 matrix [cosθ sinθ; −sinθ cosθ] of Eq. 8) to compensate for that orientation; and
6. An output that is substantially independent of how the device is held.

None of the four references above (A–D) discloses elements 4–6 in a single document. The novelty of the '611 claims, if any, resides precisely in that conjunction — inertial-frame/bodily-frame transformation driven by an accelerometer-derived tilt, not in 3D pointing per se (which was old) nor in shaft encoders (which were old).

Practical consequence for a § 102 attack: you would need a single pre-Apr-30-2004 reference that already computed device tilt from accelerometer data and rotated the sensed motion signal accordingly. Candidates in the broader 2004 art that typically get raised in this family (e.g., inertial-tracking work of Foxlin, and accelerometer gesture/motion publications) are § 103 combination material, not clean § 102 art — a point that matches the litigation history: the Hillcrest v. Nintendo actions were settled in 2009 with no merits/validity ruling.

4. Important: family members are NOT prior art

Items that appear alongside "7414611" in citation graphs but are co-family (same priority, Apr. 30, 2004) and therefore cannot be § 102 prior art to the '611 patent: US 7,158,118; US 7,262,760; US 7,489,298; US 7,489,299; US 7,535,456; US 8,072,424; US 8,629,836; US 8,937,594; US 9,298,282; US 9,946,356; US 10,782,792; and publications US 2005/0243062 A1, US 2005/0253806 A1, US 2006/0028446 A1, US 2007/0049374 A1 (Ikeda), US 2007/0091068 A1. Do not cite these as prior art. (Note: US 2005/0253806 A1, Liberty et al., published Nov. 17, 2005, is routinely cited as prior art against third-party applications — see the WO2010095069A1 search report above — but it is Hillcrest's own co-pending publication and is not prior art against '611.)

5. Bottom line

• Most relevant cited reference: US 5,440,326 (Quinn) — confirmed to be discussed in the '611 specification; it is the canonical prior 3D-pointer (mechanical gyroscope + gimbals + shaft-angle encoders).
• Other references I can tie to the record: US 5,138,154 (shaft-angle encoder) and US 4,839,838 (spatial input apparatus) — both component/general-state-of-the-art references, and US 5,898,421 (possible gyroscopic-pointer reference, cluster-corroborated but unverified).
• § 102 result: None of these anticipates claims 1, 20, 39, 58, or 77, because none discloses the combination of (i) an accelerometer used to determine the device's held orientation and (ii) a two-dimensional rotational transform of the motion signal to make cursor motion grip-independent. They are, at most, § 103 general-art references.
• Verification needed: the complete and certified (56) References Cited list (U.S., foreign, and NPL) from the '611 front-page PDF or the application 11/820,517 file wrapper. I could not retrieve it in this session, and I am not going to represent a reconstructed list as the examiner's actual citations.

If you want, I can re-run targeted retrieval (front-page PDF via patentimages, the IFW "References Cited" / PTO-892, and the Espacenet/Global Dossier equivalent) to firm up the list — I was cut off before completing that, and that is the single remaining gap in this analysis.

I'll ground this § 103 analysis in the prior-art references tied to this patent's page and family, then build combinations.

Now let me verify the content of key cited references so the combinations are grounded.

Let me verify a few more cited references (Glynn, Hall, Dunker, Noguera) to ground the combinations.

Obviousness Analysis — U.S. 7,414,611 B2 under 35 U.S.C. § 103

Prepared: April 26, 2026 | Application: 11/820,517 | Priority: 2004‑04‑30 (prov. 60/566,444) | Pre‑AIA § 103(a) governs (application filed 2007‑06‑20, well before the AIA's 2013‑03‑16 changeover).

0. Updating the prior sections' open items (no contradictions — one resolution)

The Patent Summary and PTAB sections both carried an uncertainty flag because the authoritative full text supplied stops mid‑sentence in the Detailed Description and contains no claims. That flag is now resolved: two independent mirrors of the printed grant (uspto.report/patent/grant/7414611 and Insight/RPX, https://insight.rpxcorp.com/patent/[US7414611B2](/patent/US7414611B2)) reproduce the identical claim set — 95 claims, independents at 1, 20, 39, 58, 77, in means‑plus‑function form with the "two‑dimensional rotational transform" limitation. The earlier caveat ("treat the claim language as likely but unconfirmed") can be retired; the substance could be confirmed even if I could not reach USPTO Patent Center itself.

Two database discrepancies to log (not auto‑corrected, per rule):

• Priority date: Google Patents and uspto.report show 2004‑04‑30; Unified Patents' page for US‑7414611‑B2 shows 2004‑04‑29. I use 2004‑04‑30 (provisional 60/566,444) throughout; the one‑day delta is immaterial to every ground below.
• Status/assignee: Google Patents says "Expired – Lifetime" (anticipated expiration 2025‑05‑02) and DRNC Holdings; RPX says "Active Grant"; uspto.report says "currently assigned to Hillcrest Laboratories." These are mirror‑staleness artifacts. None affects § 103.

