US 7158118

I'll search for current USPTO records and any CAFC 2026 docket activity for this specific patent number.

Let me check specifically for CAFC 2026 docket activity and any reexamination/appeal records.

Patent Summary — US 7,158,118 B2

Search scope note: I searched for this specific patent number (7158118 / 7,158,118) against USPTO/PTAB records and Federal Circuit docket coverage. I found no CAFC 2026 docket activity for this patent number (see §5). Below is what is confirmed from the authoritative full text, Google Patents/Justia records, and the ITC/USPTO sources retrieved. As instructed, I interpreted the number literally and did not merge it with similar numbers (e.g., 7,158,148) or with family members (7,262,760; 7,414,611; 7,139,983).

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1. Bibliographic data (confirmed)

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2. Abstract (verbatim from the patent)

"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."

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3. Plain-language overview of the independent claims

The patent has three independent claims — claim 1 (method), claim 9 (handheld pointing device), and claim 12 (3D pointing device). (Note: an earlier internal draft of this analysis inferred the apparatus claim was claim 1; that inference is superseded — claim 1 is the method claim.)

Claim 1 — Method for using a 3D pointing device

In plain terms:

• Detect movement of the 3D pointing device (e.g., from rotational sensors).
• Compensate that movement by transforming it from the device's own "body" frame of reference into an inertial frame of reference, specifically by determining a tilt associated with how the user is holding the device, and then correcting for that tilt.
• The correction is done by rotating the first and second rotational outputs into the inertial frame using a specific 2×2 trigonometric rotation:
  R = [ cos θ sin θ ; −sin θ cos θ ] · [ αy ; αz ], where θ is the tilt, and αy and αz are the first and second rotational outputs.
• (Dependent claims add: feeding the compensated movement to a user interface; determining tilt from an accelerometer output; using any of rotational sensor/accelerometer/gyroscope/optical sensor/magnetometer/camera; intermediate frames; and transforming in x, y, z, in a subset, or for translation/rotation only.)

Bottom line: compute the device's tilt and mathematically rotate (de-tilt) the gyro channels so the pointer responds to the user's frame, not the device's orientation.

Claim 9 — Handheld pointing device (the sensor-apparatus claim)

In plain terms, a handheld pointer comprising:

• a first rotational sensor (rotation about a first axis → first rotational output);
• a second rotational sensor (rotation about a second axis → second rotational output);
• an accelerometer (→ acceleration output); and
• a processing unit that (a) converts all three outputs from a body frame into a user's frame of reference to remove tilt effects caused by how the device is held, and (b) determines x/y data associated with screen-cursor movement from the converted outputs —
• wherein the conversion makes the cursor movement substantially independent of the orientation in which the user holds the device.

Bottom line: the hardware-plus-firmware embodiment — two gyros + accelerometer, all transformed into the user's frame so the cursor moves the same way regardless of grip.

Claim 12 — 3D pointing device (the broad "at least one sensor" claim)

In plain terms:

• at least one sensor for detecting movement of the 3D pointing device, plus
• a processing unit that compensates the detected movement by transforming it from a body frame of reference into an inertial frame of reference — again by determining tilt and rotating the first/second rotational outputs into the inertial frame by calculation.

Bottom line: the broadest apparatus framing — one or more sensors, with firmware doing the body→inertial frame transformation.

Scope observation: the patent's own specification calls the tilt-compensation embodiment "a subset of a more general technique for translating sensor readings from the body frame of reference into a user's frame of reference," which is relevant to the breadth of claims 1 and 12.

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4. Litigation / assertion history (confirmed)

• ITC Inv. No. 337-TA-658 and D. Md. 8:08-cv-02188, Hillcrest Laboratories, Inc. v. [Nintendo Co., Ltd.](/litigations/by-plaintiff/Nintendo%20Co.%2C%20Ltd.) et al. — filed Aug. 20, 2008; claims 1–4 of the '118 were among those asserted against Nintendo's Wii (with U.S. 7,139,983; 7,262,760; 7,414,611). ITC instituted Sep. 16–17, 2008 (ALJ Paul Luckern). Settled/terminated 2009 — ALJ ID terminating the investigation issued Sep. 8, 2009; Commission determined not to review on Sep. 28, 2009; no exclusion order; no merits ruling on infringement or validity.
• Inter partes reexamination of U.S. 7,158,118 request filed July 13, 2012 (a third-party challenge to then-owner Hillcrest). ⚠️ I could not retrieve the resulting reexamination certificate or confirm whether the claims were amended (see §6).

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5. CAFC 2026 docket check — result

No Federal Circuit 2026 docket activity was found for US 7,158,118. My searches for a 2026 CAFC appeal or brief citing "7158118" / "7,158,118" returned nothing matching; the only Federal-Circuit-adjacent hits were unrelated PTAB petition papers listing the patent number among prior-art search strings. The patent's only merits-adjacent dispute (Nintendo) settled in 2009 before any appealable judgment, so there is no adjudicated Federal Circuit decision to report.

Caveat (explicit): I was cut off from completing all intended searches, and the CAFC's own docket system (PACER/CM-ECF) is not fully renderable through my search tool. I cannot give a definitive negative for every 2026 filing; treat this as "none found," not "verified none."

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6. Uncertainty / items I could not authoritatively confirm

1. Claim text may be amended. The claim-1 and claim-12 texts retrieved (e.g., the "wherein … by calculating [matrix]" limitation) do not track the specification's Summary phrasing. Given the July 13, 2012 inter partes reexamination request, the retrieved text may be post-amendment. Verify the verbatim as-issued claims (and any reexamination certificate) at USPTO PatentCenter.
2. Reexamination outcome unknown. I could not retrieve the reexamination certificate or confirm whether any claim of the '118 was amended/confirmed/cancelled.
3. No CAFC 2026 docket confirmed — flagged as a search limitation, not a certainty.
4. Assignee chain (per Google Patents): Hillcrest Laboratories → IDHL Holdings, Inc. (recorded 2017-06-05) → DRNC Holdings, Inc. (recorded 2023-04-13). I did not verify reel/frame numbers for these recordings.
5. One search hit characterized a "'118 patent" as covering LED-driver circuits — that is a different patent abbreviated to its last three digits and is not this patent; I did not auto-correct it, merely excluded it.

I'll research litigation involving US 7,158,118 across the sources you named, plus PTAB/CAFC and PACER-adjacent dockets.

Let me check for any later assertions (IDHL/DRNC era) and any Federal Circuit activity.

Litigation Involving U.S. Patent No. 7,158,118

Scope note / date flag. You set the current date as April 26, 2026, while the earlier sections of this analysis were run under a 2026-09-29 stamp. I flag the inconsistency rather than silently reconcile it; nothing below depends on it. I searched the patent-litigation aggregators you named (Unified Patents portal, Stanford NPE Litigation Database), Google Patents' litigation feed, the ITC's Federal Register notices, Justia Dockets, and secondary news/legal sources. I could not query PACER or the CAFC docket directly, so those are covered only through secondary reporting. Per your strict rule, I ran the query on the literal string 7158118 and excluded hits for other patents that abbreviate to "'118" (see the exclusion note at the end).

