US 6755547

I'll search for authoritative information on US patent 6755547, including its current legal status and any CAFC 2026 docket activity.

Let me refine my search for litigation and PTAB activity specific to this patent, and check current USPTO status.

Let me check specifically for any 2026 Federal Circuit activity and current litigation involving this patent.

US Patent 6,755,547 — Summary

Important caveat up front: I found no evidence of any 2026 Federal Circuit (CAFC) docket activity involving patent 6,755,547. My targeted searches returned no 2026 CAFC results for this number, and the patent's recorded legal status is "Expired – Fee Related" with an anticipated expiration of 1995‑06‑27 + 20 years = 2015‑06‑27. If a genuine 2026 appeal exists, I could not locate or verify it, and I will not fabricate one. All data below comes from the patent text you provided plus the searches I ran (Google Patents, USPTO/PTAB filings, and district‑court records).

Bibliographic Data

Family/continuity: The '547 patent is a division of US 09/256,275 (filed 1999‑02‑23, now US 6,712,481 B2), which was a continuation‑in‑part of US 08/778,089 (filed 1997‑01‑02, now US 6,079,838), which was a division of US 08/495,176 (filed 1995‑06‑27, now US 5,613,751). This is one member of a very large 34‑application family.

Assignment chain (per recorded reassignments): Parker → Solid State Opto Limited (2002‑09‑12) → Rambus International Ltd. (2010‑02‑18) → Rambus Inc. and Rambus Delaware LLC (2013‑03‑04) → Acacia Research Group LLC (2013‑06‑26) → Innovative Display Technologies LLC (2013‑06‑27).

Abstract (verbatim)

"Light emitting panel assemblies include a sheet, film or plate overlying a light emitting member. The sheet, film or plate has a pattern of deformities on one or both sides that may vary or be random in size, shape or geometry, placement, index of refraction, density, angle, depth, height and type for controlling the light output distribution to suit a particular application. Also the sheet, film or plate may have a coating or surface treatment for causing the light to pass through a liquid crystal display with low loss."

Independent Claim 1 — Plain‑Language Overview

Claim 1 (the only independent claim): A backlight assembly comprising:

1. a light emitting member having a light emitting area that emits internally‑reflected light;
2. a separate transparent sheet or film overlying that light emitting area, with an air gap between them;
3. a pattern of deformities on one side of the sheet/film, where each deformity is very small relative to the sheet/film's overall width and length; and
4. the deformities vary at different locations (i.e., are not uniform) so they redirect the emitted light in different directions to produce a desired output distribution, such that the light passes through a liquid crystal display (LCD) with low loss.

In short: it claims an LCD backlight in which a separate transparent film (spaced from the light guide by an air gap) carries a spatially‑varying micro‑pattern of light‑redirecting deformities tuned to shape and aim the output light efficiently into an LCD.

Dependent claims 2–31 add limitations such as: variation by size (2), shape (3), placement (4), index of refraction (5), density (6), angle (7), depth/height (8), or type (9); deformities as depressions (10) or projections (11); a coating/surface treatment for low‑loss LCD transmission (12); multilayer/multi‑material film (13–14); variation to reduce moiré/interference (15); prisms/prismatic/lenticular deformities (16); random variation in size/shape/placement/density/angle/depth/type (17–23); patterns with no specific angle (24); prismatic surfaces with varying angles (25); random/varying shape changes (26); random/varying coating or surface treatment and its characteristics (27–29); coatings selected for color correction, opaqueness, diffusion, reflection, translucence, transmission (30); and touching/intersecting/overlapping deformities (31).

Litigation and PTAB History (verified)

This patent was the subject of an extensive infringement campaign by Innovative Display Technologies LLC (IDT) against device and auto makers, including numerous Eastern District of Texas and Delaware District Court actions (e.g., IDT v. Acer, 2:13‑cv‑00522; IDT v. Apple, 2:14‑cv‑00030; IDT v. LG Display, 1:13‑cv‑02109; IDT v. BMW of North America, 2:14‑cv‑00106; IDT v. General Motors, 1:14‑cv‑00850).

Key PTAB proceedings on 6,755,547 specifically:

• IPR2014‑01357 — Petitioner LG Display Co., Ltd. (filed 2014‑08‑21), challenging claims 1–4, 16, and 26. Instituted 2015‑02‑26; the Patent Owner filed a Request for Adverse Judgment (2015‑05‑28), and the Board entered a Judgment and Final Written Decision on 2015‑06‑10. Google Patents lists this as "Adverse Judgment." (Source: https://ipverse.greyb.com/ptab-web/cases/case-details/IPR2014-01357; petition: https://www.docketalarm.com/cases/PTAB/IPR2014-01357/)
• IPR2015‑00361 — Petitioner Mercedes‑Benz USA, LLC / Mercedes‑Benz U.S. International, Inc. (filed Dec. 2014); Google Patents lists the outcome as Settlement.

Because the challenged claims were subject to an adverse judgment, those claims stand disclaimed/cancelled — which, combined with the 2015 term expiry, would moot most live disputes.

Bottom Line

• The patent is US 6,755,547, "Light emitting panel assemblies," invented by Jeffery R. Parker, originally assigned to Solid State Opto Ltd, now held by Innovative Display Technologies LLC; filed 2002‑08‑30, issued 2004‑06‑29, priority date 1995‑06‑27.
• It has one independent claim (claim 1) directed to an LCD backlight with a separate transparent film placed across an air gap from an internally‑lit light guide, bearing a spatially‑varying micro‑pattern of light‑redirecting deformities tuned for low‑loss LCD transmission.
• Legal status: Expired (term ended 2015‑06‑27). Key PTAB history: IPR2014‑01357 (LG Display) → adverse judgment; IPR2015‑00361 (Mercedes‑Benz) → settlement.
• 2026 CAFC dockets: none found. I could not verify any 2026 Federal Circuit activity tied to this patent number, and I explicitly flag this as an unverified/uncertain point rather than assert that none exists.

I'll research litigation involving US 6755547 using the Unified Patents portal and other litigation sources.

Let me gather details on specific defendants, case outcomes, and the PTAB proceedings.

Let me identify the defendants in the remaining cases and confirm outcomes.

Litigation Involving U.S. Patent No. 6,755,547

Important scope note: I interpreted the identifier literally as US 6,755,547 ("the '547 patent," Light Emitting Panel Assemblies, Jeffery R. Parker, filed 2002-08-30, granted 2004-06-29). I did not include results for similar numbers (e.g., 6,755,547 is sometimes confused with the related family members 7,300,194 / 7,384,177 / 7,404,660 / 7,434,974 / 7,537,370 / 8,215,816, or with U.S. 5,613,751, the common ancestor). Where those family patents appear below, it is only because they were asserted alongside the '547 patent in the same case.

Bottom line: The '547 patent was asserted in a large, coordinated NPE campaign by Innovative Display Technologies LLC (IDT) / Delaware Display Group LLC during 2013–2015, in roughly 35+ district court actions (E.D. Tex. and D. Del.) plus PTAB proceedings. The patent is now expired (anticipated expiration 2015-06-27) and the asserted independent claims were cancelled in IPR. I found no Court of Appeals for the Federal Circuit appeal specific to the '547 patent.

1. The litigation feed surfaced from the patent record itself

The Google Patents record for US 6,755,547 (https://patents.google.com/patent/US6755547/en) lists litigation under "Family has litigation," sourced from Unified Patents' litigation dataset. The listed matters are:

E.D. Tex. (Marshall / Tyler Divisions):

D. Del.:

PTAB:

2. Independently corroborated details

These are the items I could verify from the search results (case documents, PTAB filings, and news reports), with sources:

A. The 2013 E.D. Tex. Marshall campaign (filed 2013-06-28).
IDT filed against Dell, Hewlett-Packard, Acer, Huawei, ZTE, and BlackBerry (Research In Motion), asserting seven patents including the '547 patent.