1. The claim is narrow, and its narrowness is what makes it vulnerable

Construing claim 1 under § 112(f) (pre‑AIA ¶ 6), it requires only five functional blocks:

Claims 20/39/58/77 are the method/handheld/split‑architecture/method counterparts of the same five ideas. Critically, the claims do not require: any particular sensor technology (dep. 3–6 recite camera, rotational sensor, magnetometer, optical sensor as alternatives); any particular transform mathematics (dep. 13–15 merely say the transform may act on translational, rotational, or both); tremor suppression, stationary detection, the ACTIVE/INACTIVE state machine, quaternion/DCM formulations, or the temperature‑dependent offset of the specification — all of that rich disclosure is unclaimed in the '611. The asserted novelty sits almost entirely in element (c)+(d): derive roll from the accelerometer's gravity vector, then rotate the sensed rates by a 2×2 matrix.

That is a result‑oriented, functionally claimed combination of two well‑known operations — measuring an attitude angle from gravity, and rotating a 2‑vector — performed on a device whose motion‑to‑cursor mapping was already old.

Level of ordinary skill (POSITA). A worker with a B.S. in EE/ME/CS plus 2–4 years in inertial sensing or computer input devices, familiar with (i) MEMS gyroscopes/accelerometers, (ii) body‑frame vs. inertial‑frame kinematics, and (iii) the pre‑2004 free‑space pointing literature (Quinn, Gyration, LaBiche, Glynn, Shibata).

2. The prior art in play (from the '611's own face and family listings)

The '611 grant recites a References Cited list that itself supplies most of what is needed (per uspto.report and the '118 sibling's printed list at patentimages.storage.googleapis.com/8a/42/82/84b76cba9d586f/US7158118.pdf). The load‑bearing items:

Additional prior art worth pulling (surfaced from the family/"similar documents" listings, not yet text‑verified): WO 2003/107260 A3 (mouse with rotation‑detection device about a third axis and a rotation‑evaluation device generating the control signal); JP H07‑271508 A ("Input device using azimuth/tilt sensor"); EP 1 332 778 A2 (Sega); JP H11‑253656 (Omron). These are flagged as leads requiring full‑text pulls, not as verified grounds.

⚠️ Not prior art — exclude: every member of the Liberty family itself ('118, '760, '424, '836, '594, '282, '356, '792), the copending 11/119,987 / 11/119,688 / 11/119,663 applications, and EP 2 304 528 B1 (Movea, 2008 priority). The Movea specification is nonetheless interesting as state‑of‑the‑art evidence: its ¶[0003] calls the published Liberty application US 2005/243062 a "prior art" roll‑compensated pointing device. That is a post‑dated admission, useful for context, not a § 103 reference.

3. Ground A (strongest): Quinn '326 in view of LaBiche '838, further in view of Glynn '181

Proposed rejection: claims 1, 2, 4, 7–9, 12–19, 20, 21, 23, 26–28, 31–39, 39–57, 58–76, 77–95 obvious.

Why a POSITA would combine — articulable rationales (KSR; MPEP 2143.01):

1. The problem was known and the solution space was small. Quinn itself frames the goal as transforming an inertial element's indication of rotation "relative to an inertial axis" into cursor coordinates. Once the user may roll the device, the body‑frame mapping produces skewed cursor motion — a recognized, articulable problem (and one the '611's own Background concedes: "if the user holds the device on its side and moves the device left to right, the cursor will move vertically, not horizontally"). Where the problem is known and there is a finite number of predictable solutions, the combination is obvious (KSR Int'l v. Teleflex, 550 U.S. 398, 421 (2007)).
2. Express art suggestion to substitute. Quinn states gyroscopes "provide a known technique for measuring roll and pitch relative to a gravity vector" and that "the gravity vector is approximated by a pendulous device." Replacing that mechanical gravity reference with an accelerometer‑measured gravity vector is the substitution the art itself signposts. Quinn additionally disparages the incumbent technology ("gyroscopes are typically heavy and expensive"), supplying a design incentive to adopt low‑cost MEMS accelerometers — the same "market forces / design incentive" rationale the Supreme Court endorsed in KSR.
3. Reasonably expected to succeed / predictable result. Computing θ = atan2(y, z) from a two‑axis accelerometer, low‑pass‑filtering it for gravity, and multiplying a 2‑vector by a 2×2 rotation matrix is textbook trigonometry and elementary to a POSITA in inertial navigation. The '611's own specification treats the LPF (624) and the matrix (Eq. 8) as conventional building blocks — no new hardware, no unexpected result.
4. No teaching away. Quinn criticizes heavy/expensive gyroscopes and ultrasonic ranging; nothing in Quinn, LaBiche, or Glynn discourages deriving attitude from an accelerometer. Deferential use of a gravity reference is the opposite of teaching away.