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Bottom line

Only one litigation campaign is known against US 7,158,118, and it comprises two parallel proceedings (a district-court suit and an ITC § 337 investigation) brought by the then-owner, Hillcrest Laboratories, Inc., against Nintendo over the Wii console/remote. Both ended in a confidential settlement in 2009 — no merits ruling. No subsequent litigation by the later owners (IDHL Holdings or DRNC Holdings) naming 7,158,118 was found. The Stanford NPE Litigation Database's patent-specific page for 7158118 (https://npe.law.stanford.edu/patent/7158118) lists exactly one case — the 2008 Maryland action below.

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Case 1 — District court

Case 2 — ITC § 337 investigation (companion)

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Cases searched for and NOT found

• No later district-court or ITC action naming 7,158,118 by the current owner DRNC Holdings, Inc. or its predecessor IDHL Holdings, Inc. My searches for DRNC/IDHL enforcement involving this patent returned only patent-prosecution and portfolio records (e.g., IDHL-assigned continuations such as US 10,514,776 and US 11,157,091, and the '118's own continuations), not litigation asserting the '118.
• No Federal Circuit appeal of any 7,158,118 judgment — consistent with the case having settled before any appealable merits decision. (Caveat: the RPX patent page carries a "DC CAFC" provenance tag implying some Federal Circuit touchpoint in the portfolio's history; I could not tie any CAFC docket to the '118 itself. I flag the tension rather than resolve it.)
• No PTAB litigation (covered in the earlier PTAB section — zero AIA trials).

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Related (non-litigation) adversarial proceeding — flagged for completeness

• Third-party inter partes reexamination request against U.S. 7,158,118, reportedly filed at the USPTO on July 13, 2012 (referenced in the file history of sibling US 9,261,978). This is a post-grant USPTO proceeding, not litigation, and I could not retrieve its outcome (e.g., any reexamination certificate or claim amendments). It is the only other formally adversarial event against the patent.

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Exclusion note (similar-number hits I discarded)

Several search hits concerned other patents abbreviated to a "'118" or coincidentally numbered near 7158118 — e.g., the Apple v. Samsung '715 patent (US 9,880,715, re LiTL/Lenovo and Netflix IPR material), and an LED-driver patent discussed in a PTAB petition. None of these involve US 7,158,118 and I have excluded them, per your instruction not to return results for similar numbers.

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Source list

• Google Patents litigation feed for US7158118B2: https://patents.google.com/patent/US7158118/en
• Justia Docket, Hillcrest Laboratories, Inc. v. Nintendo Co., Ltd. et al, 8:2008cv02188 (D. Md.): https://dockets.justia.com/docket/maryland/mddce/8:2008cv02188/[161113](/patent/161113)
• Stanford NPE Litigation Database, patent 7158118 (lists only the Nintendo case): https://npe.law.stanford.edu/patent/7158118
• ITC Notice of Investigation, 337-TA-658 (Sept. 17, 2008): https://www.usitc.gov/secretary/fed_reg_notices/337/337-ta-658.institution.1221682945_0.pdf
• ITC termination notice, 74 FR 50821 (Oct. 1, 2009): https://regulations.justia.com/regulations/fedreg/2009/10/01/E9-23593.html
• ITC amendment notice, 74 FR (Feb. 27, 2009): https://www.govinfo.gov/content/pkg/FR-2009-02-27/pdf/E9-4157.pdf
• Finnegan case description (337-TA-658, settled before ALJ ID): https://www.finnegan.com/en/work/experience/certain-video-game-machines-and-related-three-dimensional-pointing-devices-hillcrest-laboratories-v-nintendo-337-ta-658-itc.html
• Patent Arcade case update (dismissed with prejudice Oct. 16, 2009): http://patentarcade.blogspot.com/2008/08/news-nintendo-sued-over-wii-again.html
• Hillcrest press statement (Aug. 20, 2008): https://amlawdaily.typepad.com/amlawdaily/files/Hillcrest_Nintendo.pdf
• Bloomberg, "Nintendo Ends Trade Fight Over Wii Video-Game System" (Aug. 24, 2009) — reports civil suit number as 08cv2199

Verification caveat: Because I could not reach PACER or the CAFC docket system, and because the aggregators disagree on the district case number (8:08-cv-02188 vs. 08cv2199), confirm both the docket number and the absence of any post-2009 action directly in PACER (D. Md.) and via the CAFC docket before relying on this in a filing.

I'll research this. The structured block says ODP has no AIA trials indexed, but let me verify with web searches since this patent family had significant litigation.

The searches so far show district court and ITC activity but no PTAB trials yet. Let me dig specifically for AIA proceedings.

No PTAB hits yet. Let me check the later Hillcrest/IDHL assertion campaigns (Roku, LG, Samsung, etc.) which are the most likely to have generated IPRs.

Proceedings overview

Total AIA trial proceedings on US7158118: 0. No IPR, PGR, or CBM petition has ever been instituted against this patent on the record before me — the USPTO Open Data Portal returns an empty AIA-trial list, and my web searches surfaced no petition, institution decision, or Final Written Decision for 7,158,118. The breakdown by status is therefore 0 active / 0 claims invalidated by the Board / 0 claims sustained by the Board / 0 settled at the PTAB / 0 institution denials. Bottom-line defensive posture: this is not a "hardened after surviving IPRs" patent and not a "claims already canceled" patent — it is a PTAB-virgin patent whose only validity testing was in district court/ITC, where the case settled without any merits ruling. Because the disclosure block's canonical ODP list is empty and my independent searches corroborated that, I treat "no PTAB activity on file" as the finding, with the important caveat below.

⚠️ Two caveats you should weigh before relying on this. (1) I was cut off from further searches before I could exhaustively sweep the later Hillcrest/IDHL assertion campaigns; I could not positively confirm every petition ever filed. (2) The absence of PTAB activity is itself a defining feature of this patent's history and is explained by the fact that its one marquee assertion (Nintendo/Wii) settled before any validity adjudication — see the litigation context below.

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No AIA proceedings — the closest analog is the 2008–2009 litigation

Since there is no {PROCEEDING_NUMBER} to populate, here is the proceeding that would have generated an IPR had it gone the distance:

ITC Inv. No. 337-TA-658 / D.Md. 8:08-cv-02188 — Hillcrest Laboratories, Inc. v. Nintendo Co., Ltd. et al.

• Type: Not an AIA trial. Parallel ITC § 337 investigation and district-court patent infringement action.
• Filed: 2008-08-20 (complaint filed in D.Md.; ITC complaint filed same day, per Hillcrest's press release). ITC instituted the investigation on 2008-09-17.
• Status: Terminated by settlement — not a merits disposition. The parties notified the ITC on 2009-08-21 that they had settled and moved to terminate; Chief ALJ Paul Luckern granted the motion.
• Judge panel: N/A (no APJs). D.Md. presiding judge: Roger W. Titus. ITC: Chief ALJ Paul Luckern.
• Petition/assertion grounds: Hillcrest asserted four patents against the Wii console and Wii Remote — US 7,158,118, US 7,262,760, US 7,414,611 ("3D Pointing Devices with Orientation Compensation and Improved Usability" family) and US 7,139,983 (navigation-interface display). Hillcrest sought an ITC exclusion order and cease-and-desist order against importation of the Wii.
• Institution decision: The ITC instituted the investigation; the ALJ never reached a final initial determination on infringement or validity because the case settled first.
• Final Written Decision: None. No claim of 7,158,118 was ever canceled, confirmed, or construed on the merits by any tribunal.
• Settlement / termination: Settled 2009-08-21. Hillcrest dropped all patent claims against Nintendo; the agreement contains a "License Grants" section. Most terms were redacted in the public version, so the license scope/financials are confidential. The settlement expressly states it is not a ruling on the merits of Hillcrest's claims or Nintendo's liability.
• Appeal: None — the case ended at settlement before any appealable judgment.
• Defensive value: Minimal either way. A settlement is neither a validity win nor a validity loss. Critically, it means no PTAB or court has ever construed the claims of 7,158,118, and there is no IPR estoppel and no issued claim-construction to leverage. A defendant today cannot point to any canceled claim, but also gets no free pass — the patent has simply never been stress-tested.

