US 7525535

I'll verify the USPTO and CAFC record for this specific patent number before summarizing.

Summary — US 7,525,535 B2

1. Bibliographic identification (as it appears literally in the record)

Note on the "current assignee" field. Google Patents lists two names — "VIDEOLABS Inc" and "HPS Investment Partners LLC." Only VideoLabs is an owner. HPS Investment Partners is a released collateral agent (lien released 2016-07-11, reel 039359/0916); its appearance in the assignee field is a stale artifact, not a present ownership interest. This is consistent with the Assignment History section already generated.

2. Abstract (as it appears in the record, verbatim)

"A portable terminal has a body including a transparent window integrally formed therein, a display disposed beneath the body and visible through the transparent window, and a touch screen located between the display and the body, the touch screen permitting signal input in a capacitive manner."

3. Plain-language overview of the independent claims

Important terminology note before reading: the specification (and the abstract) describe a "body" with an upper body 10 and lower body 12, and refer to a "transparent touch pad 20"; the claims instead recite a "housing" and a "touch pad." The abstract's closing reference to a "touch screen" where the claims say "touch pad" is an internal inconsistency in the document itself. I flag it rather than reconcile it.

Claim 1 — the "full architecture" independent claim

A handheld terminal built around a sealed, one-piece front, comprising:

1. Housing with an integrally formed transparent window. The housing also carries an opaque film on its lower surface, and that film has an open portion — the opening in the film is what defines the window. (This is the "no aperture through the case" idea: the window is a clear region of the molded part, not a hole with a separate lens dropped into it.)
2. Display mounted at the housing, showing information through the transparent window.
3. Capacitive touch pad located between the housing and the display — i.e., under the window, not exposed. It is connected at one end to either the display or the main circuitry supporting substrate (the mainboard) via a flexible printed circuit (FPC).
4. Within the touch pad, two named sub-parts:
   • a touch-sensing unit on (at) the inner surface of the transparent window, touched by the user's body through the window; and
   • a signal-transferring unit at the edge of the sensing unit, which carries a signal corresponding to the coordinate value read by the sensing unit.
5. A control circuit mounted on the FPC that converts the signal from the signal-transferring unit into a coordinate value and sends that coordinate value to a controller of the main circuitry supporting substrate.

In short: clear integral window + black-out film with a window-shaped cut-out + capacitive sensor sandwiched between window and screen + a chip-on-flex that does the coordinate math and hands it to the phone's main processor.

Claim 5 — the "broad" independent claim

Claim 5 covers the same device at a higher level of generality. It requires:

• the same housing with an integrally formed transparent window defined by an opaque film on the lower surface with an open portion;
• the same display visible through the window;
• the same capacitive touch pad between housing and display, connected at one end to the display and/or the main circuitry supporting substrate via an FPC; and
• the same FPC-mounted control circuit converting "a signal generated by the touch pad" into a coordinate value for the main-substrate controller.

The difference that matters: claim 5 omits claim 1's requirement that the touch pad be divided into a touch-sensing unit plus a signal-transferring unit, and it recites the conversion input more broadly ("a signal generated by the touch pad"). That makes claim 5 the broader and harder-to-avoid claim — and it is precisely claim 5 that VideoLabs has asserted (see §5).

Dependent claims (for completeness)

• Claim 2 — the housing is formed by double injection molding.
• Claim 3 — the signal-transferring unit is transparent (so it doesn't veil the display).
• Claim 4 — a gap-maintaining pad is interposed between the edge of the touch pad and the edge of the display to hold a gap between them.

4. USPTO database check — what the record shows

• USPTO record verified at https://uspto.report/patent/grant/[7525535](/patent/7525535) and the Google Patents full-text record (https://patents.google.com/patent/US7525535/en). Bibliographic data above matches both.
• Prosecution record: eight references cited (four examiner-cited, four applicant-cited); five claims allowed as filed-in-substance; no reissue, no reexamination, no certificate of correction surfaced.
• AIA trial proceedings naming 7,525,535: none found. This is consistent with the PTAB Challenges section already generated, which concluded zero IPRs/PGRs/CBMs against this patent.
• Family members: KR 100778483 B1; EP 1884870 B1 (incl. AT E479141 T1 and DE 602007008649 D1); CN 101115256 B; CA 2586836 C; RU 2435301 C2; TW I425804 B; BR PI0702596 A; MX 2007005715 A; DE 10 2007 021 058 A1; DE 20 2007 018 285 U1.

5. CAFC 2026 dockets — negative finding

I found no Federal Circuit docket in 2026 that names U.S. Patent 7,525,535.

• The VideoLabs-related Federal Circuit activity in the 2025–2026 term concerns different patents. VideoLabs, Inc. v. Netflix, Inc., Nos. 2025-1131 / 25-1132 (Fed. Cir.), is an appeal from IPR2023-00630 on U.S. Patent No. 7,440,559 — the nonprecedential affirmance (2026-08-10) holds claims 1–24 of the '559 patent unpatentable and says nothing about the '535 patent. Oral-argument audio for 2025-1131 was posted on the CAFC site on 2026-05-07.
• The district-court matters that do name the '535 patent (VideoLabs v. Apple; VideoLabs v. ASUSTeK; VideoLabs, Inc. v. TCL Technology Group Corporation et al., E.D. Tex. 2:25-cv-00161) are terminated at the district level: the TCL case was dismissed with prejudice by Order No. 27 (E.D. Tex. Nov. 14, 2025), docket marked CLOSED, with no appeal naming this patent surfaced. Docket Alarm confirms the asserted-patent list in 2:25-cv-00161 as 7525535; 7769238; 7970059; 8139878; 8220027; 8291236; 8667304.
• Assertion pattern confirmed: in the TCL complaint, the '535 patent is asserted at at least independent claim 5 (Compl. ¶183), with the accused feature being "the physical construction of TCL's touchscreen tablets and phones" (e.g., TCL TAB 10s) — see https://ai-lab.exparte.com/case/dct/txed/2:25-cv-00161/doc/analysis/1. The Apple complaint similarly charted "a flexible printed circuit (FPC) with a control circuit mounted thereon" and an "outer glass that includes an integrally formed transparent window" — i.e., the claim-1/claim-5 FPC-control-circuit and integral-window elements.
• Stanford NPE Litigation Database (https://npe.law.stanford.edu/patent/7525535) lists VideoLabs Inc. et al v. Apple Inc., 3:23-cv-01307 (N.D. Cal.) as an involving case — consistent with the venue discrepancy flagged in the Litigation Summary (the same case is also reported under 4:23-cv-01307 N.D. Cal. and 3:23-cv-01307 E.D. Cal.). I could not resolve that split, and I am not guessing.

6. Number-collision warning (do not auto-correct)

A literal search for the digit string 7525535 returns an unrelated Japanese patent — JP 7525535 B2 (issued 2024-07-30), which appears in EPO records concerning optical waveguide circuits. That is a different patent document in a different country and has no relationship to US 7,525,535. Similarly, the numerals 7,440,559, 7,970,059, 8,291,236, 8,605,794, 7,233,790, and 7,266,682 are sibling VideoLabs portfolio patents litigated/PTAB-challenged in the same campaign — they are not this patent and must not be substituted for it.

7. Uncertainty and internal contradictions I am flagging rather than papering over

1. Date inconsistency in the source materials. The stated "current date" for this task is 2026-04-26, yet the patent text block is marked "Fetched: 2026-09-03," and the previously generated Litigation and Strategic sections rely on events dated after April 2026 (e.g., the 2026-08-10 CAFC affirmance in No. 25-1132; the 2026-05-07 CAFC oral-argument posting; 2026-03/05/06/07 PTAB developments surfaced in searches). I am reporting the events as the records state them, but the chronology does not close, and a reader should treat any "as-of" framing with that caveat.
2. Venue for the Apple action is unreconciled across sources (N.D. Cal. vs. E.D. Cal.; case nos. 3:23-cv-01307 vs. 4:23-cv-01307).
3. Whether the '535 patent was among the patents asserted in VideoLabs v. Roku (D. Del. 1:23-cv-01136) could not be verified. Roku's stay motion references IPRs on "five of the seven asserted patents," but does not identify the seven. Do not assume the '535 patent was or was not one of them.
4. Title vs. text mismatch: the title is "Portable terminal"; the abstract calls the input element a "touch screen" while every claim says "touch pad," and the claims say "housing" while the specification says "body." These are the document's own inconsistencies, reproduced literally.
5. No authoritative statement was located confirming that any specific shipped LG handset embodied all claim limitations; the infringement theory in the Apple and TCL complaints is VideoLabs' allegation, not an adjudicated finding (both cases ended without claim construction or a validity/liability determination).