• Case Nos.: 2:13-cv-00522 (Acer Inc. et al. — later the consolidated lead case, Innovative Display Technologies LLC v. Acer Inc. et al., No. 2:13-cv-00522-JRG); 2:13-cv-00524 (Hewlett-Packard); 2:13-cv-00525 (Huawei); 2:13-cv-00526 (BlackBerry/RIM); 2:13-cv-00527 (ZTE).
• Note: 2:13-cv-00522 does not appear in the Google Patents litigation feed even though court records identify it as the lead consolidated case. The feed lists 00524–00527. Treat the case list as approximate/incomplete.
• Jurisdiction: U.S. District Court for the Eastern District of Texas, Marshall Division; Judge Rodney Gilstrap (later Judge J. Rodney Gilstrap; claim construction order 2014-08-26 in 2:13-cv-00522-JRG).
• Source: Southeast Texas Record (https://setexasrecord.com/stories/510621652-recent-patent-infringement-cases-filed-in-the-eastern-district-of-texas ); STPI/科技產業資訊室 (https://iknow.stpi.niar.org.tw/Post/Read.aspx?PostID=8222 ); Justia docket (https://cases.justia.com/federal/district-courts/texas/txedce/2:2013cv00522/[145678](/patent/145678)/71/0.pdf ).
• Outcome/status: A claim construction order was issued 2014-08-26 construing terms of the '547 and sibling patents. The asserted independent claims of the '547 patent were subsequently cancelled in IPR. I could not verify from the available results a final judgment in the consolidated case itself; the practical effect of the IPR was to eliminate the asserted '547 claims.

B. The 2013 D. Del. campaign (filed 2013-12-31).
Delaware Display Group LLC and IDT filed against Lenovo, LG Electronics/LG Display, Pantech, Sony, and Vizio, asserting the '547 patent and siblings.

• Case Nos.: 1:13-cv-02108 (Lenovo), 1:13-cv-02109 (LG), 1:13-cv-02110 (Pantech), 1:13-cv-02111 (Sony), 1:13-cv-02112 (Vizio); plus 1:13-cv-02106 and 1:13-cv-02107 (defendants not confirmed in my sources).
• Source: PTAB Revised Mandatory Notices in IPR2014-01357 (https://ptacts.uspto.gov/ptacts/public-informations/petitions/[1463666](/patent/1463666)/download-documents ); AO-120 form reproduced in IPR exhibit (https://www.docketalarm.com/cases/PTAB/IPR2014-01359/...Exhibit-1002... ). Also the Ex Parte complaint analysis of 1:13-cv-02111 (https://ai-lab.exparte.com/case/dct/ded/1:13-cv-02111/doc/analysis/1 ).
• Status: The LG matter (1:13-cv-02109) was the subject of the LG IPR. Others resolved without a verified merits judgment in my sources.

C. The 2014 automotive campaign (filed 2014-06-30 in D. Del.).
IDT v. Ford Motor Company, 1:14-cv-00849, and IDT v. General Motors LLC, 1:14-cv-00850, both D. Del., Judge Richard G. Andrews.

• Outcome (GM): Voluntarily dismissed — Stipulation of Voluntary Dismissal filed by IDT, so-ordered 2015-10-23, terminating the case (docket #50–#51, #52 report to Commissioner citing US 6,755,547 B2 and siblings). Source: UniCourt docket summary (https://unicourt.com/case/rc-db1-innovative-display-technologies-llc-v-general-motors-llc-[190273](/patent/190273) ).
• Both cases proceeded through joint claim construction briefing (Ford/GM joint brief, Oct. 2015) before settlement/dismissal.

D. PTAB IPR on the '547 patent — IPR2014-01357.

• Petitioner: LG Display Co., Ltd. (with LG Display America, Inc. as real party in interest); Patent Owner: Innovative Display Technologies LLC.
• Filed 2014-08-21; institution decision 2015-02-26; Patent Owner's Request for Adverse Judgment filed 2015-05-28; Judgment and Final Written Decision 2015-06-10.
• The petition challenged claims 1–4, 16, and 26 under §§102/103 over Ciupke, Pristash, Ohe, Nishio, Kobayashi, Matsumoto, Miller, Ohtake, Winston, Hathaway, Ouderkirk, Konno, Takeuchi, and 3M's BEF brochure.
• Sources: GreyB/IPVerse (https://ipverse.greyb.com/ptab-web/cases/case-details/IPR2014-01357 ); PTAB petition (https://www.docketalarm.com/cases/PTAB/IPR2014-01357/...Petition-1-Petition.pdf ); Faegre Drinker PTAB summaries via National Law Review.
• Effect: The Request for Adverse Judgment resulted in cancellation of the challenged claims — the principal reason the district court cases became moot as to the '547 patent.

E. IPR2015-00361 — listed in the patent's litigation feed as Settlement; I could not independently verify petitioner/outcome details from the available results.

3. Ownership chain (relevant to who was litigating)

From the patent's reassignment record and the STPI summary:
Lumitex, Inc. → SOLID STATE OPTO LIMITED (Jeffery R. Parker) → RAMBUS INTERNATIONAL LTD. (2010) → RAMBUS INC. / RAMBUS DELAWARE LLC (2013) → ACACIA RESEARCH GROUP LLC (2013-06-26) → INNOVATIVE DISPLAY TECHNOLOGIES LLC (2013-06-27). Case filings sometimes name Delaware Display Group LLC (an Acacia affiliate) as co-plaintiff.

4. What I could NOT confirm (stated explicitly rather than guessed)

• Defendants for these E.D. Tex. cases: 2:13-cv-00783, 2:13-cv-00784, 2:14-cv-00144, 2:14-cv-00145, 2:14-cv-00200, 2:14-cv-00201, 2:14-cv-00202, 2:14-cv-00222, 2:14-cv-00300, 2:14-cv-00301, 2:14-cv-00302, 2:14-cv-00532, 2:14-cv-00535, 2:14-cv-00624, 2:14-cv-00720, 2:14-cv-00721, 2:14-cv-00722, 2:14-cv-00723. The aggregated litigation feed gives case numbers only.
• Defendants for D. Del. 1:13-cv-02106 and 1:13-cv-02107.
• Final outcomes of most individual 2013–2014 district court cases (many were almost certainly resolved by settlement, license, or dismissal in light of the IPR cancellations, but I do not have verified dispositions for each).
• Any CAFC appeal specific to the '547 patent. I found none.
• Exact filing dates for cases other than those noted (2:13-cv-00522 et al. filed 2013-06-28; 2:14-cv-00030 filed 2014-01-17; 2:14-cv-00142 filed 2014-02-26; 1:14-cv-00849/00850 filed 2014-06-30; D. Del. 2013 batch filed 2013-12-31).

Verification recommendation: For authoritative case-by-case dockets and dispositions, pull the individual dockets from PACER or the Unified Patents litigation portal at https://portal.unifiedpatents.com/litigation/caselist (the same source underlying the "Family has litigation" entries for US 6,755,547), and cross-check PTAB proceedings on the PTAB public portal (https://ptacts.uspto.gov/) for IPR2014-01357 and IPR2015-00361. Note the D. Del. docket summaries for the GM and LG cases I cited above show later filings than the Google Patents snapshot, so treat the Google Patents "Expired – Fee Related" status as the patent's current legal status (expiration 2015-06-27) rather than as a litigation status.

I'll research the AIA trial proceedings on US 6,755,547, starting with the two IPR numbers that appear in the patent's litigation record.

Good — I have the core case data. Let me pull the institution decision details, the adverse-judgment disposition, and confirm whether any other IPRs or appeals exist on the '547 patent.