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Strategic summary

Claim status — all claims UNTESTED. No claim of 7,158,118 has been canceled, confirmed, or even construed by the PTAB or a court. The claim set is therefore fully intact on paper, including the independent claims directed to a handheld pointing device with first/second rotational sensors plus an accelerometer and a processing unit that transforms the outputs "from a body frame of reference … into a user's frame of reference." There are no surviving-after-IPR narrow claims to map around, and correspondingly no dead claims to attack. The validity record is a blank slate.

Estoppel landscape — nothing bars you, and nothing bars the patent owner either. Because there is no institution and no FWD, § 315(e)(2) estoppel never attached to any party. For a defendant being asserted against today, every prior-art ground is theoretically available — § 102/§ 103 challenges to any claim, plus § 112 grounds where applicable. The flip side: Hillcrest/IDHL (and its predecessors, and Nintendo under the 2009 license) are not estopped from re-litigating anything, so you cannot use a prior loss to short-circuit the patent owner. Note also that any petition you file now faces zero estoppel baggage but also no "second-bite" protection — you get one clean run at the Board.

Pattern signals. (a) No serial petitioner has ever sued this patent at the PTAB — the same-petitioner-multiple-IPR pattern is absent. (b) The patent owner did not pursue PTAB appeals, because there was never a Board decision to appeal. (c) There is no defensive aggregator (no Unified Patents/IPR-style) challenge in the chain that I could identify; the only recorded adversarial event is the Nintendo litigation, which settled. (d) Ownership has moved down the chain: Hillcrest Laboratories → IDHL Holdings, Inc. (2017-06-05) → DRNC Holdings, Inc. (2023-04-13), with intervening security interests (Hercules Technology III, Multiplier Capital). That assignment history — a patent-holding entity absorbing the portfolio after the operating company wound down — is a classic monetization signal, so renewed assertion activity is plausible. (e) The patent's term has run. Google Patents records an anticipated expiration of 2025-05-02 and legal status "Expired – Lifetime." As of today (2026-09-28) the patent is expired.

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Recommended next steps

1. There is no FWD to link to or quote — I will not manufacture one. If you need a dispositive source, the operative documents are the D.Md. docket (8:08-cv-02188, https://dockets.justia.com/docket/maryland/mddce/8:2008cv02188/[161113](/patent/161113)), the ITC investigation 337-TA-658, and the Nintendo/Hillcrest settlement (reported publicly; terms largely redacted). There is no PTAB E2E or CourtListener opinion for this patent because no AIA trial exists.
2. Run the clock and the damages window first. The patent expired 2025-05-02. Any live controversy can only concern past damages for pre-expiration infringement, and the § 286 six-year lookback cuts the recoverable period. If the demand letter you received is aimed at ongoing conduct, that theory is weak on its face — flag it.
3. If a demand letter cites 7,158,118, do not assume it is dead — assume it is unbuilt. Because no tribunal ever construed these claims, your best early investment is a claim-construction and invalidity scouting report (§ 102/§ 103 against the rotational-sensor + accelerometer + frame-transform limitations) rather than attack work keyed to an existing FWD. There is no estoppel limiting your art, so a well-prepared IPR remains available if a district case matures — though note the 1-year § 315(b) bar from service of a complaint, and that an expired patent still permits IPR review of claims (the Board can institute on an expired patent, but motivation to do so drops sharply).
4. Verify independently before filing anything. My searches were cut short of a fully exhaustive 2018–2024 IDHL/DRNC enforcement sweep (there is known post-2017 assertion activity in the consumer-electronics/TV space). Before you rely on the "zero PTAB proceedings" conclusion in a brief or opinion, confirm it directly against PTAB E2E (https://ptacts.uspto.gov/ptacts/) and the ODP AIA-trial endpoint for both 7,158,118 and its continuation siblings 7,262,760 / 7,414,611 / 8,072,424 / 8,629,836, since a petitioner sometimes challenges a sibling rather than the exact patent in suit.
5. Settlement leverage note. The one comparable dispute (Nintendo) resolved with a license, not a validity loss. If you are facing DRNC/IDHL, expect a licensor posture and a portfolio-level ask spanning the 7,158,118 family — not a single-patent fight.

Bottom line: No PTAB proceedings exist on US7158118. The absence is a real signal — a patent this widely asserted (Wii-era, plus the 2017+ TV/streaming campaigns) that never attracted a single instituted IPR suggests either that targets settled early or that the family's assertion targets resolved commercially. For a defendant today, the patent is expired, never adjudicated, and carries no estoppel — a genuinely open field for a validity challenge, but with zero pre-built claim-construction or cancellation wins to lean on.

I'll start by gathering the assignment-record specifics that Google Patents' legal-events feed doesn't expose (reel/frame, correspondent).

Strong leads. Let me pin down the reel/frame records, the IDHL/DRNC chain, and the litigation timeline.

Ownership & Assignment Analysis — US 7,158,118 B2

Scope note / data-quality caveat up front. My authoritative fetched source for this patent is the Google Patents page, whose "Legal Events / reassignment" feed gives dates, conveyance types, assignors and assignees but omits reel/frame numbers and the correspondent of record. The USPTO Assignment Center (assignmentcenter.uspto.gov) and assignment.uspto.gov are JavaScript applications that my search tool could not render, and the USPTO PTAB/assignment PDFs I did reach did not expose the reel/frame for this chain. I was therefore unable to verify reel/frame numbers or correspondent attorneys for most links, and I have not fabricated any. Each entry below cites what is actually documented; the reel/frame fields are flagged as unavailable. Verify at the Assignment Center search page before relying on this for filing.

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Inventors

Pattern notes:

• Single-inventor patent. A foundational, heavily-asserted 3D-pointing patent with only one named inventor is itself notable — it concentrates inventorship (and any §102/§115 standing questions) in one person, and Liberty is a repeat Hillcrest inventor across the sibling applications (Ser. Nos. 11/119,987; 11/119,688; 11/119,663) identified in the specification.
• No evidence of inventor departure within 12 months of filing. The 2005-06-21 recording of the Liberty→Hillcrest Communications assignment (recorded ~7 weeks after the 2005-05-02 filing) is a standard employee-inventor assignment, not a fire-sale precursor. I found no record of Liberty leaving before the 2008–2009 Nintendo litigation, in which Hillcrest's technical story rested on this family.
• Caveat: I could not confirm each inventor's employment via a primary HR/10-K source; the "employer" column is inferred from the assignee-of-record.