Key sources: https://patents.google.com/patent/US7525535/en; https://uspto.report/patent/grant/7525535; https://npe.law.stanford.edu/patent/7525535; https://www.docketalarm.com/search/?q=patent%3A%288291236%29 (2:25-cv-00161, asserted-patent list and Order No. 27 dismissal); https://ai-lab.exparte.com/case/dct/txed/2:25-cv-00161/doc/analysis/1 (complaint analysis, claim 5 asserted); https://cases.justia.com/federal/appellate-courts/cafc/25-1132/25-1132-2026-08-10.pdf (CAFC opinion on the different '559 patent); https://www.cafc.uscourts.gov/2026/05/07/ (CAFC 2026 docket page, 2025-1131 VideoLabs v. Netflix).

Based on my searches of the available docket and litigation databases, here is the known litigation involving US 7,525,553 (US7525535B2, "Portable terminal"). I have limited the list to matters that specifically name this patent number, and I flag venue/status points where sources conflict.

District-court litigations asserting US 7,525,553

1. VideoLabs, Inc. and VL Collective IP LLC v. [Apple Inc.](/litigations/by-plaintiff/Apple%20Inc.)

• Plaintiffs: VideoLabs, Inc.; VL Collective IP LLC
• Defendant: Apple Inc.
• Case No.: 3:23-cv-01307 (some records additionally flag No. 4:23-cv-01307; see venue note below)
• Jurisdiction: Reported inconsistently — PatSnap's PACER-based summary says California Eastern District Court (Judge Araceli Martinez-Olguin), while the Stanford NPE Litigation Database and the case-number prefix convention ("3:") point to the Northern District of California. Google Patents/Unified Patents flags list both a California Northern case (4:23-cv-01307) and a California Eastern case (3:23-cv-01307). I cannot fully reconcile this discrepancy.
• Filing date: 2023-03-21 (per PatSnap)
• Patents asserted: US 7,525,553 and US 8,605,794
• Status/Outcome: Dismissed with prejudice pursuant to a stipulated agreement (~199 days after filing, i.e., ~October 2023), each party bearing its own fees/costs. No liability finding, claim construction, or validity determination was made. VideoLabs' claims against Apple are extinguished, but the patent was reported to remain active and enforceable against third parties.

2. VideoLabs, Inc. v. ASUSTeK Computer Inc. et al.

• Plaintiff: VideoLabs, Inc.
• Defendants: ASUSTeK Computer Inc. et al.
• Case No.: 6:22-cv-00720
• Jurisdiction: Texas Western District Court (Waco Division; Judge Alan D. Albright)
• Filing date: 2022-06-30
• Patents asserted: 7,525,553 among a multi-patent portfolio (the patent was identified as an asserted patent in this matter in VideoLabs' related-matter disclosure in IPR2024-01025)
• Status/Outcome: Terminated/closed 2025-07-30; the docket includes STAYED and CLOSED flags. (The related IPR mandatory-notice filed July 3, 2024, still described this case as pending.)

3. VideoLabs, Inc. v. ASUSTeK Computer Inc.

• Plaintiff: VideoLabs, Inc.
• Defendant: ASUSTeK Computer Inc.
• Case No.: 6:23-cv-00640
• Jurisdiction: Texas Western District Court
• Filing date: 2023-08-31
• Patents asserted: 7,525,553 (independent claim 5 asserted) together with 7,970,059, 8,220,027, and 8,291,236, per the complaint analysis
• Status/Outcome: Voluntarily dismissed (so stated in VideoLabs' mandatory-notice filing in IPR2024-01025, dated July 3, 2024); case docketed as closed.

4. VideoLabs, Inc. v. TCL Technology Group Corporation et al.

• Plaintiff: VideoLabs, Inc.
• Defendants: TCL Technology Group Corporation; TCL Electronics Holdings, Ltd. (f/k/a TCL Multimedia Technology Holdings, Ltd.); TCL Industries Holdings Co., Ltd.; TCL King Electrical Appliances (Huizhou) Co., Ltd.; T.C.L. Industries Holdings (H.K.) Ltd.; TTE Corporation; TCL Moka International Ltd.; TCL Moka Manufacturing S.A. de C.V.; Manufacturas Avanzadas S.A. de C.V.; TCL Smart Device (Vietnam) Co., Ltd.; Shenzhen TCL New Technology Co., Ltd.; TCL Optoelectronics Technology (Huizhou) Co., Ltd.; TCL Overseas Marketing Ltd.
• Case No.: 2:25-cv-00161
• Jurisdiction: Texas Eastern District Court (Marshall Division; Judge Rodney Gilstrap; Magistrate Judge Roy S. Payne)
• Filing date: 2025-02-10
• Patents asserted: 7,525,553 (at least independent claim 5, per the complaint, ¶183) among seven patents: 7525535; 7769238; 7970059; 8139878; 8220027; 8291236; 8667304
• Status/Outcome: Dismissed with prejudice by Order No. 27 dated 2025-11-14 (docket marked CLOSED). The accused products were TCL touchscreen tablets and phones (e.g., TCL TAB 10s).

Other proceedings / caveats

• No CAFC appeal specifically naming 7,525,553 was found in my searches (consistent with the prior patent summary). The 2026 Federal Circuit decision in the VideoLabs/Netflix matter concerned U.S. Patent No. 7,440,559 — a different patent.
• The Google Patents record for the patent family also flags Texas Western, California Northern, and California Eastern cases and a darts-ip "first worldwide family litigation" entry; the Texas Western and California entries correspond to the ASUSTeK and Apple matters above. The California Northern flag (4:23-cv-01307) may be a separate Apple action or a duplicate/miscataloged entry — I could not verify it independently before the search limit was reached.
• PTAB proceedings referencing the litigation (e.g., IPR2024-01025, Roku, Inc. v. VideoLabs, Inc.) exist but are inter partes reviews of related portfolio patents, not direct infringement litigation on 7,525,553, and I did not confirm that 7,525,553 itself is the IPR target.

Key sources: Docket Alarm (2:25-cv-00161 docket, including dismissal Order No. 27); Ex Parte complaint analysis for 2:25-cv-00161 and 6:23-cv-00640; PatSnap litigation summary of VideoLabs v. Apple (3:23-cv-01307); Stanford NPE Litigation Database (npe.law.stanford.edu/patent/7525535); RPX Insight (6:23-cv-00640); VideoLabs mandatory notice in IPR2024-01025 (DocketAlarm PDF, 2024-07-03); Google Patents litigation flags (https://patents.google.com/patent/[US7525535](/patent/US7525535)/en).

I'll research whether any AIA trial proceedings exist for this patent. The canonical ODP data reports none, but let me search to verify and flag anything newer.

The initial results show IPRs against other VideoLabs patents (7,440,559, 8,291,236, 7,970,059) but none against 7,525,535. Let me run additional targeted checks to be thorough.

Proceedings overview

Total AIA trial proceedings on file: zero (0). There are no inter partes reviews, post-grant reviews, or covered business method reviews — active, instituted, denied, settled, or decided — against US 7,525,535. The USPTO Open Data Portal ingest returns no proceedings, and independent web searching for "7525535" / "7,525,535" combined with IPR/PGR/PTAB terms surfaces only proceedings on other VideoLabs-family patents (e.g., 7,440,559, 8,291,236, 7,970,059, 8,605,794, 7,233,790), none naming this patent. The defensive posture for a defendant: all five claims (1–5) are untested before the PTAB — no claim has been canceled or sustained in an AIA trial, so validity is virgin territory that an accused infringer can still shape with a well-built § 102/§ 103 petition. The absence of any IPR despite years of assertion by VideoLabs is itself a strategic data point (see Strategic summary).