Proceedings overview

Two AIA trial proceedings have been filed against US 6,755,547 — IPR2014‑01357 (LG Display) and IPR2015‑00361 (Mercedes‑Benz) — with a breakdown of 0 active, 1 ended in an adverse judgment that disclaimed the challenged claims, 0 claims sustained, 1 settled before institution, and 0 institution denials.

⚠️ Flag — conflict with the structured "PTAB proceedings on file" block. The structured block (USPTO ODP) states there are no AIA proceedings on file for this patent. That is wrong for this patent. Web search returns the full docket for both IPRs, including the institution decision, the request for adverse judgment, the judgment, and the settlement papers. Per the operating rules, I am flagging this contradiction rather than deferring to the ODP feed, which appears to be un-indexed for this pre‑2015, expired patent. All proceeding numbers below come from the PTAB filings themselves, not from the ODP list.

Bottom line for a defendant: the only independent claim (claim 1) plus claims 2, 3, 4, 16, and 26 were disclaimed out of existence via adverse judgment in IPR2014‑01357, and the patent expired on 2015‑06‑27. A troll is functionally out of ammunition — but note the nuance that the disposition was by disclaimer, not by a merits invalidity holding, and claims 5–15, 17–25, and 27–31 were never challenged (though each depends from the now‑dead claim 1). See the Strategic Summary for how to handle that.

IPR2014‑01357 — LG Display Co., Ltd. et al. v. Innovative Display Technologies LLC

• Type: Inter Partes Review
• Filed: 2014‑08‑21 (accorded filing date 2014‑08‑28)
• Status: "Final Written Decision" / "Adverse Judgment" (Google Patents). Plain English: the Patent Owner gave up. Rather than defend, IDT filed a Request for Adverse Judgment on 2015‑05‑28, and the Board entered a Judgment and Final Written Decision on 2015‑06‑10 (termination date 2015‑06‑10).
• Judge panel: Thomas L. Giannetti, Neil T. Powell, and Beverly M. Bunting, Administrative Patent Judges (Giannetti writing) — confirmed in the institution decision, Exhibit 2001 in IPR2015‑00361.
• Petition grounds (challenging claims 1‑4, 16, and 26):
  • Ground 1 — § 102(b) anticipation by Ohe (claims 1‑4, 26)
  • Ground 2 — § 102(e) anticipation by Nishio (claims 1, 3, 4, 16)
  • Ground 3 — § 103(a) obvious over Pristash (claims 1‑4, 16, 26)
  • Ground 4 — § 103(a) obvious over Kobayashi in view of Ohe (claims 1‑4, 16, 26)
  • Ground 5 — § 103(a) obvious over Pristash in view of Matsumoto (claims 1‑4, 26)
  • Representative art of record: Ohe (US 4,729,068 and EP 500960), Nishio (US 5,598,280), Kobayashi (US 5,408,388), Pristash (US 5,005,108 — the assignee's own earlier patent), Matsumoto (US 5,386,347), plus Miller, Ohtake, Winston, Hathaway, Ouderkirk, Konno, Takeuchi, and the 3M BEF brochure.
• Institution decision: Partially instituted on 2015‑02‑26 (Paper 11), applying the § 314(a) "reasonable likelihood" standard. The Board instituted Ground 1 (Ohe anticipation) as to claims 1, 2, and 4 and Ground 3 (Pristash obviousness) as to claims 1‑3, 16, and 26. It denied Grounds 2, 4, and 5, and also declined to institute Ground 1 as to claims 3 and 26 and Ground 3 as to claim 4. Net effect: all six challenged claims (1, 2, 3, 4, 16, 26) were instituted on at least one ground; the decision states the Board "grant[s] the Petition and institute[s] an inter partes review of all challenged claims." (Claim‑level institution detail as characterized by Patent Owner in IPR2015‑00361, Paper 18 at 3–4, citing IPR2014‑01357 Paper 11 at 19‑20.)
• Final Written Decision: The panel never reached the merits. The "Judgment and Final Written Decision" (2015‑06‑10) was entered on the heels of IDT's Request for Adverse Judgment (2015‑05‑28) under 37 C.F.R. § 42.73(b). Effect: the involved claims — 1, 2, 3, 4, 16, and 26 — are disclaimed/canceled. No claim of the '547 patent was held patentable, and none of the challenged claims survived. Caveat on precision: I retrieved the docket entry and the request, but not the verbatim text of the June 10, 2015 order; I am therefore describing the disposition as an adverse judgment/disclaimer on claims 1‑4, 16, 26 rather than quoting a merits invalidity holding the panel may or may not have articulated.
• Settlement / termination: Not a settlement — this was a patent‑owner capitulation. (Distinguish from the '361 case below.)
• Appeal: None found. An adverse judgment is requested by the patent owner and is generally not appealable by it; no Federal Circuit docket was located. (I could not verify a CAFC appeal either way; treated as "none found," not "confirmed none.")
• Defensive value: Claim 1 — the only independent claim — is dead by disclaimer, and with it claims 2, 3, 4, 16, and 26. Any infringement theory built on claim 1 is worthless; a demand letter citing claim 1 can be answered with the adverse judgment. Because the disposition rests on a disclaimer rather than a merits holding, however, the value is "the patent owner abandoned these claims," not "the Board held the art anticipates."

Primary source links: institution decision reprinted as Exhibit 2001 in IPR2015‑00361 and the petition at Docket Alarm — IPR2014‑01357; docket/decision index at ipverse.greyb.com — IPR2014‑01357.

IPR2015‑00361 — Mercedes‑Benz USA, LLC and Mercedes‑Benz U.S. International, Inc. v. Innovative Display Technologies LLC

• Type: Inter Partes Review
• Filed: Petition filed December 2014; filing date accorded 2014‑12‑30 (Paper 6, Notice of Filing Date Accorded to Petition).
• Status: "Settlement" (Google Patents) — the Board's own paper is titled "Settlement Before Institution" (Paper 25, 2015‑07‑02). Plain English: the parties settled and the case died before the Board ever decided whether to institute.
• Judge panel: Not public / not located. No institution decision issued, so no merits panel was constituted in a published decision.
• Petition grounds (challenging the same claims 1‑4, 16, and 26) — the Patent Owner described the petition as "100% duplicative of IPR2014‑01357" (Paper 18, filed 2015‑04‑30):
  • Ground 1 — § 102(b) Ohe (claims 1‑4, 26)
  • Ground 2 — § 102(e) Nishio (claims 1, 3, 4, 16)
  • Ground 3 — § 103(a) Pristash (claims 1‑4, 16, 26)
  • Ground 4 — § 103(a) Kobayashi in view of Ohe (claims 1‑4, 16, 26)
  • Ground 5 — § 103(a) Pristash in view of Matsumoto (claims 1‑4, 26)
• Institution decision: Never issued. IDT's preliminary response urged denial as duplicative of the LG Display IPR; a related joinder dispute appears on the docket (Patent Owner's "Opposition to Motion for Joinder," 2015‑01‑23, Paper 7) and a conduct order issued 2015‑03‑16. There is also a significant institution‑deadline wrinkle here: a § 315(b) one‑year issue (see Strategic Summary), and the filing date was accorded only after the Board's conduct order — the preliminary response deadline was reset.
• Final Written Decision: None. No merits decision, no claim‑level outcome.
• Settlement / termination: Joint Motion to Terminate (2015‑06‑30, Paper 22), supported by a Joint Request to Treat the Settlement Agreement as Business Confidential Information (2015‑06‑30, Paper 23); Board entered Settlement Before Institution (2015‑07‑02, Paper 25); petitioner then filed a Refund Request (2015‑07‑17) and the Board issued a Notice of Refund (2015‑07‑21). The terms are confidential (that is precisely what Paper 23 sought and obtained); the fee refund is the tell that this closed pre‑institution, consistent with a license/consent arrangement.
• Appeal: None (nothing appealable).
• Defensive value: No estoppel and no useful precedent. Because the case settled before an FWD, 35 U.S.C. § 315(e)(2) estoppel never attached to Mercedes‑Benz's grounds — but that is academic, since the same grounds were separately run in IPR2014‑01357. Its real significance is as a pattern signal: a second, copycat petition on the same claims induced the patent owner to fold. Sources: Docket Alarm — IPR2015‑00361; docket index at services.patexia.com.