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Original assignee

• Entity named on the issued patent: Hillcrest Laboratories, Inc. (originally incorporated/recorded as Hillcrest Communications, Inc., changed to Hillcrest Laboratories, Inc. by recorded Change of Name on 2006-01-12). Address of record in the ITC filing: 15245 Shady Grove Road, Suite 400, Rockville, Maryland 20850.
• Primary line of business: consumer 3D/“free-space” pointing and TV user-interface software. Founder-led (Dan Simpkins). Products/technology in commerce included the Loop pointer (a handheld motion remote), the Kylo TV web browser, and MotionEngine motion-processing software licensed to OEMs. Hillcrest publicly stated it held 29 patents worldwide and had filed for 100+ related applications, and that “leading consumer electronics companies… have already licensed Hillcrest’s technology.” So this was a product-and-license operating company, not a paper holder, at the time of the 2008 suit.
• Assertion posture at the time: On 2008-08-20 Hillcrest filed an ITC §337 complaint (Inv. No. 337-TA-658, Certain Video Game Machines and Related Three-Dimensional Pointing Devices) and a parallel District of Maryland suit against Nintendo, asserting claims 1–4 of US 7,158,118 (plus 7,139,983; 7,262,760; 7,414,611). The Google Patents page lists the Maryland case as 8:08-cv-02188 (Bloomberg contemporaneously reported it as 08cv2199). The ITC case settled 2009-08-21 as a “licensing and settlement agreement.”
• Current status: Operating business sold. Hillcrest Labs’ motion business/team was acquired by CEVA, Inc. (CEVA Technologies, Inc., Mountain View, CA) — corroborated by inventor-assignee linkage (e.g., Hillcrest inventor Bryan A. Cook’s top assignees are IDHL Holdings, CEVA Technologies, and Hillcrest Laboratories). The patent portfolio, however, had already been separated into a non-practicing holding entity in 2017 (see below). The original corporate entity is best described as acquired/absorbed and no longer an independent operating company; I found no bankruptcy filing.

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Assignment timeline

Format limitation: Google Patents’ legal-events feed supplies the dates shown below but not reel/frame or correspondent. “Recorded” dates are as displayed by the source; separate execution dates were not exposed and I will not guess them. Reel/frame = not retrieved unless noted.

• Recorded 2005-06-21 — Reel/frame not retrieved

  • Conveyance: Assignment (assignment of inventors’ interest)
  • Assignor: Matthew G. Liberty
  • Assignee: Hillcrest Communications, Inc.
  • Correspondent: not exposed in source
  • Context: standard employee-inventor assignment of the 2005-05-02 application filed two months earlier.

• Recorded 2006-01-12 — Reel/frame not retrieved

  • Conveyance: Change of Name
  • Assignor: Hillcrest Communications, Inc.
  • Assignee: Hillcrest Laboratories, Inc.
  • Correspondent: not exposed in source
  • Context: internal reorganization only — same corporate person, new name; not a change in beneficial ownership.

• Recorded 2012-04-10 — Reel/frame not retrieved

  • Conveyance: Security Agreement
  • Assignor: Hillcrest Laboratories, Inc.
  • Assignee: Hercules Technology III, L.P. (venture-debt lender, Hercules Technology Growth Capital)
  • Correspondent: not exposed in source
  • Context: securitization — collateral lien, not a transfer of title.

• Recorded 2015-06-12 — Reel/frame not retrieved

  • Conveyance: Release by Secured Party
  • Assignor: Hercules Technology III, L.P.
  • Assignee: Hillcrest Laboratories, Inc.
  • Correspondent: not exposed in source
  • Context: lien release — the 2012 Hercules security interest was paid off/satisfied.

• Recorded 2016-03-01 — Reel/frame not retrieved

  • Conveyance: Security Agreement
  • Assignor: Hillcrest Laboratories, Inc.
  • Assignee: Multiplier Capital, LP (venture-debt lender)
  • Correspondent: not exposed in source
  • Context: securitization — a second collateral lien, suggesting refinancing pressure ahead of the 2017 IP sale.

• Recorded 2017-06-05 — Reel/frame not retrieved

  • Conveyance: Assignment of Assignor’s Interest
  • Assignor: Hillcrest Laboratories, Inc.
  • Assignee: IDHL Holdings, Inc. (Wilmington, Delaware)
  • Correspondent: not exposed in source
  • Context: transfer of the patent portfolio out of the operating company into an IP-holding entity — a monetization/holdco separation, contemporaneous with the Multiplier lien release.

• Recorded 2017-06-05 — Reel/frame not retrieved

  • Conveyance: Release by Secured Party
  • Assignor: Multiplier Capital, LP
  • Assignee: Hillcrest Laboratories, Inc.
  • Correspondent: not exposed in source
  • Context: lien release — clears the collateral so the portfolio can pass to IDHL Holdings.

• Recorded 2017-11-01 — Reel/frame not retrieved

  • Conveyance: Corrective Assignment (correcting the re-recorded Multiplier release)
  • Assignor: Multiplier Capital, LP
  • Assignee: Hillcrest Laboratories, Inc.
  • Correspondent: not exposed in source
  • Context: administrative correction of the June 2017 release; no new economics.

• Recorded 2023-04-13 — likely reel/frame 69800/0653 (candidate, not confirmed for this patent)

  • Conveyance: Assignment of Assignor’s Interest
  • Assignor: IDHL Holdings, Inc.
  • Assignee: DRNC Holdings, Inc. — recorded address 200 Bellevue Parkway, Suite 300, Wilmington, Delaware 19809
  • Correspondent: “PATENT DOCKETING,” 200 Bellevue Parkway, Suite 300, Wilmington, DE 19809 — a corporate docketing department, not a named outside attorney (per the RPX Insight assignment record titled 69800/653, which lists DRNC Holdings, Inc. as assignee at that address with “PATENT DOCKETING” as correspondent). Flag: this is a docketing-desk correspondent rather than a repeat-player NPE attorney, so it does not match the classic “same lawyer, rotating LLCs” pattern. I could not confirm that reel 69800/0653 covers US 7,158,118 specifically (the RPX record shows an asset bundle of 6), so treat the reel/frame as indicative only.
  • Context: transfer to a non-practicing holding entity. DRNC’s recorded address is InterDigital, Inc.’s Wilmington, Delaware headquarters address, and DRNC Holdings, Inc. (Delaware) appears as a subsidiary in InterDigital, Inc.’s Form 10-K Exhibit 21 subsidiary list; Unified Patents lists the “Parent Company” for DRNC-assigned Hillcrest patents as InterDigital. I present the InterDigital relationship as reported/circumstantially supported, not primary-verified in this session.

• Anticipated expiration 2025-05-02 (term end; patent now Expired – Lifetime). A third-party inter partes reexamination request against 7,158,118 was filed 2012-07-13 (a defensive challenge to the then-owner Hillcrest, not an ownership event).

If the Assignment Center shows no additional records beyond the above, that is itself consistent with “original assignee still owns” only up to 2017 — here, by contrast, there is a full recorded chain, so the ownership has genuinely moved.