No per-proceeding sections follow, because there are no proceedings to report. I am not inventing any. What follows is the cross-checked negative and what it means.

Strategic summary

Claims status: all CANCELED vs. SUSTAINED vs. UNTESTED — every claim is UNTESTED. Claims 1 (independent apparatus claim: integrally formed transparent window + opaque film open portion + capacitive touch pad with touch-sensing unit and signal-transferring unit + FPC-mounted control circuit converting the signal into a coordinate value for the controller) and 5 (independent apparatus claim: same window/housing/display/touch-pad structure with the FPC-mounted control circuit, stated more broadly as converting "a signal generated by the touch pad"), plus dependent claims 2 (double injection molding), 3 (transparent signal-transferring unit), and 4 (gap-maintaining pad), remain fully in force. No PTAB panel has ever construed these claims in an AIA trial, no prior art has been tested against them at the Board, and no estoppel under § 315(e)(2) binds anyone from challenging them. There has also been no reexamination surfaced on this patent, so the record contains no agency merits holding at all.

Estoppel landscape — wide open. Because no petitioner has ever filed an IPR on 7,525,535, § 315(e)(2) estoppel has not attached against anyone with respect to this patent. Any ground that was raised, or reasonably could have been raised, in a prior AIA petition is unavailable to a prior petitioner and its privies — but here there is no prior petitioner. For a defendant currently being asserted against (VideoLabs has asserted this patent in, e.g., VideoLabs, Inc. v. TCL Technology Group Corp. et al., E.D. Tex. 2:25-cv-00161, which was dismissed with prejudice in 2025), every § 102/§ 103 ground based on patents and printed publications predating the 2006-07-27 priority date is still available. Note the obviousness/knowledge window: this is a 2006 Korean-origin touch-screen/portable-terminal patent, so pre-2006 capacitive-touch and handset-integration art (e.g., the references the examiner already cited — US 2006/0097991 A1 "Multipoint touchscreen," US 2005/0280635, EP 1,758,345, US 2003/0040287 — plus any art not of record, which is where a petitioner should look hardest) is in play.

Pattern signals. No single petitioner has filed multiple IPRs on this patent because none has filed any. The broader pattern, however, is instructive: VideoLabs patents are being aggressively attacked at the PTAB and are losing. Netflix's counsel (Willkie) invalidated all claims of three VideoLabs patents (7,233,790, 7,440,559, 8,605,794), and the CAFC affirmed the 7,440,559 invalidation in August 2026 (VL Collective IP, LLC v. Netflix, Inc., No. 25-1132, Fed. Cir. 2026-08-10, nonprecedential). Roku, Dell, and Hisense have also filed or pursued IPRs on VideoLabs patents (e.g., IPR2025-00071 on the '559 patent; IPR2022-00701 on 7,970,059, denied; IPR2025-00882 on 8,291,236, discretionary denial). Defensive-aggregator involvement is visible on the VideoLabs litigation side — Unified Patents data tracks the VideoLabs district-court cases — but Unified Patents has not filed an IPR on 7,525,535. Why this patent has escaped challenge is a fair question: it may be that asserted defendants settled early (the TCL case closed with prejudice in 2025), or that licensees/defendants judged the touch-pad-handset claims less central than VideoLabs' content-delivery portfolio. Whatever the reason, the patent is not "hardened" by PTAB survival — it is simply uncontested at the Board, which is a materially different (and more defendant-favorable) posture than a patent that has beaten IPRs.

Recommended next steps

• There is no FWD to cite and no canceled claim to lean on. Do not represent to a court or in a negotiation that 7,525,535 has been weakened by the PTAB — it has not. Claims 1–5 are presump-tively valid and untested. The VideoLabs PTAB losses that are on the public record all concern different patents (7,440,559, 8,605,794, 7,233,790); citing them for this patent would be sanctionable overreach.
• If you are a defendant facing assertion today, the strategic window is a de novo IPR. File within one year of service of the complaint (35 U.S.C. § 315(b)). Build the petition around art not already of record in the file history — the examiner already considered the references listed in the patent's citation list, so § 325(d) discretion will favor you if your primary references are new. The claim set is small (two independents, three dependents), and claim 1's specific architecture (opaque film with an open portion defining the window; touch-sensing unit + signal-transferring unit pair; FPC-mounted control circuit doing the coordinate conversion) gives discrete § 103 attack surfaces.
• No active proceeding means no statutory deadlines to track — there is no institution-decision deadline, no oral-hearing date, and no FWD due date for this patent. The only date on the horizon is the patent's anticipated expiration on 2027-07-26 (maintenance fees paid through the 12th year; status active). An IPR filed now would need to be instituted and reach FWD well inside that window — the Board's 1-year trial clock runs from institution, so a petition filed in the next several months is still capable of producing a merits decision before expiry.
• Verify before you file. The ODP-derived "no proceedings" record is canonical as of its most recent ingest, and my searches corroborated it, but PTAB dockets update continuously. Re-check the USPTO PTAB End-to-End system (search by patent number 7,525,535) immediately before any filing deadline to confirm no petition has landed in the intervening period.

Sources: USPTO Open Data Portal proceeding data (in-prompt block); https://uspto.report/patent/grant/7525535; https://patents.google.com/patent/US7525535/en; https://www.docketalarm.com/search/?q=patent%3A%288291236%29 (VideoLabs v. TCL, E.D. Tex. 2:25-cv-00161, listing 7525535 among asserted patents; case closed 2025-11-14); https://law.justia.com/cases/federal/appellate-courts/cafc/25-1132/25-1132-2026-08-10.html (CAFC affirmance of IPR2023-00630 on the different '559 patent); https://portal.unifiedpatents.com/ptab/case/IPR2022-00701 (Dell IPR on the different '059 patent); https://ipverse.greyb.com/ptab-web/cases/case-details/IPR2025-00882 (Hisense IPR on the different '236 patent).

I'll research the assignment record details, particularly correspondents of record, which aren't in the Google Patents legal-events extract.

Good data. Let me try to pull the correspondent-of-record fields for the key reel/frame entries.

Assignment Record Reconstruction — US 7,525,535 B2 ("Portable terminal")

Data-source note (read first): The reel/frame, conveyance, assignor/assignee and execution/recording dates below come from the USPTO assignment data as mirrored in the patent's Google Patents legal-events record (which is the same underlying Assignment Center dataset; source URL: https://patents.google.com/patent/US7525535/en). The correspondent-of-record field is not exposed in that mirror, and my attempts to retrieve the underlying Assignment Center abstract pages for reels 022260/0484, 031866/0697, 032167/0406, 032326/0618, 032786/0546, 033281/0216, 039359/0916, 054380/0250 and 054723/0271 returned no correspondent text. I therefore report correspondent as not retrieved, not as absent. Everything else below is grounded in the cited reel/frame entries.

Inventors

Pattern observations:

• Both inventors are Korean-based LG engineers; the assignment is a standard employee-inventor → corporate assignee conveyance (not an invention-purchase), consistent with the Korean-priority filing (KR 10-2006-0071043, filed 2006-07-27; granted as KR 100778483 B1 on 2007-11-21).
• Execution date 2007-04-23, i.e. ~9 months after the Korean priority filing and ~3 months before the US filing (2007-07-26). This is a confirmatory/employment assignment executed during the priority-year window, not a last-minute pre-suit transfer.
• Recording lag: ~22 months (executed 2007-04-23, recorded 2009-02-12) — recorded roughly ten weeks before the 2009-04-28 grant. Long recording lags are common where the assignment is filed at issue; this is not a distress signal.
• No evidence of inventor departure within 12 months of filing is available in the assignment record, public filings, or the searches I ran. I cannot confirm or refute the "inventors leave before the fire-sale" pattern here — not determinable from this record.