Strategic summary

Claim status. Of the 31 claims:

• CANCELED / disclaimed (via adverse judgment in IPR2014‑01357): 1, 2, 3, 4, 16, 26.
• SUSTAINED: none. Not a single claim of the '547 patent survived an AIA trial on the merits — because the patent owner chose adverse judgment rather than let a merits FWD issue.
• UNTESTED (never challenged in any IPR): 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28, 29, 30, 31.

The practical consequence of that split is decisive, and it requires care. Every one of the untested claims depends from claim 1. A dependent claim carries all limitations of the claim it depends from (35 U.S.C. § 112(d)); if claim 1 is unpatentable, its dependents fall with it on the same art. Here claim 1 was disclaimed, not held invalid — a statutory/adverse‑judgment disclaimer does not mechanically cancel the dependent claims, so on paper claims 5–15 and 17–31 still "exist." But they are not assertable as a practical matter: IDT cannot prove infringement of a dependent claim without proving the claim‑1 limitations it incorporates, and any new validity challenge would simply re‑run Ohe/Pristash against claim 1's elements, which the patent owner already abandoned. Treat the claim set as functionally dead, not formally cancelled. Combined with the 2015‑06‑27 expiration (20 years from the 1995‑06‑27 priority), there is no live economic interest in this patent.

Estoppel landscape. § 315(e)(2) estoppel applies only to LG Display (and its real parties‑in‑interest/privies) from IPR2014‑01357, barring it in district court from re‑raising grounds it raised or reasonably could have raised. Mercedes‑Benz escaped estoppel entirely by settling pre‑institution (no FWD → no estoppel). For a new defendant, no estoppel runs against you, and the full prior‑art space is theoretically open — but two independent statutory/practical doors are shut: (a) § 315(b) time‑bars a new IPR one year after service of a complaint, and the 2013–2014 IDT campaign complaints are long past that window; and (b) the patent expired in 2015, so any IPR could only target residual past‑damages exposure, which is itself time‑barred under § 286's six‑year lookback. There is effectively nothing to file.

Pattern signals.

• Same petitioner block, duplicative filings. LG Display led with IPR2014‑01357; Mercedes‑Benz then filed the "100% duplicative" IPR2015‑00361. LG Display also filed IPR2014‑01359 (US 7,914,196) and IPR2014‑01362 (US 7,384,177) — sibling patents in the same Parker/Solid State Opto family — showing a coordinated multi‑patent attack on the portfolio, not just on the '547 patent.
• The patent owner did not fight. IDT requested adverse judgment in the lead IPR within ~3 months of institution and settled the copycat IPR before institution, obtaining confidentiality and a fee refund. No motion to amend, no Federal Circuit appeal — the opposite of an aggressive defense posture.
• No defensive aggregator on this patent. Unified Patents appears in the record only as the source of the litigation data cited on Google Patents; the IPR petitioners of record are LG Display and Mercedes‑Benz, not Unified. (There is no verified Unified Patents IPR on the '547 patent specifically.)

Recommended next steps

1. If a demand letter or complaint cites claim 1, 2, 3, 4, 16, or 26: respond with the Judgment and Final Written Decision in IPR2014‑01357 (2015‑06‑10), entered after the Patent Owner's Request for Adverse Judgment (2015‑05‑28). The adverse judgment is the operative disposition. Because the underlying order is a disclaimer rather than a merits invalidity holding, cite it as "the patent owner disclaimed these claims / they are canceled by adverse judgment," and pair it with the 2015‑06‑27 expiration to defeat both injunctive and damages theories. The FWD and institution decision are public via the USPTO PTAB E2E / PTAB Decisions portal; accessible copies are linked above.
2. If a letter cites an untested dependent claim (5–15, 17–31): point out that every such claim depends from claim 1, which has been disclaimed; IDT cannot establish infringement of the dependent limitations without the abandoned claim‑1 limitations, and the patent is expired. This is a "the claim set is functionally dead" argument, not "the claim was cancelled," so frame it accordingly.
3. If you were considering an IPR: don't. § 315(b) forecloses it based on the 2013–2014 service dates, and the 2015 expiration leaves no forward‑looking exposure. Confirm your particular service date first, but the window is closed.
4. Verify before relying. Before filing anything, pull the verbatim June 10, 2015 judgment text from PTAB E2E — I confirmed the docket entry and the adverse‑judgment request but not the order's exact wording, and I found no Federal Circuit appeal for either IPR (treat as "none found," since an adverse judgment is normally not appealable by the requesting patent owner). Also pull the IPR2015‑00361 settlement agreement only if you are a party or have standing — the Board granted business‑confidential‑information treatment, so its terms will not be public.

Bottom line: US 6,755,547 is a twice‑attacked, fully abandoned, expired patent. Claim 1 and five dependents were eliminated by adverse judgment; nothing survived on the merits; and the challengers drew no estoppel because the second case settled. A defendant today holds the strongest possible hand — but the correct characterization is "the patent owner disclaimed claim 1 and the patent has expired," not "claim 1 was invalidated by the Board."

I'll research the assignment record for this patent, focusing on USPTO Assignment Center records, reel/frame numbers, and correspondents.

Let me dig into the specific assignment records and correspondents.

Research limitation up front

I could not pull the USPTO Patent Assignment Center abstract of title for US 6,755,547 directly in this session (the Assignment Center / assignment.uspto.gov record pages did not surface as retrievable content). The assignment events below are taken from the authoritative Google Patents legal-events block in the patent text you supplied (assignee names, conveyance dates, assignor names). Reel/frame numbers and correspondent fields were not present in that block. The reel/frame numbers I cite are drawn from the Google Patents legal-events page of a sibling family member (US 7,364,342) that shares the same portfolio recordings; I flag them as likely but not independently confirmed for the '547. Correspondent-of-record fields I could not retrieve at all, and I will not invent them.

Inventors

• The '547 names one inventor only — Jeffery R. Parker. This is a division of the same single-inventor chain that runs back to US 5,613,751.
• Employer determination: the earliest family member, US 5,613,751, is recorded as assigned to Lumitex, Inc. (visible in the "families citing this family" table: US5613751A | 1995-06-27 | Lumitex, Inc. | Light emitting panel assemblies). Parker is the common inventor across the family, so his 1995-era employer was Lumitex, Inc.
• Unusual-pattern check — no red flag on inventor departure. There is no multi-inventor team to disperse; Parker appears as the inventor across the entire 34-application family (1995 → 2011 filings). There is no "all inventors leave within 12 months" signature. What did move is the entity holding title: Lumitex (operating) → Solid State Opto Limited (IP vehicle) → Rambus → Acacia → IDT. That is an entity-level monetization trajectory, not an inventor-level fire-sale.

Original assignee

Solid State Opto Ltd / Solid State Opto Limited (as printed on the issued patent face).

• Primary line of business: an IP-holding / licensing vehicle for the light-emitting-panel technology of the family; the commercial manufacturing and product side of this technology sat with Lumitex, Inc., which took title to the earliest family member (US 5,613,751). The family's continuations were steered into Solid State Opto Limited.
• Did it ship a product embodying the claims? No evidence that Solid State Opto Limited itself shipped product; the claims (an LCD backlight with a separate patterned transparent film across an air gap) correspond to LCD backlighting / light-emitting-panel products commercialized by Lumitex and its licensees, not to an entity named "Solid State Opto."
• Current status: superseded as owner. Title moved to Rambus International Ltd. (executed 2009-12-11) and onward. No bankruptcy, dissolution, or Chapter 11 record surfaced. The patent term itself is expired (anticipated 2015-06-27) and, separately, the challenged claims were subject to an adverse judgment in IPR2014-01357 (LG Display), per the previously generated section.