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Timeline diagram

timeline
    title Ownership of US 7158118
    2004 : Provisional applications filed
    2005 : Nonprovisional filed 2 May 2005
         : Assigned to Hillcrest Communications
    2006 : Renamed Hillcrest Laboratories Inc
    2007 : Patent issued 2 Jan 2007
    2008 : ITC case 337-TA-658 vs Nintendo
    2009 : Nintendo licensing settlement
    2012 : Hercules security agreement
         : Third party reexam request filed
    2015 : Hercules lien released
    2016 : Multiplier Capital security agreement
    2017 : Assigned to IDHL Holdings Inc
         : Multiplier lien released
         : Corrective assignment recorded
    2019 : Hillcrest Labs business to CEVA
    2023 : Assigned to DRNC Holdings Inc
    2025 : Patent term ends 2 May 2025

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NPE / troll-pattern signals

1. Shell-entity transfer — PRESENT (moderate strength).
   The portfolio left the operating company for an IP-holding entity: Hillcrest Laboratories → IDHL Holdings, Inc. (recorded 2017-06-05), and then IDHL Holdings → DRNC Holdings, Inc. (recorded 2023-04-13). IDHL Holdings is a Wilmington, Delaware holding company, and the operating business went separately to CEVA (2019) — i.e., patents were deliberately severed from the products. Strongest tell: DRNC’s recorded address is 200 Bellevue Parkway, Suite 300, Wilmington, DE 19809, an entity address rather than a plant. Weakness: I could not retrieve the reel/frame for the 2017 or 2023 records, nor confirm a registered-agent address or single-member LLC structure, so this rests on the holdco separation + entity address rather than a documented shell registration.

2. Known asserter in the chain — UNCLEAR.
   The current assignee DRNC Holdings, Inc. does not itself appear on the enumerated NPE lists (Acacia, Marathon, IV, IPNav, Wi-LAN, Mosaid/Conversant, Vringo, Pendrell, Innovatio, MPHJ, Lumen View, Round Rock, Document Generation, Spangenberg entities). Its reported parent, InterDigital, Inc., is a public pure patent-licensing company — a non-practicing licensor by business model, but not a listed high-frequency troll. Hillcrest was an operating company. I found no assertion by DRNC/IDHL naming 7,158,118; the only ’118 assertions on record are Hillcrest’s 2008 ITC/Maryland cases (claims 1–4) and the 2012-07-13 third-party reexam. Marked unclear rather than present.

3. Repeat correspondent across the chain — NOT PRESENT (on available evidence).
   The only correspondent captured is “PATENT DOCKETING,” 200 Bellevue Parkway, Suite 300, Wilmington, DE on the DRNC assignment (RPX record 69800/653) — a corporate docketing desk, not a named attorney, so the classic “one lawyer running rotating shell LLCs” signature is not observed. Correspondents for the 2005–2017 links were not exposed in my sources, so a recurrence cannot be ruled out; on what is documented, this signal is absent.

4. Cascading transfers — WEAK / NOT PRESENT.
   The 2017 cluster (assignment 2017-06-05, lien release 2017-06-05, corrective assignment 2017-11-01) is a single refinancing/sale episode, not a chain of unrelated LLCs; the second genuine hop (IDHL → DRNC) came ~6 years later (2023), far outside a 24-month cascade. No shared-correspondent evidence across links.

5. Pre-litigation transfer — NOT PRESENT.
   The 2008-08-20 ITC and Maryland suits were brought by Hillcrest Laboratories, Inc. — the patent’s then-owner and the operating company itself. There is no assignment within 6 months before either the 2008 suit or the 2009 settlement; the nearest recorded event is the 2006-01-12 change of name.

6. Bankruptcy fire-sale — NOT PRESENT.
   No Chapter 7/11 record found for Hillcrest Laboratories, Inc. The 2016 Multiplier Capital security agreement (2016-03-01) followed by the 2017 sale of the portfolio to IDHL Holdings is suggestive of lender-driven monetization, but there is no bankruptcy proceeding and the 2017 lien release (and its 2017-11-01 corrective) shows the secured party was satisfied — not a court-supervised sale.

7. Privateering — NOT PRESENT.
   The subsequent non-practicing holders (IDHL, DRNC) show no recorded assertion on behalf of Hillcrest against Hillcrest’s competitors, and no SEC/Patent-Progress/EFF coverage of such an arrangement was found. Hillcrest litigated in its own name in 2008.

8. Defensive aggregator — NOT PRESENT.
   The chain does not terminate at RPX, AST, LOT Network, Unified Patents, or OIN. Notably, Unified Patents is on the other side (it maintains patent pages and litigation data for this family), and a third-party inter partes reexamination of 7,158,118 was filed 2012-07-13 — i.e., the patent was the target of defensive activity, not acquired by a defensive aggregator.

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Verdict

NPE — moderate confidence.

Justification. The patent is a genuine operating-company invention (Hillcrest Laboratories, Rockville MD; asserted by Hillcrest itself against Nintendo — ITC 337-TA-658 and D. Md. 8:08-cv-02188, asserting claims 1–4 of the ’118, settled 2009-08-21), so the historical assertion was authentic. But the ownership chain then deliberately severed the patents from the operating business: Hillcrest Laboratories → IDHL Holdings, Inc. (recorded 2017-06-05), with the product business separately sold to CEVA (2019), and then IDHL Holdings → DRNC Holdings, Inc. (recorded 2023-04-13) at 200 Bellevue Parkway, Suite 300, Wilmington, DE 19809 — the InterDigital headquarters address, with DRNC Holdings appearing in InterDigital’s Form 10-K Exhibit 21 subsidiary list and Unified Patents listing “InterDigital” as the parent. That constitutes one strong signal (holdco/IP-separation transfer to a non-practicing owner) with several corroborating weak indicators (Delaware holding-company chain, corporate “PATENT DOCKETING” correspondent rather than a named attorney, zero products at the current assignee). It falls short of high confidence because (a) I could not retrieve reel/frame numbers or correspondents for the decisive 2017 and 2023 recordings, (b) DRNC/InterDigital is a public pure-licensor rather than a listed high-frequency plaintiff, and (c) there is no recorded assertion by the current owner — and the ’118 expired 2025-05-02, foreclosing forward assertion.

Verification links:

• USPTO Assignment Center (search by patent number 7158118): https://assignmentcenter.uspto.gov/
• USPTO legacy assignment search: https://assignment.uspto.gov/patent/index.html
• Google Patents legal events: https://patents.google.com/patent/US7158118/en
• ITC 337-TA-658 notice of investigation: https://www.usitc.gov/secretary/fed_reg_notices/337/337-ta-658.institution.1221682945_0.pdf
• RPX Insight DRNC assignment record (69800/653): https://litigation.rpxcorp.com/patent_assignment/67758639

What would move this to “high confidence” or to “not a finding”: pulling the actual reel/frame + correspondent for the 2017-06-05 IDHL Holdings recording and the 2023-04-13 DRNC Holdings recording from the Assignment Center, and checking whether IDHL Holdings and DRNC Holdings share a registered-agent service address or common principals. If those two recordings trace to the same correspondent and the same agent address, the holdco pattern is confirmed; if DRNC resolves to InterDigital’s corporate patent group with no assertion history, the patent is best treated as neutralized/expired rather than an active NPE asset.

I'll research the prior art citations on the face of US 7,158,118 and analyze them under § 102.

Let me pull the front-page "References Cited" list from the patent's FPO/Justia records.

I found the Justia "Referenced Cited" list. Let me get the complete list including foreign documents and non-patent references.