Original assignee

LG Electronics Inc. (Seoul, KR — assignee of record per reel 022260/0484; listed as "Original Assignee" on the face of the patent).

• Primary line of business: Consumer electronics and mobile communications — LG was, at filing (2006–07), one of the world's largest handset manufacturers (LG Mobile Communications).
• Did they ship a product embodying the claims? Very likely yes, but not established by this record. US 7,525,535 claims a portable terminal with an integrally molded transparent window and a capacitive touch pad mounted beneath it — exactly the front-assembly architecture LG commercialized in 2007–08 capacitive-touch handsets. Notably, the examiner cited LG's own EP 1 758 345 A1, "Mobile telecommunication handset having touch pad" (priority 2005-08-26; the '535's own assignee), which is contemporaneous same-company art about a capacitive touch pad in a handset. I have not independently verified a specific LG model as an embodiment of claims 1–5 and flag that as unverified.
• Current status (as to this patent): LG is an operating, publicly traded company and is not the current owner. It divested this patent (and, on the same effective date, a large block of other assets) to Optis Cellular Technology, LLC. Whether LG retains any license-back or revenue interest is not determinable from the assignment record.

Assignment timeline

Nine recorded events. Chronological by execution/effective date (recording date given separately, since several were recorded long after they took effect).

2007-04-23 (executed) / recorded 2009-02-12 — Reel 022260/0484

• Conveyance: Assignment of inventors' interest
• Assignor: Kim, Jong-Hun; Park, Min-Ho
• Assignee: LG Electronics Inc. (Korea, Republic of)
• Correspondent: Not retrieved (field not exposed in the mirror I reached)
• Context: Routine employee-inventor assignment to the original corporate assignee.

2013-12-19 (effective) / recorded 2013-12-20 — Reel 031866/0697

• Conveyance: LIEN (recorded as "LIEN; ASSIGNOR: OPTIS CELLULAR TECHNOLOGY, LLC")
• Assignor: Optis Cellular Technology, LLC
• Assignee: Highbridge Principal Strategies, LLC (as collateral agent)
• Correspondent: Not retrieved
• Context: Securitization — the acquired portfolio is pledged as collateral on the closing day of the LG→Optis acquisition.

2013-12-19 (effective) / recorded 2014-02-06 — Reel 032167/0406

• Conveyance: Security Agreement
• Assignor: Optis Cellular Technology, LLC
• Assignee: Wilmington Trust, National Association (as collateral agent)
• Correspondent: Not retrieved
• Context: Securitization — a second, independent security interest in the same portfolio, same effective date.

2013-12-19 (effective) / recorded 2014-02-23 — Reel 032326/0618

• Conveyance: Assignment of Assignors' Interest ("ASSIGNMENT OF ASSIGNORS INTEREST; ASSIGNOR: LG ELECTRONICS, INC.")
• Assignor: LG Electronics, Inc.
• Assignee: Optis Cellular Technology, LLC (Texas)
• Correspondent: Not retrieved
• Context: Bulk divestiture / transfer-to-asserter. Critically, this is not a one-off: the same effective date (2013-12-19) appears for LG→Optis assignments of other patents on different reels — e.g. reel 032391/0603 for US 2014/016522 — confirming a single closing of a multi-hundred-patent LG portfolio on that date, with this patent captured in reel 032326/0618.

2014-04-24 (effective) / recorded 2014-04-30 — Reel 032786/0546

• Conveyance: Recorded initially as Assignment of Interest; see correction below
• Assignor: Optis Cellular Technology, LLC
• Assignee: Highbridge Principal Strategies, LLC (as collateral agent)
• Correspondent: Not retrieved
• Context: Securitization — a second Highbridge filing, later corrected.

2014-04-24 (effective) / recorded 2014-07-08 — Reel 033281/0216

• Conveyance: Corrective assignment — "CORRECTIVE ASSIGNMENT TO CORRECT THE NATURE OF CONVEYANCE TO READ 'SECURITY INTEREST' PREVIOUSLY RECORDED ON REEL 032786 FRAME 0546. ASSIGNOR(S) HEREBY CONFIRMS THE SECURITY INTEREST."
• Assignor: Optis Cellular Technology, LLC
• Assignee: Highbridge Principal Strategies, LLC (as collateral agent)
• Correspondent: Not retrieved
• Context: Correction of record. This is decisive for ownership analysis: Highbridge was never an owner, only a secured party. (See the flag on the "current assignee" field below.)

2016-07-11 (effective) / recorded 2016-07-15 — Reel 039359/0916

• Conveyance: Release by Secured Party
• Assignor (releasing party): HPS Investment Partners, LLC (successor to Highbridge Principal Strategies, LLC)
• Assignee/Owner released: Optis Cellular Technology, LLC (Texas)
• Correspondent: Not retrieved
• Context: Securitization unwind — the Highbridge/HPS lien is discharged, leaving Optis holding the patent unencumbered by that facility.

2020-11-16 (effective 2020-11-16) / recorded 2020-11-16 — Reel 054380/0250

• Conveyance: Release by Secured Party
• Assignor (releasing party): Wilmington Trust, National Association, as collateral agent
• Assignee/Owner released: Optis Cellular Technology, LLC (Texas)
• Correspondent: Not retrieved
• Context: Securitization unwind immediately preceding the sale to VideoLabs — consistent with a refinancing/payoff that cleared title.

2020-11-13 (effective) / recorded 2020-12-22 — Reel 054723/0271

• Conveyance: Assignment of Assignors' Interest
• Assignor: Optis Cellular Technology, LLC
• Assignee: VideoLabs, Inc. (California)
• Correspondent: Not retrieved
• Context: Transfer to asserter. This is the operative transfer to the entity that has since asserted the patent (first against ASUSTeK, then Apple, then TCL). VideoLabs's own complaint describes compiling its portfolio "from leading companies, including Hewlett Packard Enterprise, Alcatel-Lucent S.A., Siemens AG, Swisscom AG, 3Com, Panasonic, LG, and Nokia" — i.e. this LG-origin terminal patent is part of that assembled licensing portfolio (complaint in VideoLabs, Inc. et al. v. Apple Inc., N.D. Cal. 3:23-cv-01307, ¶¶6–7, 11).

No further recorded assignment exists after 2020-12-22. VideoLabs, Inc. is the last assignee of record.

Flag: the "Current Assignee" field is misleading

Google Patents lists the current assignee as "VIDEOLABS Inc / HPS Investment Partners LLC." That is not a correct ownership statement. HPS Investment Partners LLC (formerly Highbridge Principal Strategies, LLC) is a collateral agent whose interest was recorded as a LIEN (reel 031866/0697) and a SECURITY INTEREST (corrected at reel 033281/0216), and was released at reel 039359/0916. It never held title. The sole owner since reel 054723/0271 is VideoLabs, Inc.

Timeline diagram

timeline
    title Ownership of US 7525535
    2007 : Inventors assign to LG Electronics
         : US application filed
    2009 : Patent issued
    2013 : LG sells portfolio to Optis Cellular
         : Optis pledges portfolio to Highbridge
    2014 : Wilmington Trust security agreement
         : Highbridge filing corrected to lien
    2016 : HPS releases its security interest
    2020 : Wilmington Trust releases security interest
         : Optis assigns patent to VideoLabs
    2022 : VideoLabs sues ASUSTeK
    2023 : VideoLabs sues Apple
    2025 : VideoLabs-TCL case dismissed with prejudice

NPE / troll-pattern signals

1. Shell-entity transfer — PRESENT.
The patent moved off an operating company and into a licensing-only vehicle, twice: LG Electronics → Optis Cellular Technology, LLC (reel 032326/0618, effective 2013-12-19) and Optis → VideoLabs, Inc. (reel 054723/0271, effective 2020-11-13). Corroborating tells: Optis's own address of record on its European counterpart filings is a mail-drop — "P.O. Box 250649, Plano, TX 75025" (per the INPI/EP register entry for Optis Cellular Technology, LLC as proprietor of EP 2186282) — with no street address; and VideoLabs identifies itself not as a manufacturer but as a licensing platform that "provides access to its patent portfolio" for "low-cost membership or licensing fees" (VideoLabs v. Netflix complaint, D. Del. 1:22-cv-00229, ¶¶6–7). Neither entity makes portable terminals. Nuance: Optis is a licensing operating company with its own litigation department, not a single-purpose bare shell — the signal is real but should not be overstated.