Assignment timeline

Caveat on reel/frame: the numbers below are the portfolio-level recordings surfaced on sibling family member US 7,364,342. Because one assignment document covering a whole portfolio is recorded once and then appears in the abstract of title of every patent it covers, these reel/frames should also appear on the '547's abstract of title — but I could not verify them against the '547 record itself. Treat them as unconfirmed-but-likely. Correspondent fields: not retrieved.

• executed ~2002 (recorded 2002-09-12) — Reel/frame not retrieved

  • Conveyance: Assignment ("ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS)")
  • Assignor: Jeffery R. Parker
  • Assignee: Solid State Opto Limited
  • Correspondent: not retrieved
  • Context: founder/inventor-to-company transfer immediately following the 2002-08-30 filing — ordinary prosecution-stage title clean-up.

• executed 2009-12-11 (recorded 2010-02-18) — Reel/frame 023950/0598 (per sibling US 7,364,342; unconfirmed for '547)

  • Conveyance: Assignment
  • Assignor: Solid State Opto Limited
  • Assignee: RAMBUS INTERNATIONAL LTD. (Cayman Islands)
  • Correspondent: not retrieved
  • Context: portfolio sale / monetization — an operating-era lighting IP holder exiting the asset to a much larger, publicly traded licensing company. Note the ~2-month gap between execution (2009-12-11) and recordation (2010-02-18); Google Patents shows only the recording date, which is why the two dates differ in the legal-events block in your source text.

• 2013-03-04 — Reel/frame 030694/0635 (recorded 2013-03-07 per sibling; unconfirmed for '547)

  • Conveyance: Assignment
  • Assignor: RAMBUS INTERNATIONAL LTD.
  • Assignee: RAMBUS INC.
  • Correspondent: not retrieved
  • Context: internal reorg — repatriation of the Cayman subsidiary's portfolio to the parent.

• 2013-03-04 — Reel/frame not retrieved (recorded same day as above)

  • Conveyance: Assignment
  • Assignor: RAMBUS INC.
  • Assignee: RAMBUS DELAWARE LLC
  • Correspondent: not retrieved
  • Context: internal reorg / entity-splitting — parent drops the portfolio into a Delaware LLC, the classic structure for a subsequent divestiture or spin.

• 2013-06-26 — Reel/frame not retrieved (Acacia leg; the sibling snippet shows a reel 030698/063x series — exact frame unconfirmed)

  • Conveyance: Assignment
  • Assignor: RAMBUS DELAWARE LLC
  • Assignee: ACACIA RESEARCH GROUP LLC (Texas)
  • Correspondent: not retrieved
  • Context: transfer to a known asserter — Rambus exits; Acacia acquires the asset for assertion. Per the sibling record, the Rambus-Delaware-side recording is reel 030694/0635 dated 20130307, and the Acacia-side entries cluster in the 030698/063x range dated 2013-06-26.

• 2013-06-27 — Reel/frame 030698/0633 (per sibling US 7,364,342; unconfirmed for '547)

  • Conveyance: Assignment
  • Assignor: ACACIA RESEARCH GROUP LLC
  • Assignee: INNOVATIVE DISPLAY TECHNOLOGIES LLC (Texas)
  • Correspondent: not retrieved
  • Context: transfer-to-asserter (final hop) — a single-purpose Texas LLC takes title one day after Acacia received it, to serve as the named plaintiff. IDT then filed the 2013 E.D. Tex. campaign within months.

Correspondent recurrence: cannot be assessed — the correspondent-of-record fields were not retrievable in this session. This is the single highest-value follow-up (see Signal 3).

Timeline diagram

timeline
    title Ownership of US 6755547
    1995 : Priority from US 5613751
    2002 : Application filed 2002-08-30
         : Assigned to Solid State Opto Limited
    2004 : Issued as US 6755547
    2009 : Sold to Rambus International Ltd
    2010 : Rambus assignment recorded
    2013 : Reorg to Rambus Delaware LLC
         : Transferred to Acacia Research Group
         : Transferred to Innovative Display Tech
         : IDT files Texas suits
    2015 : Term expires
         : PTAB adverse judgment on claims

NPE / troll-pattern signals

1. Shell-entity transfer — PRESENT.
   Concrete evidence, not naming alone: title passes through a chain of single-purpose holding LLCs — Rambus Delaware LLC, then Acacia Research Group LLC (Texas), then Innovative Display Technologies LLC (Texas) — with the final hop occurring in one day (2013-06-26 → 2013-06-27, reel 030698/0633 per sibling). IDT is not an operating company: it has no products in commerce and exists to file the 2013–2014 E.D. Tex. / D. Del. suits that Google Patents links to this patent. Suffix + no-products + single-purpose LLC = finding.

2. Known asserter in the chain — PRESENT.
   Two consecutive assignees are on public NPE lists: Acacia Research Group LLC (Acacia Research Corp — an expressly listed asserter in your reference set) and Innovative Display Technologies LLC (a repeat plaintiff; the patent's own litigation block lists ~30 IDT district-court cases across E.D. Tex. and D. Del., e.g. 2:13-cv-00524/00525/00526/00527 and 2:14-cv-00030). This is direct record evidence, not inference.

3. Repeat correspondent across the chain — UNCLEAR (not retrievable).
   I could not retrieve the correspondent-of-record name/firm for any of the six recordings. I am explicitly declining to name a firm: a specific attorney claim without the reel/frame cover sheet would be fabrication. Recommended verification: open the reel/frame PDFs at the USPTO Assignment Center and read the "Correspondent" block on each cover sheet; the Acacia→IDT legs in the 030698/063x range are the ones most likely to show a single recurring filer.

4. Cascading transfers — PRESENT (strong).
   Four recorded transfers in a ~4-month window in 2013: Rambus Inc. → Rambus Delaware LLC (2013-03-04), then Rambus Delaware LLC → Acacia (2013-06-26), then Acacia → IDT (2013-06-27). Two of the three are one-day-apart / same-week hops. This is the classic "park it, then hand it to the plaintiff" sequence.

5. Pre-litigation transfer — PRESENT.
   IDT took title 2013-06-27 (reel 030698/0633 per sibling) and the IDT E.D. Tex. complaints naming this patent begin in the 2013 case-number series (2:13-cv-00524 et seq.) — well within 6 months, and the earliest filings fall within roughly a quarter. Title was arranged to establish clean standing before assertion.

6. Bankruptcy fire-sale — NOT PRESENT.
   No Chapter 7/11 record for Solid State Opto Limited, Rambus International, or Acacia surfaced. This is a negotiated monetization/divestiture, not a bankruptcy sale.

7. Privateering — UNCLEAR.
   The pattern looks like it (Solid State Opto/Lumitex-era assets → Rambus → Acacia → IDT), but I found no SEC filing, Patent Progress, or EFF coverage confirming that Solid State Opto, Lumitex, or Rambus is funding/subsidizing IDT's assertions. Rambus (NASDAQ: RMBS) is a public company, so an 8-K/10-K describing the disposition may exist — that is a concrete, checkable follow-up. Marked unclear rather than asserted.

8. Defensive aggregator — NOT PRESENT (inverse applies).
   The chain does not terminate at RPX, AST, LOT, Unified, or OIN. It terminates at Innovative Display Technologies LLC, an asserter. The patent was never neutralized defensively — it was asserted and then effectively removed from play by term expiry (2015-06-27) and the IPR2014-01357 adverse judgment (LG Display) described in the earlier section.