Prior-Art Analysis — U.S. Patent No. 7,158,118 B2

Scope and method. Per the strict instruction, I treated the identifier literally as 7,158,118 and did not substitute or merge any similar numbers. I pulled the references cited on the face of '118 from the Google Patents record and the Justia "Referenced Cited" record for this specific patent number.

Critical sourcing caveat up front (please read before relying on this): I was able to retrieve the U.S. Patent Documents portion of the '118 "Referenced Cited" list, but the retrieved record appears truncated at US 2005/0253806 — I did not recover the patent's Foreign Patent Documents or Other Publications / NPL sections, nor the examiner's actual rejections from the file wrapper (IDS vs. examiner-cited distinction is therefore unresolved). So the list below is substantially complete for U.S. patent references but not verifiably exhaustive. I flag where I am reconstructing titles from memory rather than from the retrieved record.

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1. The § 102 legal frame that applies to this patent

'118 was filed May 2, 2005 (App. No. 11/119,719), claiming priority to provisionals 60/566,444 (Apr. 30, 2004), 60/612,571 (Sep. 23, 2004) and 60/641,410 (Jan. 5, 2005). Because it was filed before March 16, 2013, the pre-AIA version of 35 U.S.C. § 102 governs. This produces three different effective dates that matter for classifying each reference:

This is why several references that issued in 2005–2006 can still be § 102(e) art against '118, while others (the applicant's own co-pending publications) cannot.

A second threshold point: appearing in the "References Cited" list does not make a document anticipatory. On a U.S. patent face, that list mixes (i) examiner-cited art actually used in § 102/§ 103 rejections, (ii) applicant-submitted IDS art never applied, and (iii) the applicant's own family publications. I cannot, without the file wrapper, tell you which bucket each item fell into. The § 102 mapping below is my independent technical assessment, not a report of an actual examiner rejection.

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2. References cited on the face of US 7,158,118 (U.S. patent documents)

(Numbers, dates and inventors as retrieved. Titles marked ✱ are reconstructed from memory and should be verified against the front page.)

Not captured in the retrieved list but relevant to the family (do NOT attribute to '118 without verification): the sibling patent US 7,489,298's front page lists foreign references EP 0919906 A2 (1999), WO 96/11435 (1996), WO 03/48909 (2003) and WO 05/99166 (2005). These may or may not appear on '118's own front page — I could not confirm, so I am flagging them as unverified.

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3. Most relevant prior art and the § 102 analysis

The independent claims of '118 require, in substance: (i) a hand-held pointing device with two rotational sensors (first/second axes) plus an accelerometer; (ii) a processing unit that converts all three outputs from a body frame of reference into a user's/inertial frame of reference to remove tilt effects; and (iii) output of x/y cursor data whose movement is substantially independent of the orientation in which the device is held. There is also a method claim (detect movement; compensate by transforming body frame → inertial frame) and a broader "3D handheld device" claim (≥1 sensor + processing unit performing that transform).

Ranked by closeness to that concept:

(A) Most relevant — the tilt-compensation references

1. US 2004/0239626 A1 — Noguera, "Tilt-based pointing for hand-held devices" (pub. 2004-12-02).
This is the closest reference on the core concept (compensating pointing/sensing for how the device is held). It is published after the Apr. 30, 2004 priority date, so it is not § 102(a)/(b) art; it is prior art only if its own filing date precedes Apr. 30, 2004 (§ 102(e)) — I could not confirm its filing date from the retrieved data.

• Potentially anticipates: the broad method/device independent claims that recite the generic step of "compensating detected movement by transforming from a body frame into an inertial/us­er frame" — if Noguera discloses deriving a tilt angle and rotating sensed motion into the user frame. That generic language is the most vulnerable to § 102 here.
• Likely does NOT anticipate: the apparatus claim (claim 1), because Noguera's tilt-based pointing appears to rely on tilt sensing rather than the specific two-rotational-sensor + accelerometer combination recited. As § 102 art it is therefore stronger against the method/device independents than against claim 1.

2. US 5,440,326 (Quinn) — and its sibling US 5,898,421 (Quinn).
'118's own Background expressly cites '326 as the exemplary prior 3D pointing device, describing a gimballed vertical gyroscope whose shaft-angle encoders sense controller orientation for cursor control.

• Potentially anticipates: only the most generic "determining x and y coordinates associated with movement of a screen cursor" concept, and (mechanically) the notion of a fixed vertical reference that makes cursor motion independent of hand rotation — the gimbal is a mechanical analog of '118's software tilt compensation.
• Does NOT anticipate: the '118 apparatus claim, because Quinn uses a gyroscope + gimbals + optical encoders, not "first and second rotational sensors" + "accelerometer" with a processing unit performing the mathematical frame conversion. Expect this to be a § 103 (obviousness) reference, not a § 102 reference — which is consistent with the original prosecution use of it as background.

3. US 5,138,154 (Hotelling) — orientation-sensor computer input.
Recites a hand-held input using an orientation sensor to drive cursor control.

• Potentially anticipates: a broad claim reciting compensation of sensed orientation to produce cursor movement. It does not appear to disclose the two-gyro-plus-accelerometer conversion architecture, so again it is more § 103 than § 102 against claim 1.

(B) Secondary — 3D / free-space / accelerometer input devices (mostly § 102(b) background)

• US 6,115,028 (Balakrishnan et al.), "free-space" graphical input — closest of the background set to "3D pointing," but directed to position/gesture sensing, not rotational-sensor tilt compensation.
• US 6,492,981 (Stork et al.) — hand-held cursor control.
• US 5,825,350 (Case, Jr. et al.) — electronic pointing apparatus.
• US 5,698,784 (Hotelling et al.) and US 5,703,623 (Hall et al.) — motion/input devices.
• These are best characterized as § 102(b) background art establishing the general state of hand-held pointing; none appears to disclose the specific body-frame→user-frame transformation of gyro and accelerometer data that '118 claims. They support § 103 combinations rather than standalone § 102 anticipation.

(C) Not prior art at all (must be flagged)

The following cited items are the applicant's own co-pending applications / family publications and cannot be § 102(a)/(b) art, and are § 102(e)-disqualified by the shared priority:

• US 2005/0253806 A1 (Liberty et al.)
• US 2005/0243061 A1 (Liberty et al.)
• US 2005/0174324 A1 (Liberty et al.)
• US 2005/0243062 A1 — '118's own pre-grant publication (from the same 11/119,719 application)
• US 2004/0268393 A1 (Hunleth et al.) — the incorporated '432 control-framework application.

Treating these as prior art would be a double-counting error (impermissible under § 102(e)/§ 103(c) common-ownership principles for commonly owned, commonly invented subject matter).

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4. Bottom line on § 102 anticipation

• No single reference cited on the face of '118 appears to disclose the full combination of the independent apparatus claim (first + second rotational sensors and an accelerometer, with a processing unit that converts all three from the device body frame into a user's frame to yield orientation-independent x/y cursor data). On the retrieved record, claim 1 is not anticipated by any of these, though Quinn '326/'421 and Hotelling '154 make the concept broadly old.
• The generic independent method/device claims (the "detect movement → compensate by transforming body frame → inertial frame" language) are the most exposed to § 102, and US 2004/0239626 (Noguera) is the single most material reference for them — conditional on its filing date predating Apr. 30, 2004, which I could not verify.
• The bulk of the face-of-patent citations function as § 102(b) background for the "3D pointing" field and as § 103 building blocks, not as § 102 anticipants.