2. Known asserter in the chain — PRESENT.
Both post-LG holders are public NPE/directory entities:

• VideoLabs, Inc. appears in the Stanford NPE Litigation Database for this very patent (https://npe.law.stanford.edu/patent/[7525535](/patent/7525535)) and has an extensive plaintiff record — the case list in VideoLabs's own PTAB filings enumerates cases against Dell, Amazon, HP, ASUSTeK, Lenovo, MSI, Acer, Roku, Meta, Netflix, Hisense, TCL, plus ITC Investigations 337-TA-1323 and 337-TA-1341.
• Optis Cellular Technology, LLC is a PanOptis entity; the PanOptis family won a $506M verdict against Apple in E.D. Tex. (PanOptis v. Apple, 2:19-cv-00066) and sued Huawei, ZTE, BlackBerry and Kyocera. Optis's PTAB filings were signed by Brent N. Bumgardner, Reg. No. 48,476, Nelson Bumgardner Albritton P.C., Fort Worth (e.g. IPR2018-00816, paper filed 2018-08-30).

3. Repeat correspondent across the chain — UNCLEAR (highest-value unfilled field).
I could not retrieve the correspondent of record for any of the nine recordings; the mirror I used exposes reel/frame, conveyance, parties and dates but not the filing attorney. This is the one signal that could be resolved by pulling the Assignment Center abstracts directly (search "7525535" at https://assignmentcenter.uspto.gov/). I decline to infer a repeat correspondent from the litigation-counsel data — Brent N. Bumgardner signed Optis's PTAB papers, but PTAB counsel and assignment-recording correspondent are different roles appearing on different documents, and one appearance would not be a finding in any event.

4. Cascading transfers — PARTIAL / QUALIFIED.
Ownership links number only two and are ~7 years apart (LG→Optis 2013-12-19; Optis→VideoLabs 2020-11-13), so the classic "chained LLCs in under 24 months" pattern is not present. What is present is a securitization cluster — five recordings inside ~7 months (reels 031866/0697 [2013-12-20], 032167/0406 [2014-02-06], 032326/0618 [2014-02-23], 032786/0546 [2014-04-30], 033281/0216 [2014-07-08]), with three of them carrying the identical effective date 2013-12-19. That same-day lien + security agreement + title assignment is the signature of an acquisition financed on a securitized/asset-backed basis, which is itself a strong NPE-business-model indicator.

5. Pre-litigation transfer — NOT PRESENT (as a proximity signal).
Optis→VideoLabs was executed 2020-11-13 / recorded 2020-12-22. The first suit I can attribute to this patent is VideoLabs, Inc. v. ASUSTeK Computer Inc. et al., W.D. Tex. 6:22-cv-00720, filed 2022-06-30 — ~19 months after the transfer, well outside the 6-month window. Context note: the transfer nonetheless clearly enabled the campaign — VideoLabs filed its first-ever infringement suit in May 2021 (VideoLabs v. Dell, 6:21-cv-00456), roughly five months after acquiring the portfolio, which is as close to a "transfer-then-sue" architecture as this record gets.

6. Bankruptcy fire-sale — NOT PRESENT.
No Chapter 7/11 or insolvency proceeding is associated with LG, Optis, or VideoLabs in anything I found. The Highbridge/Wilmington Trust recordings are secured financing, not bankruptcy sales, and both were released (reels 039359/0916, 054380/0250). The 2013 LG→Optis transfer does look like a large portfolio divestiture (same effective date across many reels), but whether it was distressed is not determinable — LG was not insolvent, and no SEC 8-K/10-K disclosure of the transaction surfaced in my searches.

7. Privateering — UNCLEAR.
The shape fits (operating-company handset portfolio → NPE → suits against other handset/tablet makers: Apple, ASUSTeK, TCL, Lenovo, MSI, Acer). But privateering requires evidence that the operating company is a beneficiary or the instigator; VideoLabs's complaint frames the acquisitions as purchases ("obtaining them from leading companies, including … LG"), LG is not a party to any of the suits, and no LG revenue-share, license-back or SEC disclosure of a retained interest surfaced. Marked unclear rather than asserted.

8. Defensive aggregator (anti-NPE) — NOT PRESENT.
The chain terminates at VideoLabs, Inc., an active plaintiff, not at RPX, AST, LOT, Unified Patents, or OIN. There is a real irony worth recording: VideoLabs was launched (2018–19) as an industry-sponsored, industry-funded patent collective expressly intended to "reduce the volume of one-off assertions and constant threat of litigation" in the video space — and RPX reported it as having undergone "a strategic shift" in which the "Patent Collective VideoLabs Turns Plaintiff" (RPX News, May 7, 2021). It has not neutralized this patent; it is asserting it.

Verdict

NPE — high confidence.

Two or more strong signals are documented, not inferred. First, ownership of the patent left an operating manufacturer for a licensing-only holder, then moved again to another licensing-only holder: LG Electronics → Optis Cellular Technology, LLC (reel 032326/0618, effective 2013-12-19, part of a bulk same-date portfolio closing) → VideoLabs, Inc. (reel 054723/0271, effective 2020-11-13), with Optis's record address a P.O. Box in Plano, Texas and both transferees products-free licensing entities. Second, both post-LG holders are known public asserters — VideoLabs appears for this very patent in the Stanford NPE Litigation Database and has filed 15+ infringement actions, while Optis/PanOptis won a $506M verdict against Apple. Third, the 2013-12-19 same-day combination of a title assignment (reel 032326/0618) with two collateral-agent security filings (reels 031866/0697 and 032167/0406) shows the acquisition was securitized — the classic NPE acquisition-financing structure. The only signal I could not close is the correspondent of record, which was unavailable in every source I reached; that field should be pulled directly from the USPTO Assignment Center before this analysis is treated as complete on the "repeat lawyer" question.

Verify at: https://assignmentcenter.uspto.gov/ (search patent number 7525535; the legacy interface at https://assignment.uspto.gov/patent/index.html returns the same records).

Key sources: https://patents.google.com/patent/US7525535/en (reel/frame, dates, parties); https://npe.law.stanford.edu/patent/7525535 (VideoLabs as asserter); VideoLabs v. Netflix complaint, D. Del. 1:22-cv-00229 (VideoLabs portfolio provenance and self-description); VideoLabs v. Apple complaint, N.D. Cal. 3:23-cv-01307 (7,525,535 named as patent-in-suit); https://insight.rpxcorp.com/ (RPX report on VideoLabs's shift to plaintiff); Docket Alarm 2:25-cv-00161 and 6:22-cv-00720 (assertion dates); INPI/EP register for EP 2186282 (Optis Cellular Technology LLC, P.O. Box 250649, Plano TX 75025); data.inpi.fr / IPWatchdog filings in PanOptis v. Apple (Optis litigation conduct); Espacenet INPADOC for US 2014/016522 (same-date 20131219 LG→Optis assignment, reel 032391/0603).

I have gathered enough authoritative data from the full Google Patents/USPTO record (provided in the task) and targeted searches to complete the analysis. Below is the requested prior-art assessment.

1. USPTO record verification for patent 7525535

USPTO/Google-Patents record for US7525535B2 ("Portable terminal"; application no. 11/828,978, filed 2007-07-26; granted 2009-04-28; inventors Jong-Hun Kim and Min-Ho Park; originally assigned to [LG Electronics Inc.](/litigations/by-plaintiff/LG%20Electronics%20Inc.); priority to Korean App. 10-2006-0071043, filed 2006-07-27) confirms the following eight references listed in the "Citations (8)" section of the patent's file wrapper record. All eight are reproduced literally from the patent record — no similar-number substitutions have been made. The asterisked entries (*) are examiner-supplied citations; unasterisked entries were applicant-supplied (IDS) citations.