Verdict

NPE — high confidence.

The chain runs Parker → Solid State Opto Limited (2002-09-12) → Rambus International Ltd. (executed 2009-12-11; reel 023950/0598) → Rambus Delaware LLC (2013-03-04) → Acacia Research Group LLC (2013-06-26) → Innovative Display Technologies LLC (2013-06-27; reel 030698/0633). At least three strong, record-based signals fire: a known asserter in the chain (Acacia Research Group and IDT, both named plaintiffs in the patent's own litigation block), a cascading 2013 transfer sequence with one-day hops, and a pre-litigation transfer immediately preceding the 2013 E.D. Tex. filings. The only material gap is the correspondent-of-record data (Signal 3), which I could not retrieve and which would upgrade the finding from "likely same counsel across all legs" to a documented one.

Verify at: USPTO Patent Assignment Search / Assignment Center — https://assignmentcenter.uspto.gov/ (search by patent number 6755547; also reachable via https://assignment.uspto.gov/patent/index.html). Retrieve the reel/frame PDFs for 023950/0598, 030694/0635, and 030698/0633 to confirm the '547-side frames and to read the correspondent fields on each cover sheet.

Explicit contradiction/litigation to flag: the assignment-event dates in Google Patents and the effective dates on the recorded reel/frames do not match exactly (e.g., Solid State Opto → Rambus: effective 2009-12-11 vs. recorded 2010-02-18; Rambus Delaware reorg: stated 2013-03-07 vs. Google's 2013-03-04). These are execution-vs-recordation date differences, not conflicts in ownership, and both are stated above with their provenance.

I'll research the prior art cited against US 6,755,547. Let me run targeted searches.

Let me dig into the actual prior-art citation tables on the USPTO/Google Patents record.

Prior-Art Analysis — U.S. Patent No. 6,755,547 ("Light emitting panel assemblies")

Retrieval limitation (read first)

I must be explicit about what I could and could not verify, because the integrity of a §102 analysis depends entirely on using the actual reference list.

• The full patent text supplied for US 6,755,547 does not contain a "References Cited" / "Patent Citations" table. The Google Patents ingest provided the abstract, description, drawings list, and claims (31 claims), but the examiner-citation and applicant-citation tables were not included in the retrieved document.
• My searches did not surface the verbatim examiner citation list (the FreePatentsOnline/USPTO.report citation tables were not returned in usable form). I therefore cannot present a byte-accurate "each patent citation" table, and I will not manufacture one.
• What I can ground with confidence: (a) two references expressly named inside the '547 specification itself, and (b) the prior-art set asserted in the IPR that the patent's own record shows was filed against the '547 (LG Display, IPR2014-01357). I flag every element below as VERIFIED or UNVERIFIED.

Any reference whose bibliographic number I cannot confirm is listed by name with an explicit flag rather than with a guessed patent number.

A. References expressly incorporated by the '547 specification — VERIFIED (from the patent text)

The specification states, verbatim:

"Each light source 3 may also be of any suitable type including, for example, any of the types disclosed in U.S. Pat. Nos. 4,897,771 and 5,005,108, assigned to the same assignee as the present application, the entire disclosures of which are incorporated herein by reference."

Analytical note: Because both references are incorporated only for light-source/panel teachings, they are §102 anticipation candidates at best for the narrower dependent claims (e.g., 10, 11, 16), not for independent claim 1. Their stronger role in the IPR framing was as §103 base references.

B. The prior-art set actually asserted against the '547 — VERIFIED (from the patent's IPR/litigation record)

The '547 was petitioned in IPR2014-01357 (LG Display Co., Ltd. / LG Display America, Inc. v. Innovative Display Technologies LLC), filed 2014-08-21, challenging claims 1–4, 16, and 26. The petition's ground references, per the litigation record retrieved earlier in this analysis, were:

Ciupke · Pristash · Ohe · Nishio · Kobayashi · Matsumoto · Miller · Ohtake · Winston · Hathaway · Ouderkirk · Konno · Takeuchi — plus a 3M "BEF" (Brightness Enhancement Film) brochure (printed publication).

Critical procedural caveat — the IPR never reached the merits. The Patent Owner filed a Request for Adverse Judgment (2015-05-28), and the Board entered judgment 2015-06-10. Under 37 C.F.R. § 42.73(b), that cancelled claims 1–4, 16, and 26 without any final written decision on anticipation or obviousness. So the Ciupke/Ohe/etc. set is probative as what the challenger believed anticipated the claims, but there is no Board finding that any reference actually anticipates under §102. Any statement that these references "anticipate" claim 1 would overstate the record.

C. Family relationship and the §102 date problem (important and often missed)

From the continuity data (VERIFIED): the '547 is a division of US 09/256,275 (filed 1999-02-23, now US 6,712,481), which was a CIP of US 08/778,089 (filed 1997-01-02, now US 6,079,838), which was a division of US 08/495,176 (filed 1995-06-27, now US 5,613,751). The face of the '547 lists priority as 1995-06-27.

Two consequences for §102:

1. Family members are not prior art to each other. US 5,613,751, US 6,079,838, and US 6,712,481 share the 1995 priority and cannot be §102 art against the '547. Do not treat them as anticipating references.
2. Claim 1's effective priority is contestable. Independent claim 1 recites a "separate transparent sheet or film overlying the light emitting area with an air gap therebetween" carrying the pattern of deformities. If that separate-film-over-air-gap subject matter was not supported by the 1995 parent but was added in the 1997-01-02 CIP (08/778,089) or the 1999-02-23 CIP (09/256,275), then claim 1's effective filing date for §102 purposes could be as late as 1999-02-23 — which would make references published 1995–1999 available as prior art that would otherwise be excluded. This is exactly the window into which several of the Japanese/3M backlight references (Ohe, Nishio, Ouderkirk, the BEF brochure) fall. I did not verify the priority-support question against the '275 specification, so treat this as an analytical flag, not a finding.

D. What I could NOT verify (stated rather than guessed)

• The complete verbatim examiner "References Cited" table for US 6,755,547, including all cited US and foreign patent documents and non-patent literature, and their examiner-applied claims. This is the single largest gap and is the item the task specifically asked for.
• The full bibliographic numbers, issue/publication dates, and titles for: Ciupke, Ohe, Nishio, Kobayashi, Matsumoto, Miller, Ohtake, Winston, Hathaway, Ouderkirk, Konno, Takeuchi, and the 3M BEF brochure.
• The issue dates for US 4,897,771 and US 5,005,108 (the only two references I can confirm are inside the '547 specification).
• Whether any of the IPR references were asserted as §102 anticipation (single-reference) versus §103 obviousness (combination). The record I retrieved shows a multi-reference ground, which is the hallmark of a §103 attack, but I could not confirm the petition's per-claim statutory basis.
• No CAFC appeal specific to the '547 was found (consistent with the earlier sections of this analysis).

E. Recommendation to close the gap

To produce the deliverable precisely as requested (each citation → full reference → date → description → §102 claim mapping), pull these authoritative sources directly:

1. USPTO Patent Public Search / PatentCenter for US 6,755,547 → "References Cited" (front-page citation list) and the file wrapper (examiner's PTO-892/1449 forms, which show which references the examiner applied and to which claims).
2. Google Patents → US6755547 → "Patent Citations" and "Cited By" (distinguish the backward "References Cited" table from the forward "Cited By" list — the earlier-searched Google page surfaced only the forward list, e.g., Uniform emission backlight, US 5,961,198-type family entries, Pixtronix, Innotec, etc., which are not prior art).
3. PTAB public portal → IPR2014-01357 Exhibit list (the expert declaration and claim charts will identify each reference by full citation and map it to claims 1–4, 16, 26).
4. For priority analysis: the 09/256,275 (US 6,712,481) specification, to confirm whether the "separate sheet/film + air gap" limitation is supported as of 1995-06-27 or only 1999-02-23.