Secondary/additional ground for the same claims: Shibata '831 in view of Glynn '181. Shibata supplies a handheld 3‑D input device with an inertial angular‑velocity sensor and explicit axis‑to‑axis ("Eulerian") conversion of angular data, plus a 3‑D‑to‑display mapping. Glynn supplies accelerometers and the express gravitational‑compensation function. Motivation: Shibata's own axis‑coupling concern invites a fixed reference; Glynn gives gravity as that reference.

4. Ground B: Case '350 in view of LaBiche '838 (dependent claims 17/56/74/93 and the processing architecture)

Case's Gyration‑era disclosure anticipates the pre‑compensation dependents almost verbatim: a microprocessor that "estimates bias offsets of the gyroscopes to remove the effect of those offsets from the movement data" (→ claims 17, 36, 56, 74, 93, "compensating … for offset bias") and thresholds that "minimize unintentional cursor movement." LaBiche's A/D conversion and "raw acceleration signals … converted into the desired … signals" (→ claims 18, 37, 57, 75, 94, "converting … into different units"). Architecture dependents (2, 21, 59, 78 — processing in the handheld or a system controller/remote host) are met by Quinn's interface box 185 ("translates signals … into serial data"), Glynn's wireless link with the computer performing the computations, and LaBiche's teaching that "measurements … are transmitted to an external module for processing, or proceed within the hand‑held module."

5. Ground C: mundane dependents — design choices, not inventions

6. Anticipated Patent‑Owner arguments, and why they are weak (but not empty)

1. "The prior art teaches correcting the accelerometer for gravity, not rotating the gyro data by a gravity‑derived angle." This is the strongest argument, and it is a labeling argument. LaBiche and Glynn both derive/eliminate gravity in a body‑frame coordinate system; the '611 merely performs the algebraic complement of the same computation (rotate the measurement into the gravity frame rather than subtract gravity from the measurement). Both the specification and the claim treat the transform as a means to a result ("substantially independent of said orientation"); a POSITA would recognise the two operations as inverses producing identical cursor behaviour. Still, if the Board/ court read "two‑dimensional rotational transform on said first output" as requiring the mathematical rotation of the rate signal specifically, Ground A must be buttressed with a reference that expressly rotates sensor outputs (e.g., WO 2003/107260, or a U‑turn to the art's standard body‑to‑inertial DCM/quaternion practice).
2. "The examiner already considered these references." True — LaBiche '838, Glynn '181, Olson '051, Hotchner's '154/'784, Hall '623, Case '350 and Quinn '326 all appear on the '611 face — so this is a § 325(d)-flavoured "art already considered" fight, not a clean new‑art hit. That raises the bar a challenger must clear but does not bar the ground; the references on the face appear to have been cited as background, not applied in the element‑by‑element orientation‑compensation arrangement asserted here.
3. Secondary considerations. There is no objective‑indicia record: no nexus evidence, no unexpected results, no licensing‑because‑of‑the‑'611, no praise specific to the tilt‑compensation claim (the Nintendo settlement was global and confidential, and produced no finding of validity or infringement — see Litigation section). The commercial success of the Wii-era market belongs to Nintendo's product, not to the '611's claim scope, and any nexus argument is undercut by the pre‑2004 pendulous‑compensation of Quinn, which addressed the same user problem by other means.
4. § 112(f), not § 103. The earlier sections flagged indefiniteness/lack‑of‑corresponding‑structure risk for the means‑plus‑function claims. That remains a separate invalidity theory; I do not import it into the § 103 analysis. (Ironically, the § 112(f) construction narrows claim 1 toward the disclosed algorithm, which helps the challenger on the § 103 side by removing over‑broad functional breadth.)

7. Confidence and limits (stated plainly)

• High confidence on the claim text now that two mirrors agree, and on the content of Quinn '326/'421, Glynn '181 and Case '350, which I verified from primary‑equivalent sources.
• Medium confidence on LaBiche '838 and Shibata '831: the LaBiche quotations above come from a PTAB petition's characterisation of LaBiche, not from LaBiche itself; the Shibata "Eulerian conversion" snippet was truncated in the mirror I reached. Both must be pulled in full text (USPTO Patent Center / Google Patents PDF) before any ground is filed — particularly LaBiche, which is the linchpin of Ground A.
• Low confidence / unverified on Hall '623, Dunker '551, Noguera 2004/0239626, WO 2003/107260 and JP H07‑271508 — cited here by title or search‑report position only. I ran out of tool calls before text‑verifying them.
• No contradiction found between this analysis and the prior sections. Note for the record the two mirror discrepancies in § 0 (priority date 04‑29 vs 04‑30; "Expired" vs "Active Grant" vs "Hillcrest"), flagged rather than corrected per the operating rules.
• Practical bearing: because no IPR/PGR was ever filed and no court adjudicated these claims (PTAB section: 0 proceedings; Litigation section: 2008–09 settlement only), no estoppel and no prior construction constrain the grounds above. But since term expired 2025‑05‑02 (Google Patents "Expired – Lifetime"), a § 103 attack today buys past‑damages relief only — the incentive question, not the merits, is likely to decide whether anyone runs these grounds at all.