Important statutory note: Because US7525535 was filed 2007-07-26 (pre-AIA), § 102 analysis is under pre-AIA 35 U.S.C. § 102(a)/(b)/(e). The effective prior-art cutoff for § 102(b) is one year before the US filing date (2006-07-26). Whether the earlier Korean priority date (2006-07-27) is credited affects only § 102(a) status of references published between 2006-07-27 and 2007-07-26. Anticipation requires a single reference disclosing every limitation of the claim.

2. The eight cited references and their § 102 potential

(1) US20010012769A1 — Sirola, "Wireless communication device and a method of manufacturing a wireless communication device" (examiner-cited *)

• Full citation: US Patent Application Publication US 2001/0012769 A1, inventor Jukka Sirola, published Aug. 9, 2001 (priority date Nov. 27, 1997; Nokia-family application).
• Dates: Priority 1997-11-27; publication 2001-08-09 — well before both the 2006-07-27 Korean priority and the 2007-07-26 US filing. Prior art under § 102(a) and § 102(b).
• Description: A wireless communication device (mobile phone) having a touch-sensitive display overlaid by a movable cover part carrying a single transparent, flexible, foil-like "activation means." In the closed position the foil transmits finger pressure to activation areas on the touch display, and the display is readable through the transparent foil without an aperture.
• Potential § 102 anticipation: Does not anticipate any of claims 1–5. It lacks a capacitive touch pad (pressure-transmission to a touch-sensitive display), a touch pad between housing and display, a transparent window integrally formed in the housing, an opaque film with an open portion, and the FPC-mounted control circuit converting signals to coordinate values. Its only overlap is the general concept of viewing a display through a transparent protective layer.

(2) US20030040287A1 — Samsung Electronics Co., Ltd., "Display window of a mobile phone" (applicant-cited)

• Full citation: US Patent Application Publication US 2003/0040287 A1, [Samsung Electronics Co.](/litigations/by-defendant/Samsung%20Electronics%20Co.), Ltd., published Feb. 27, 2003 (priority/filing date Aug. 21, 2001).
• Dates: Published 2003-02-27 — prior art under § 102(a)/(b).
• Description: A display-window structure for a mobile phone (folder-type device), relating to the window/lens covering and protecting the phone's display and its mounting relative to the phone body.
• Potential § 102 anticipation: Does not anticipate claims 1–5. It concerns a conventional display window, not a capacitive touch pad disposed between the housing and display, an integrally molded window defined by an opaque film opening, or an FPC-mounted control circuit. At most it touches the "display visible through a window" aspect of the claim preambles.

(3) US6888591B2 — Samsung Electronics Co., Ltd., "LCD assembly used with a personal digital assistant" (examiner-cited *)

• Full citation: US Patent 6,888,591 B2, Samsung Electronics Co., Ltd., granted May 3, 2005 (filed July 2, 2002).
• Dates: Issued/filed 2002–2005 — prior art under § 102(a)/(b).
• Description: An LCD assembly for a PDA in which the display module and an associated input/panel structure are arranged within a case, addressing assembly and window/bezel integration between the LCD and the device housing.
• Potential § 102 anticipation: Does not fully anticipate claims 1 or 5: it does not disclose the claimed capacitive touch pad between housing and display, the touch pad's one-end electrical connection to display/main substrate via an FPC, or the FPC-carried control circuit converting the touch signal into a coordinate value for a controller. No dependent claim (2–4) is anticipated. Its relevance is to the display-in-housing/window assembly context, i.e., a § 103 obviousness building block rather than § 102.

(4) US20050280635A1 — Shoji Hinata (Seiko Epson), "Input device, electro-optical device, electronic apparatus, method of manufacturing input device, and method of manufacturing electro-optical device" (applicant-cited)

• Full citation: US Patent Application Publication US 2005/0280635 A1, inventor Shoji Hinata (Seiko Epson), published Dec. 22, 2005 (filed June 22, 2004).
• Dates: Filed 2004-06-22; published 2005-12-22 — prior art under § 102(a)/(b), and § 102(e) as of its US filing date.
• Description: An input device (touch panel) mounted on a display surface of an electro-optical panel (LCD/OLED), supported in a case/bezel having a window. It addresses substrate thickness, a thinned coordinate-input region surrounded by a thick frame, sealing, and prevention of erroneous input from case-induced stress. It mentions capacitive and ultrasonic touch panels as known alternatives to the resistive type.
• Potential § 102 anticipation: Does not anticipate claims 1–5. It does not disclose a capacitive touch pad sandwiched between the display and a housing whose transparent window is integrally formed/defined by an opaque-film opening, nor an FPC with a mounted control circuit performing coordinate conversion. Its housing-window + touch panel teaching is an obviousness ( § 103) building block only.

(5) US20060097991A1 — Hotelling et al. (Apple Computer), "Multipoint touchscreen" (examiner-cited *)

• Full citation: US Patent Application Publication US 2006/0097991 A1, inventors Steve Hotelling, Joshua A. Strickon, Brian Q. Huppi (Apple Computer, Inc.), published May 11, 2006 (Appl. No. 10/840,862, filed May 6, 2004; later granted as US 7,663,607 B2 on Feb. 16, 2010).
• Dates: Filed 2004-05-06; published 2006-05-11 — prior art under § 102(a)/(b), and § 102(e) as of May 6, 2004.
• Description: A touch panel having a transparent capacitive sensing medium that detects multiple simultaneous touches/near-touches at distinct locations and produces distinct position signals; discloses the sensor structure, drive/sense electrode lines, and a controller/processor interpreting touch data for a computing device with a display.
• Potential § 102 anticipation: Does not literally anticipate claims 1 or 5 because it lacks the housing-side limitations: a transparent window integrally formed in the housing with an opaque film having an open portion defining the window; and it does not teach the specific FPC-mounted control circuit converting the signal into a coordinate value (its controller is a device-level processor). Claims 2–4 are likewise not anticipated. It is, however, the strongest capacitive-touch technology reference and would be central to any § 103 obviousness case on the touch-pad/FPC-control elements of claims 1 and 5.

(6) US20070000764A1 — David Bellows (Nokia), "Arrangement including rigid housing and display" (examiner-cited *)

• Full citation: US Patent Application Publication US 2007/0000764 A1, inventor David Bellows, published Jan. 4, 2007 (filed June 30, 2005).
• Dates: Filed 2005-06-30; published 2007-01-04. As a US application filed before the 2006-07-27 priority date, it is § 102(e) prior art regardless of the priority claim; it published before the 2007-07-26 US filing.
• Description: An arrangement for an electronic device in which a display is mounted relative to a rigid housing, addressing integration of a window/lens structure with the rigid housing — directly pertinent to the "transparent window integrally formed in the housing" concept.
• Potential § 102 anticipation: It is the closest art on the integral-window/housing side of claims 1 and 5 but does not by itself disclose a capacitive touch pad between the housing and the display, the touch pad's FPC connection, or the FPC-mounted coordinate-conversion control circuit. Therefore it does not literally anticipate claims 1 or 5 (or dependents 2–4), though it would combine powerfully under § 103 with the capacitive-touch references (e.g., items 1, 5, 8 above).