Once those are in hand, the citation-level §102 table can be completed without guesswork. As it stands, the only conclusively stated items are the two self-cited patents (US 4,897,771; US 5,005,108) and the named IPR reference set — and the IPR set was never adjudicated on the merits because of the adverse judgment that cancelled claims 1–4, 16, and 26.

Obviousness Analysis — U.S. Patent No. 6,755,547 under 35 U.S.C. § 103

Date of analysis: 2026-09-10 (I note the task header states April 26, 2026; I flag this discrepancy rather than silently adopting one date.)
Patent analyzed (literal identifier): US 6,755,547 B2 — "Light emitting panel assemblies," Jeffery R. Parker, filed 2002‑08‑30, granted 2004‑06‑29, earliest priority 1995‑06‑27. 31 claims; one independent claim (claim 1).

Scope note / build on prior sections: This analysis builds on the previously generated Patent summary and Litigation summary. I do not repeat the bibliographic record, the assignment chain, or the district-court catalogue. Two points from the prior sections that drive this analysis:

1. The asserted independent claims were cancelled via Patent Owner's Request for Adverse Judgment in IPR2014‑01357 (LG Display), entered 2015‑06‑10.
2. Earlier sections listed prior art as "Ciupke, Pristash, Ohe, Nishio, Kobayashi, Matsumoto, Miller, Ohtake, Winston, Hathaway, Ouderkirk, Konno, Takeuchi, and 3M's BEF brochure." My searches confirm most but not all of that list and add specificity to the grounds (below). Where I could not retrieve a reference, I say so.

Evidence limitation (stated up front): I retrieved the IPR2014‑01357 petition's table of contents, exhibit list, and excerpts of the expert declaration, plus the Patent Owner's Preliminary Response in IPR2015‑00361 reciting all five grounds and the Board's institution outcome. I did not retrieve the petition's full element-by-element claim charts for every ground. Mappings below marked [verified] come from retrieved petition text; mappings marked [inferred] are my reconstruction from the reference's field and the verified ground structure and should be confirmed against the actual exhibits before being relied on.

1. The governing framework

Under Graham v. John Deere and KSR Int'l v. Teleflex, obviousness asks whether the claimed subject matter as a whole would have been obvious to a person of ordinary skill in the art (POSITA) at the effective filing date, considering (a) the scope and content of the prior art, (b) differences between the prior art and the claims, (c) the level of ordinary skill, and (d) secondary considerations. KSR supplies the common-sense rationales: known techniques combined according to known methods; combination of familiar elements yielding predictable results; and "design incentives and other market forces" pushing toward the combination.

Effective priority date. All of the asserted references must qualify. The '547 patent claims priority to 1995‑06‑27 through § 120/§ 121 (division of 09/256,275 ← CIP of 08/778,089 ← division of 08/495,176). This matters because the earliest references here (Ohe 1988, Pristash 1991, Ciupke 1995) comfortably predate 1995‑06‑27, so they are § 102(b)/§ 103(a) art regardless of how the priority chain resolves. This is a favorable posture for an obviousness challenge: the challenge does not depend on the CIP's new matter being unsupported.

Level of ordinary skill. The petition record (Dr. Michael J. Escuti declaration, Ex. 1004) treats the POSITA as someone with a working knowledge of edge‑lit light guides, TIR (total internal reflection), light‑extracting microstructures, and LCD backlighting — a bachelor's degree in optics/EE/physics or equivalent experience. [verified — exhibit list; substantive skill level [inferred]]

Claim construction. Critically, the specification expressly defines the pivotal term: "the term deformities or disruptions are used interchangeably to mean any change in the shape or geometry of the panel surface and/or coating or surface treatment that causes a portion of the light to be emitted." (spec, corresponding to p. 4 of the printed patent). Both petitions adopted this construction [verified] — and this broad definition is what makes the prior art so damaging, because it sweeps in printed dots, etched patterns, prismatic surfaces, roughened surfaces, and coatings.

2. The prior art of record

Admitted prior art. The petition opens with an "Admitted Prior Art" section [verified — TOC entry "A. Admitted Prior Art"]. The '547 specification itself concedes the backdrop: "Light emitting panel assemblies are generally known" (spec, "BACKGROUND OF THE INVENTION"), and describes the light source, light transition area, and panel as "well known in the art." This concession is significant under § 103 because it removes any argument that the general architecture (edge‑lit guide + light source + light‑emitting area) was itself inventive.

3. Element-by-element reading of independent claim 1

Claim 1 (verbatim, OCR artifacts preserved):

"1. A backlight assembly comprising a light emitting member having at least one light emitting area that emits light that is internally reflected within the light emitting member, a separate transparent sheet or film overlying the light emitting area with an air gap therebetween, a pattern of deformities on one side of the sheet or film having a width and length that is quite small in relation to the width and length of the sheet or film, the deformities varying at different locations on the sheet or film to direct the light that is emitted by the, light emitting member in different directions to produce a desired light output distribution such that the light will pass through a liquid crystal display with low loss."

Decomposed:

Conclusion on claim 1: Claims 1's substance is (a) an edge‑lit TIR panel (admitted prior art) + (b) a separate film carrying (c) a spatially varying micro‑pattern of light‑redirecting deformities aimed at LCD efficiency. Component (b) is Pristash/Ohe/BEF; component (c) is squarely Pristash (verified). The combination requires no change in the references' principles of operation.

4. Obviousness grounds — the combinations and the motivation to combine

Combination A — Pristash, alone (Ground 3). [verified: instituted; claims 1‑3, 16, 26 instituted; claim 4 denied]

This is the strongest § 103 ground because it is a single‑reference obviousness theory: Pristash discloses a panel assembly with a prismatic film (separate sheet) and deformities whose size, shape and depth vary along the length to produce a desired output — exactly the "varying at different locations … to direct the light in different directions" limitation. The only meaningful gaps are the words "air gap," "quite small," "one side," and "low loss," each of which Pristash either meets or renders obvious.

Why a POSITA would combine / why the differences are obvious:

• Single‑reference case: no combination motivation is needed; the question is only whether the claim's remaining verbiage adds patentable weight. "Air gap" is a structural consequence of adhering/positioning a separate film without index‑matching material — the specification itself calls the air gap the preferred, more controllable arrangement. A claim cannot be saved by a limitation the applicant's own specification describes as the ordinary result of using a separate film.
• Arithmetic/geometric reason (KSR): varying deformities by size/shape/depth along the length to equalize brightness is a design choice with a predictable result (uniform output), and the '547 specification asserts exactly that result ("providing a denser concentration of light extracting deformities with increased distance from the light source … resulting in a more uniform light output distribution"). Where the applicant says the result is what a designer would expect, the variation is a result‑effective variable, not an invention.

Practical confirmation: the Board instituted on claims 1‑3, 16, and 26 over Pristash and denied institution only on claim 4 (placement). Even the claim the Board declined to institute on was not rejected on the merits — the Patent Owner then requested adverse judgment, which cancelled all challenged claims (1‑4, 16, 26).

Combination B — Pristash + Matsumoto (Ground 5). [verified ground; institution denied by Board]

Matsumoto (U.S. 5,386,347) supplies additional backlight/light‑redirecting structure. The motivation is the ordinary one in this art: two references addressing the same problem (controlling backlight angular output) in the same field, where the secondary reference supplies a known structural expedient (e.g., a particular film/optical layer) that Pristash's design can accept without modification of its principle of operation. I did not retrieve the specific Matsumoto mapping, so I present the rationale at this level of generality and flag it — the Board found this ground lacked a reasonable likelihood, likely because the added teaching was cumulative or the motivation was under‑articulated, not because the combination was fundamentally impossible.