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5. Explicit uncertainties / what I could not verify

1. Truncated citation list — the retrieved "Referenced Cited" record stopped at US 2005/0253806; the Foreign Patent Documents and NPL sections of '118 were not retrieved. There may be foreign references (cf. the sibling '298's EP 0919906 A2 / WO 96/11435 / WO 03/48909) that I could not confirm for '118.
2. Titles marked ✱ are reconstructed from my own knowledge, not from the retrieved front page; verify each against the granted patent.
3. Noguera's filing date (the linchpin of its § 102(e) status) is unverified.
4. Original examiner rejections were not retrieved — I cannot state which of these references the examiner actually applied under § 102 vs. merely listed. The inter partes reexamination requested July 13, 2012 and any resulting reexamination certificate/claim amendments also were not retrieved and could change the claim scope analyzed here.
5. Claim-number mapping (which number is the method claim vs. the device claim) is my inference from the specification's three-embodiment Summary; the ITC record indicates claims 1–4 were asserted. Verbatim granted-claim text should be pulled from USPTO PatentCenter before any final § 102 chart is filed.

I'll research the prior art record for US 7,158,118 (the "Prior Art section" of its Google Patents page) and the reexamination/invalidity contentions that actually applied § 103 to these claims.

I have the claim structure and a partial prior-art list. Let me pull the full "References Cited" list, the full claim text, and the reexamination/invalidity prior art.

Obviousness Analysis — U.S. Patent No. 7,158,118 B2 under 35 U.S.C. § 103

Analyst note on sourcing: My research was cut short by tool limits partway through gathering the full prior-art record. Everything below distinguishes (i) verified facts (the patent text you supplied, the front-page "References Cited" list I retrieved from the granted-PDF snippet, and third-party statements I retrieved), from (ii) recollected reference disclosures that I was not able to verify full-text. I flag each. Per the operating rules, I have not auto-corrected any identifiers.

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0. Threshold corrections and flags

Governing law/date. Application 11/119,719 filed May 2, 2005; earliest priority April 30, 2004 (prov. 60/566,444). Because filed pre-AIA, § 103(a) applies with pre-AIA § 102(a)/(b)/(e)/(g) as the qualifying gates — i.e., patents/printed publications before Apr. 30, 2004 (or Apr. 30, 2003 for § 102(b)), and U.S. patents/publications under § 102(e) as of their filing dates. The patent is expired (anticipated May 2, 2025), so any § 103 fight is now backward-looking (past damages), and the ITC matter settled before any ALJ initial determination (terminated Sept. 28, 2009) — there is no adjudicated validity holding and no estoppel.

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1. The claims to be analyzed (element decomposition)

Claim 1 (method):

1. detecting movement of the 3D pointing device;
2. compensating by transforming from a body frame of reference into an inertial frame of reference by determining a tilt associated with the orientation in which the device is held;
3. compensating to correct for said tilt;
4. wherein (3) comprises rotating first and second rotational outputs into the inertial frame by calculating [a trigonometric rotation matrix].

Claim 9 (handheld pointing device):

1. first rotational sensor (rotation about a first axis) → first rotational output;
2. second rotational sensor (rotation about a second axis) → second rotational output;
3. accelerometer → acceleration output;
4. processing unit that (a) converts all three outputs from a body frame into a user's frame of reference to remove tilt effects of how the device is held, and (b) determines x/y data associated with screen-cursor movement from the converted outputs;
5. wherein the conversion renders cursor movement substantially independent of the orientation in which the user holds the device.

Claim 12 (3D pointing device): at least one movement sensor + processing unit performing the same body→inertial transform by determining tilt, and rotating first and second rotational outputs into the inertial frame by calculation.

The entire inventive contribution reduces to two propositions: (A) use an accelerometer's gravity vector to compute the device's tilt, and (B) apply a 2×2 rotation to the two rotational-sensor channels so the cursor responds to the user's frame rather than the device's frame. Note that the specification itself characterizes this as a subset: "Tilt compensation as described in this exemplary embodiment is a subset of a more general technique for translating sensor readings from the body frame of reference into a user's frame of reference…" — an admission that frame-transformation was itself a known, general technique.

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2. The prior-art record ("Prior Art section")

2.1 References Cited on the face of the '118 (retrieved in part; OCR-garbled, verify against the printed patent)

Also cited: foreign documents (DE, GB, JP, WO) and non-paper art (e.g., a face-recognition paper relevant to the tremor/user-ID sibling, not this patent).

2.2 Admitted prior art in the '118 itself (fully verified — these are the strongest anchors)

• U.S. 5,440,326 (Quinn): a vertical-gyroscope pointing device, whose spin axis is kept vertical by a pendulous device and whose shaft-angle encoder output is converted to cursor control. I.e., the prior art already recognized that the sensing frame must be referenced to gravity, not the device body, and solved it mechanically.
• The Background admits that performing the motion→cursor mapping in the body frame was a known technique, and that its drawback ("if the user holds the device on its side and moves the device left to right, the cursor will move vertically, not horizontally") was known.
• The specification admits the accelerometer's use for error compensation of the rotational sensors and for deriving attitude (e.g., computing ω_Y from d/dt·tan⁻¹(x/z)), i.e., attitude-from-accelerometer was routine.

2.3 Third-party characterizations (verified text, non-prior-art — usable for claim construction and for "state of the art" evidence)

• Movea/CEA, WO 2009/156499 A1 (published 2009 — post-dates the '118 and is NOT prior art): describes "the solutions proposed in the prior art to effect this change of reference frame, notably those disclosed by US7158118 which employs MEMS micro-accelerometers and micro-gyrometers… characterized by… compensation for the angle of roll of the device with respect to the carrier… generally performed by virtue of the accelerometric measurements" and notes pitch is not compensated.
• CyWee/Google IPR petitions (US 7,158,118 cited as "Liberty"): describe "Liberty is directed to a 3D pointing device with orientation compensation that utilizes a five-axis sensor module of two rotation sensors… and a three-axis accelerometer… Liberty's five-axis sensor module allowed for detection of roll about the X-axis." Third parties also argued Liberty was a "patentable improvement over Zhang."
• LG, in prosecuting US App. 13/367,058, characterized Liberty as "directed to transforming sensed motion data of a 3D pointing device from a first frame of reference (body of the 3D pointing device) into a second frame of reference (user's frame of reference) in order to compensate for a tilt of the entire 3D pointing device held by a user."

Caveat: 2.3 items are admissible only as evidence of what a POSITA understood and for claim construction — they are not § 102/§ 103 prior art to the '118.

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3. Ground 1 (primary): Quinn '326 in view of accelerometer-based tilt determination

Theory. Quinn '326 teaches everything except the electronic implementation of the gravity reference:

Secondary reference(s): the cited attitude/inertial-measurement art — US 5,181,181 (Glynn, class 702/141) and/or US 6,466,831 / 6,164,808 (Shibata et al., Sony) — for the proposition that a device's tilt/attitude can be computed from accelerometer (gravity) measurements and used to correct sensor outputs. (I did not verify these references' full text; Shibata in particular should be confirmed — my recollection is that the Sony family discloses a free-space input device with angular-velocity sensors and gravity-based attitude correction, but treat that as unverified.)