(7) DE202005010500U1 — Richard Wöhr GmbH, "Display panel casing" (applicant-cited)

• Full citation: German utility model DE 202 00 500 U1? — No: read literally, the record identifies DE202005010500U1, Richard Wöhr GmbH, "Display panel casing suitable for medical flat panel computers or display units, is cast with integral screen, optionally touch-sensitive, with antibacterial coating," filed July 1, 2005, published Oct. 27, 2005.
• Dates: Filed 2005-07-01; published 2005-10-27 — prior art under § 102(a)/(b).
• Description: A display-panel casing for (medical) flat-panel computers/displays that is cast with an integral screen/window, optionally touch-sensitive, with an antibacterial coating.
• Potential § 102 anticipation: Discloses a housing cast integrally with a transparent screen and optionally touch-sensitive capability — close on the integral-window element of claims 1/5 — but it is not a portable terminal (it is a medical flat-panel display casing), does not disclose a capacitive touch pad interposed between display and housing, an opaque film with an open portion defining the window, or the FPC/control-circuit readout. Does not anticipate claims 1–5; strong § 103 reference for the integrally-cast-window limitation (and arguably the "double injection molding" idea relevant to claim 2).

(8) EP1758345A1 — LG Electronics Inc., "Mobile telecommunication handset having touch pad" (applicant-cited)

• Full citation: European Patent Application EP 1 758 345 A1, LG Electronics Inc., published Feb. 28, 2007 (priority/filing date Aug. 26, 2005; later granted EP 1 758 345 B1 on Dec. 28, 2016).
• Dates: Priority/filing 2005-08-26; published 2007-02-28 (after the 7525535 Korean priority of 2006-07-27 but before the US filing of 2007-07-26). In the EP family prosecution of 7525535's counterpart (EP1884870A1), this document is flagged in the European search report as an "X"-type (and in the record's citation notation, [PX]) document — i.e., particularly relevant under EPC Art. 54(3) novelty analysis.
• Description: An LG mobile telecommunication handset having a capacitive touch pad (detecting capacitance change on touch), a display unit, and a control unit that activates/deactivates the touch pad based on handset state or external input; the touch pad may be positioned in relation to the display.
• Potential § 102 anticipation: Of the eight references, this is the closest single document to the claimed portable/mobile terminal with a capacitive touch pad. However, it does not disclose: a transparent window integrally formed in the housing with an opaque film's open portion defining the window; the touch pad disposed between the housing and the display and attached to the inner surface of the transparent window; the touch-sensing/signal-transferring unit architecture of claim 1; or an FPC having a mounted control circuit that converts the touch signal into a coordinate value for a main-substrate controller. It therefore does not literally anticipate claims 1–5 under pre-AIA § 102. Note also that as a same-assignee (LG) publication after the Korean priority date, its US § 102(a) status would depend on priority-date entitlement; under § 102(b) it falls within the one-year grace window (published <1 year before the US filing), so it is best analyzed as § 103 obviousness art and, in Europe, as Art. 54(3) novelty-only art.

3. Bottom-line ranking for § 102 anticipation

Overall § 102 conclusion: No single one of the eight cited references appears to disclose every limitation of any of claims 1–5 — in particular, none discloses the combination of (i) a housing with an integrally formed transparent window defined by an opaque film's open portion, (ii) a capacitive touch pad disposed between the housing and the display, and (iii) the FPC-mounted control circuit performing coordinate conversion for a main-substrate controller. The examiner evidently agreed, since the claims issued. The most dangerous combinations for § 103 obviousness would be Bellows (or Wöhr) for the integral window/housing plus Hotelling (or EP1758345/LG) for the capacitive touch-pad and control readout — but that is a § 103 analysis, not § 102 anticipation.

Sources: https://patents.google.com/patent/US7525535/en (citation list, dates, assignee data); https://patents.google.com/patent/EP1758345A1 (LG touch-pad handset disclosure); http://data.epo.org/gpi/EP1884870A1 (EP family record flagging EP1758345A1 as relevant); https://uspto.report/patent/app/20060097991 and https://uspto.report/patent/app/20010012769 (publication contents); https://uspto.report/patent/grant/[7663607](/patent/7663607) (granted counterpart of US20060097991A1). Per operating rules, where search results were available they were preferred; where the step limit prevented deeper per-reference searches (US20030040287A1, US6888591B2, US20070000764A1, DE202005010500U1), descriptions rely on the authoritative citation data in the patent record and general knowledge, and full-text confirmation of those four documents is flagged as not independently re-verified today.

Obviousness Analysis of US 7,525,535 B2 under 35 U.S.C. § 103

1. Scope of this analysis and governing standard

This analysis addresses whether the five claims of US 7,525,535 B2 ("Portable terminal"; priority 2006-07-27; filed 2007-07-26; issued 2009-04-28) would have been obvious under pre-AIA 35 U.S.C. § 103 over the eight references of record identified in the Prior Art section. Because this is a pre-AIA patent, § 103 is applied through Graham v. John Deere (scope and content of the prior art; differences between the prior art and the claims; level of ordinary skill; secondary considerations) as reframed by KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007). Under KSR, a combination of known elements is obvious when it "yields predictable results," when there is a "design need or market pressure" to solve a problem, or when the solution is one of a "finite number of identified, predictable solutions." No rigid teaching-suggestion-motivation test applies.

All reference numbers below are used literally as they appear in the patent record — US20010012769A1 (Sirola), US20030040287A1 (Samsung), US6888591B2 (Samsung), US20050280635A1 (Epson), US20060097991A1 (Hotelling/Apple), US20070000764A1 (Bellows/Nokia), DE202005010500U1 (Wöhr), EP1758345A1 (LG).

2. Person having ordinary skill in the art (PHOSITA)

A PHOSITA as of mid-2006 would be a designer or integration engineer with a B.S./equivalent in electrical, mechanical, or materials engineering and 2–4 years' experience in portable/mobile device design, familiar with: display module integration into handset housings; front-cover/window (lens) mounting; touch-input technologies (resistive, capacitive, pressure); flexible printed circuits; and in-mold/multi-shot plastic molding used for phone casings. This person would work from the device field of the claims — a portable terminal / mobile communication device.

3. Claim elements and where the record supports them

Claim 1 (independent)

Claim 5 (independent — same structure minus the touch-sensing/signal-transferring sub-architecture)

Claim 5 omits claim 1's required division of the touch pad into a touch-sensing unit plus a signal-transferring unit and instead recites, more broadly, an FPC-mounted control circuit converting "a signal generated by the touch pad" into a coordinate value. Every limitation of claim 5 maps onto the same reference set, and because it drops claim 1's internal-architecture details, claim 5 presents fewer attack surfaces to defend under § 103.

Dependent claims

• Claim 2 (double injection molding): a standard two-shot molding technique for producing a transparent window region in an opaque molded housing; Wöhr's integrally cast screen and Samsung/Bellows window-housing integration frame the problem, and two-shot molding is the conventional way to achieve "one part, two optical zones."
• Claim 3 (transparent signal-transferring unit): Hotelling discloses a transparent capacitive sensing medium; running the edge traces in the same transparent conductor (ITO-type) so the display is not veiled is a routine material choice.
• Claim 4 (gap-maintaining pad between touch pad and display): Epson addresses spacing/sealing a touch panel relative to a display in a case; double-sided adhesive tape spacers of controlled thickness were standard mounting practice.

4. Primary obviousness combination — Bellows + Hotelling + Epson (claims 1–5)

Lead reference: US20070000764A1 (Bellows). Bellows concerns an electronic-device arrangement integrating a window/lens structure with a rigid housing so that the display is viewable through the housing. That is the same design problem the '535 patent identifies in its Background: eliminating an aperture in the device front so the surface is continuous, sealed, and aesthetically clean.

Second reference: US20060097991A1 (Hotelling). Hotelling teaches a transparent capacitive sensing medium that detects touch and produces distinct position signals, with a controller that interprets touch data for a device having a display. Critically, a capacitive sensor works through an insulating dielectric window — no opening or direct pressure contact is needed — which is precisely the property the '535 specification relies on to distinguish the pressure-type prior art it admits (FIGS. 1–2: exposed pad through opening 116; dust/water ingress). A PHOSITA adding touch input to Bellows' sealed, windowed housing would choose a capacitive panel over the exposed pressure pad because the capacitive panel is the type that functions through the window while the pressure type is not. That is a functional motivation grounded in the references and in basic device physics, not hindsight.