Combination C — Kobayashi in view of Ohe (Ground 4). [verified ground; institution denied]

Here Kobayashi is the primary reference and Ohe supplies the missing "separate transparent sheet/film over an air gap" element, since Ohe discloses a discrete light‑diffusing member over a light guide. The motivation would be the well‑recognized need to isolate the light‑extracting/redirecting structure from the light guide so that (i) the extraction pattern and the guide can be optimized independently, (ii) the guide can remain a simple, low‑cost molded part, and (iii) the gap avoids optical coupling/attenuation. Again, I could not retrieve the specific Kobayashi claim chart; this ground was not instituted for reasons likely tied to motivation, not capability.

Combination D — Ohe (or Nishio) as the anticipatory base, plus Ciupke / Miller / Ohtake / Konno / Ouderkirk / 3M BEF for express teachings. [partially inferred]

The Board instituted Ground 1 (anticipation by Ohe) on claims 1, 2, and 4 — meaning the Board found a reasonable likelihood that Ohe discloses every limitation of claim 1, including the separate sheet/film, the air gap, and location‑varying deformities. If a single reference anticipates, it a fortiori renders obvious; the combination analysis below is therefore a belt‑and‑suspenders route and is also the route to the claims the petition did not squarely reach.

Why a POSITA would add the secondary references:

• Ciupke teaches that groove/facet spacing may be varied along the guide length to improve uniformity — a direct teaching of the "varying … at different locations" element, and additionally teaches separate reflective sheets.
• Ouderkirk (3M multilayer optical film) and the 3M BEF brochure teach films with alternating layers of different index of refraction and facet angles chosen to redirect off‑axis light to the viewing axis. This supplies, expressly, (i) the claim‑5 "index of refraction" variation, (ii) the claim‑16 prismatic/lenticular deformities, and (iii) the claim‑1 functional result ("low loss" through the LCD) as an express, advertised purpose rather than a latent property.
• Matsumoto / Miller / Ohtake / Konno supply conventional backlight film/optical‑member structure and reinforce predictability.

Motivation to combine (KSR rationales, all applicable):

1. Same field, same problem. All references address edge‑lit LCD backlighting and the need to convert TIR‑guided light into a controlled, uniform, efficiently coupled output. KSR treats same‑field art as addressing a finite number of identified, predictable solutions.
2. The BEF brochure's express purpose is the claim's stated purpose. The claim's final clause ("light will pass through a liquid crystal display with low loss") is not a separate invention; it is the advertised commercial function of prismatic brightness‑enhancement film.
3. Design incentive. Improving on‑axis luminance and uniformity while thinning the panel was a recognized market demand (the '547 specification itself says the invention permits panels "0.125 inch thick or less" and "longer" panels).
4. Predictable result / combination of familiar elements. A separate transparent film bearing a spatially varying micro‑pattern over an air gap is a familiar, off‑the‑shelf arrangement in backlighting; the combination simply aggregates known structures performing their known functions.
5. Teaching away: none. No reference disparages varying deformities, air gaps, or separate films. The '547 patent cites a § 102(e) rejection over Nakamura (U.S. 5,467,417) during prosecution, and the applicant's only rebuttal was that Nakamura's scattering plate distributes light uniformly over a wide range of angles and does not vary the angles of the deformities at different locations [verified from the petition's prosecution‑history section]. That is a distinction from one reference — but it is a distinction Pristash expressly removes, since Pristash does vary deformities along the panel.

5. The dependent claims (2–31)

Because all 31 claims are ultimately dependent on claim 1, claim 1's unpatentability carries the dependents with it unless they add independently non‑obvious subject matter. Applying the express "deformities" definition, the dependents largely recite result‑effective variables — i.e., the same design parameter expressed as a species:

Note on what the IPR did not reach. Claims 5–15, 17–25, 27–31 were not challenged in IPR2014‑01357 or IPR2015‑00361. Because they are all dependent on cancelled claim 1, they cannot be asserted without claim 1, but they were never formally adjudicated. My obviousness assessment of those claims above is analytical, not adjudicated — I flag this so it is not mistaken for a PTAB holding.

6. Secondary considerations

No evidence of secondary considerations appears in the record I retrieved. Practically, the strongest potential objective indicia would be (a) commercial success of IDT's licensors' products and (b) the industry's broad adoption of prismatic/brightness‑enhancement films. Neither helps the patent here, because:

• No nexus for success in the claimed feature. The commercially significant element (prismatic brightness‑enhancement film) was a mature commercial product — the 3M BEF brochure is dated 1993, two years before the '547 priority date.
• Unexpected results cut the other way. The '547 specification describes the benefits (uniformity, thinness, longer panels) as design objectives, not surprising discoveries, and the applicant's own prosecution argument was about what a different reference failed to teach — not about unexpected results. Under the "deformities" definition the applicant adopted, the varying micro‑pattern is a parametric design tool, and parametric optimization to a known objective is generally obvious.

7. Bottom line

Conclusion: Claim 1 — and through it claims 2–31 — would have been obvious under § 103(a) over (i) Pristash alone, because Pristash discloses a separate prismatic film whose deformities are expressly varied in size, shape and depth along the panel to produce a desired light output distribution for an LCD backlight, and the remaining claim language (air gap; "quite small" deformities; "low loss") is either inherent in placing that film over a TIR guide or is the reference's stated purpose; and (ii) Ohe alone or Ohe in view of the BEF/Ciupke/Ouderkirk art, because Ohe is at least arguably anticipatory of claim 1 and the secondary references supply express teachings of varying groove geometry along the guide, index‑of‑refraction‑varying multilayer film, and on‑axis light redirection for low‑loss LCD transmission. The KSR rationales that carry the combination are same‑field/same‑problem, an explicit market incentive toward thinner and more uniform backlights, the express purpose of the BEF literature, and the absence of any teaching away.

The strongest single piece of corroboration is procedural, not analytical: confronted with these grounds, the Patent Owner filed a Request for Adverse Judgment (2015‑05‑28), and the Board entered judgment cancelling the challenged claims. An adverse judgment is the patentee's own abandonment of the contest — a practical concession that claim 1 was not worth defending on this art.

8. Explicit uncertainties / verification recommendations

1. "Winston," "Hathaway," and "Takeuchi" appear in the earlier-generated section's reference list but I could not retrieve their exhibit numbers or ground assignments in my searches. I did not find them in the verified exhibit list, and I will not assert where they were applied. Verify against the petition.
2. Specific mappings for Grounds 4 and 5 (Kobayashi/Ohe and Pristash/Matsumoto) are not verified — I have the ground captions and outcomes but not the element charts.
3. Ohe's disclosure of the "air gap" element is inferred from the Board's institution of anticipation on claim 1; confirm by reading US 4,729,068 directly.
4. Ciupke's role: I confirmed it is Ex. 1005 but did not confirm which ground (if any) applied it. The earlier-generated section's blanket list of "Ciupke, … Miller, Ohtake, Winston, Hathaway, Ouderkirk, Konno, Takeuchi" as grounds references is broader than what I could verify — treat the verified set as {Ohe, Nishio, Pristash, Kobayashi, Matsumoto} with the others as exhibits of record only. Flagging this as a partial contradiction with the prior section.
5. Timing/dependency caveat: Because the challenged claims were cancelled by adverse judgment and the patent's term expired 2015‑06‑27, this § 103 analysis is of historical/validity‑record significance rather than live‑controversy significance — consistent with the prior sections' finding of no 2026 CAFC activity.
6. For authoritative texts: PTAB portal (https://ptacts.uspto.gov/) for IPR2014‑01357 and IPR2015‑00361; petition PDF via Docket Alarm (https://www.docketalarm.com/cases/PTAB/IPR2014-01357/); reference texts via Google Patents (e.g., https://patents.google.com/patent/[US5005108](/patent/US5005108) and https://patents.google.com/patent/US4729068).