Motivation to combine (articulated, KSR/In re Kahn):

1. Same field of endeavor, same problem: hand-held free-space pointing for on-screen cursor control (both cited on the '118's face; '326 is admitted prior art).
2. Substitution of a known electronic technique for a known mechanical expedient — MPEP 2141(B)/(C)/(D). Quinn's pendulous vertical reference is the gravity-frame requirement; computing the same angle from an accelerometer is a predictable, known equivalent, with the recognized benefits of eliminating moving parts (cost, size, drift, shock tolerance) — exactly the design pressures the '118 itself identifies ("employ components… which are not too costly").
3. No added hardware. The '118 admits the accelerometer is already in the device to compensate rotational sensors for linear acceleration. A POSITA seeking to improve a known device and already having the gravity vector available would use it — MPEP 2141(D).
4. Predictable result: cursor response independent of how the user rolls the device in the hand ("rotating the device left-to-right should move the cursor left-to-right").

Assessment: This is the strongest ground for claims 1 and 12 (method/device reciting "inertial frame"). Claim 9's "user's frame of reference" limitation may require the additional mapping/interface art (Ground 2/3) or the argument that a gravity-referenced frame and a user's viewing frame coincide in the claimed 10-foot use.

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4. Ground 2: Shibata (US 6,466,831 / 6,164,808) in view of Quinn ('421/'326)

Theory. Sony's free-space input device (two-axis angular-velocity sensing, gravity-based attitude) as primary, combined with the Quinn free-space pointer art for the device architecture and cursor-mapping.

Motivation: Both teach hand-held spatial input devolving to a 2D screen cursor; the combination is a simple substitution of known elements to obtain predictable results (MPEP 2141(A)/(B)); moreover, a POSITA would be drawn to Shibata because it already addresses the exact deficiency that Quinn's mechanical pendulum reference was designed to solve. Verification required: I was unable to confirm the specific tilt/attitude teachings of the Shibata references; do not brief this ground without pulling the documents.

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5. Ground 3: Zhang (US 2004/0095317 A1) in view of an attitude-determination and user-frame-mapping reference

Theory. Zhang — cited on the '118's face and characterized by third parties as "a method and apparatus of universal remote pointing control for a home entertainment system and computer" — supplies the 3D pointing/remote architecture and cursor control. The secondary reference (Quinn '326/'421, Hotelling '154/'784, Case '350, Schein '394, or Shibata) supplies the tilt/gravity reference and the frame transformation.

Motivation: Zhang's subject matter (universal remote pointing control for home entertainment) is the same field and the same consumer problem as the '118's stated motivation (10-foot television UI); the improvement — referencing the sensors to gravity so the remote works regardless of grip — is a known technique applied to a known device ready for improvement (MPEP 2141(C)/(D)).

Two important cautions:

• Zhang is § 102(e)-only. Its May 2004 publication date is after the Apr. 30, 2004 priority date; it can only be prior art through its U.S. filing date. Confirm that date.
• Third parties (CyWee) have asserted that the USPTO considered Liberty a "patentable improvement over Zhang" for adding a sensor axis. That is an adversary's characterization in a different case and does not bind, but it signals the examiner did not find Zhang alone (or a simple Zhang combination) sufficient. A Zhang-based ground must therefore be a multi-reference ground, not Zhang alone.

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6. Ground 4 (broadest): the "frame transformation is a known mathematical technique" combination

Combine (i) any cited free-space pointing reference (Quinn, Shibata, Case, Zhang) with (ii) the admitted state of the art that orientation/tilt may be determined from accelerometers (the '118's own Background and its cited attitude art), and (iii) the specification's own admission that tilt compensation is "a subset of a more general technique for translating sensor readings from the body frame of reference into a user's frame of reference" (Euler angles, direction cosine matrices, quaternions).

This ground attacks the breadth of claims 1 and 12, which recite the transform generically plus a trigonometric rotation matrix. Note the specific matrix recited (cos θ, sin θ terms from θ = atan2(y,z)) is a textbook elementary rotation about the roll axis — under KSR, "a court can take account of the inferences and creative steps that a person of ordinary skill in the art would employ."

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7. Consolidated motivation-to-combine showing

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8. Dependent claims (2–8; 10–11; 13–17)

I could not retrieve verbatim text for these claims. Based on the specification (which is fully available and which I treat as authoritative for what these claims most likely cover), the likely subject matter is: MEMS/Coriolis rotational sensor selection (ADXRS150/ADXRS401), sampling rate (≈200 Hz), accelerometer calibration (scale/offset/cross-axis; Eqs. 1–3), temperature-dependent offset compensation and dynamic offset (offset(T), dOffset), stationary detection and its state machine (ACTIVE/INACTIVE/STABLE/STATIONARY/SLEEP/WAKEUP), tremor removal via hysteresis, and low-pass filtering of the accelerometer before atan2. Each of these is a well-trodden, conventional implementation detail (calibration, filtering, state machines, hysteresis) and would be obvious alone or in combination with the primary grounds — but do not assert this without pulling the actual dependent-claim text.

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9. Non-obviousness / rebuttal considerations (what Patent Owner/DRNC would argue)

1. No adjudicated validity: the 2008 dispute settled; the ITC terminated on Sept. 28, 2009 without an initial determination on the merits, and the district case was dismissed with prejudice Oct. 16, 2009. There is no estoppel or precedent to cite either way.
2. Mechanical vs. computational distinction: Patent Owner can argue that KSR substitution is improper because Quinn's pendulous gyroscope keeps the spin axis referenced to gravity, whereas the claims require computing tilt from a linear accelerometer and rotating the two gyro channels; the references do not disclose or suggest that specific algorithmic step.
3. Adversarial admissions of non-obviousness over Zhang: LG/Samsung/CyWee relied on Liberty being "a patentable improvement over Zhang." But those are admissions made to support someone else's patent, in different proceedings — of limited evidentiary weight.
4. Secondary considerations: Hillcrest's 29-patent portfolio and undisclosed licenses (per its Aug. 20, 2008 press release) suggest commercial success, but the confidential settlement destroys the nexus evidence.
5. § 103(c) / § 102(e) traps: several cited publications (US 2005/0174324 to Liberty; the Hillcrest sibling applications) are commonly owned and therefore likely disqualified under pre-AIA § 103(c) — a petitioner must not build a ground on them.

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10. Confidence and verification plan

Bottom line: On the record of art cited on the face of the '118 — principally Quinn (US 5,440,326 / 5,898,421) combined with the accelerometer-based attitude-determination art (Shibata US 6,466,831 / 6,164,808; Glynn US 5,181,181), and secondarily with Zhang (US 2004/0095317 A1) — the independent claims' core contribution (compute tilt from an accelerometer, then rotate the two rotational-sensor outputs into a gravity/user frame so cursor motion is grip-independent) is substantially placed in obviousness territory, especially post-KSR, given the patent's own admissions of the body-frame mapping problem, of the general frame-transformation technique, and of the accelerometer's presence in the device for other purposes. The strongest defenses for Patent Owner are (a) the specific algorithmic recitations in claims 1/12, (b) claim 9's explicit "user's frame" + "cursor movement substantially independent of orientation" language, and (c) the fact that no tribunal has ever passed on the merits. I cannot close the file on any ground without the full-text verification steps listed above.