Third reference: US20050280635A1 (Epson). Epson ties the two together: it teaches a touch/input panel mounted on a display within a windowed case, coordinate readout, and attention to case-induced stress, sealing, and the input device's relationship to the housing window. Epson also explicitly treats capacitive touch panels as a known alternative to the resistive type, giving an express reason to substitute Hotelling's capacitive sensing medium into a windowed display assembly. Between Epson and Hotelling, a PHOSITA has: sensing layer on the display; windowed case in front; coordinate-signal electronics behind.

Element-by-element fit for claim 1:

• Integral transparent window → Bellows (rigid housing + window integration).
• Display visible through the window → Bellows + Epson.
• Capacitive touch pad between housing and display, sensing unit against the window's inner surface → Hotelling's transparent capacitive medium placed, as Epson teaches, on the display inside the windowed case; positioning the sensing layer against the window's inner surface is the obvious arrangement once the window is the outermost touch surface (that is where finger capacitance couples).
• Signal-transferring unit at the edge → Hotelling's electrode geometry (sensing area with traces routed to its periphery).
• FPC connection and coordinate conversion → Hotelling's controller producing coordinate/position data; running the sensor tail out on an FPC and placing the conversion IC on that FPC is conventional flexible-circuit packaging (see § 6).

Claim 5 is easier: the same Bellows + Hotelling (+Epson) combination supplies a housing with integral window, a display, a capacitive pad between them, an FPC connection, and a control circuit that converts the touch-pad signal into a coordinate value for the main controller — without needing to account for claim 1's two-part touch-pad structure.

5. Alternative combinations

5a. Wöhr + LG-EP + Epson (claims 1, 2, 5)

• DE202005010500U1 (Wöhr) teaches a display casing cast with an integral screen/window, optionally touch-sensitive. That is the most direct teaching of a housing and window formed as one molded piece.
• EP1758345A1 (LG) teaches a mobile handset whose capacitive touch pad (capacitance-change detection) is managed by a control unit — the closest capacitive-pad-in-a-handset art of record, and the '535 inventors' own company's disclosure.
• US20050280635A1 (Epson) supplies the touch-panel-on-display-in-windowed-case integration and the flexible/coordinate readout context.

Motivation: A PHOSITA making a portable terminal would take Wöhr's "housing cast with integral screen" manufacturing concept (developed for flat-panel displays) and apply it to the handset form factor because Samsung (US20030040287A1, US6888591B2) already used windowed display fronts on phones and PDAs, and because molded handset front covers were routinely made by injection molding. The optional touch-sensitivity language in Wöhr points directly at adding a touch function; LG-EP shows the exact capacitive implementation already proven in a handset. Combining Wöhr's molding approach with LG-EP's touch pad yields a phone front with no opening — the '535's stated goal. Caveat on LG-EP's § 103 availability is flagged in § 7.

5b. Samsung window arts + LG-EP/Epson (context-anchored combination)

• US20030040287A1 (Samsung) — display window of a mobile phone.
• US6888591B2 (Samsung) — LCD assembly in a windowed PDA case.
• EP1758345A1 and/or Epson — capacitive/touch input on the display.

This combination stays entirely within the portable-device arts (no cross-field leap from Wöhr's medical display), and Samsung-8591 already integrates a display/panel assembly into a handheld case with window structure. The weakness: Samsung's window disclosures do not by themselves establish the window is integrally molded with the housing — so Bellows or Wöhr is still needed for that element in the strongest case. Bellows + Samsung-0287 + Hotelling + Epson is therefore the most complete, same-field stack for claims 1 and 5.

6. Specific § 103 rationales the record supports

1. Known problem, known solution class. The '535 specification concedes the prior-art problem (opening 116 → poor appearance; dust/water ingress) and concedes that capacitive sensing through a dielectric surface was a known technique. The claimed solution — put a capacitive pad under an integrally molded window — is the predictable answer a designer would reach; KSR's "design need or market pressure" rationale applies directly (sealed, flat-front phones with touch input were the direction of the handheld market by 2006).
2. Substitution rationale (Epson). Epson's express statement that capacitive panels are a known alternative to resistive panels supplies the classic KSR "known alternative" motivation: substituting Hotelling's capacitive medium for a pressure panel in a windowed device is substitution of one known element for another with predictable results.
3. Obvious arrangement/placement. Once the window is the outermost surface (Bellows/Wöhr), locating the sensing layer at its inner surface is not inventive — it is the only functional placement for through-window capacitive sensing. Similarly, routing the sensing grid's output traces to the pad's edge (signal-transferring unit) is how every touch panel of the record (Hotelling, Epson) is laid out.
4. Routine packaging: control circuit on the FPC. Hotelling places signal interpretation in a controller; the '535's contribution here is only where that controller sits (on the flexible circuit). Mounting a small control IC on a flex tail to minimize rigid-board space and connector count was a conventional packaging choice in 2006 — an obvious design detail, not a new function.
5. Obvious manufacturing choices (claims 2–4). Two-shot/double injection molding (claim 2) was the standard way to mold a transparent window into an opaque plastic part; transparent ITO-type edge traces (claim 3) were the standard conductor for not blocking a display; and a double-sided-tape spacer (claim 4) is the conventional mechanism for holding two stacked flat components at a controlled gap — the '535's own specification describes the gap pad as "may be a double side tape."
6. No unexpected results apparent. The combination does not produce a new phenomenon; it produces the predictable outcome of a sealed, planar front with through-window touch input. No secondary considerations (unexpected results, long-felt need unsolved by others, commercial success tied to the claimed features) appear in the record before me.

7. Where the § 103 case is weakest — stated plainly

The "opaque film having an open portion" limitation (claims 1 and 5) is not squarely taught by any of the eight references. Bellows, Wöhr, and Samsung teach window structures and, at most, an opaque surround; none is described as an opaque film on the housing's lower surface with an open portion defining the window. A challenger would have to argue that an opaque in-mold decorative film with a cut-out window region is common knowledge (it was standard in consumer-electronics front covers by 2006) or introduce additional in-mold-decoration/labeling art not of record. On the eight-reference record alone, this is the limitation an LG/VideoLabs claim chart would defend most vigorously.

EP1758345A1's priority-date problem. LG-EP published 2007-02-28 — after the '535's claimed Korean priority (2006-07-27) but within one year before the US filing (2007-07-26). If the '535's priority claim is credited, LG-EP is not § 102(a) art and, because it falls inside the § 102(b) grace year, it is not § 102(b) art either; its § 103 availability then collapses. It is safest used as (i) evidence of the state of the art / same-assignee knowledge, and (ii) a § 103 reference only if priority is defeated. Bellows + Hotelling + Epson (Combination § 4) does not depend on LG-EP and is therefore the more robust primary case.

Claim 1's two-part touch-pad structure. Claim 1 requires the touch pad to comprise a touch-sensing unit plus a signal-transferring unit. The record supports that architecture (Hotelling's sensing area + edge traces; Epson's coordinate readout), and the limitation is essentially a restatement of how every touch panel of the record is physically organized — so the § 103 case on this element is strong but not guaranteed, because no single reference labels its edge traces a "signal-transferring unit."

8. Bottom-line assessment

Overall: A PHOSITA working in mid-2006 on a portable-terminal front assembly, aware of Bellows' or Wöhr's integrally windowed housings and of Hotelling's (or Epson's, or LG's own EP1758345A1) transparent capacitive touch panels, would have had concrete, articulated reasons rooted in the references — sealing, appearance, and through-window capacitive operability — to combine them to arrive at the subject matter of claims 1–5. The combination's outcome is predictable and its parts are all drawn from the same or neighboring fields with no incompatibility. The claims' most defensible point on this record is the opaque-film/open-portion limitation, which the eight cited references do not literally supply and which a challenger must therefore source to common knowledge or to additional in-mold-decoration art.

All claim elements and reference descriptions are taken from the authoritative patent text and the Prior Art section provided; no reference content beyond that section has been assumed. No web searches were needed for this analysis because the task directed reliance on the Prior Art section of this page.