US 6566805

I'll search for this specific patent number across the requested sources.

Let me run more targeted searches on USPTO/PatentsView and CAFC-specific sources.

Let me check for any PTAB proceedings or Federal Circuit appeals specific to this patent.

Search caveats up front

I do not have direct authenticated access to USPTO PatentCenter/PAIR or to the Federal Circuit's CM/ECF docket system. What follows draws on (a) the full authoritative patent text retrieved from Google Patents (https://patents.google.com/patent/[US6566805](/patent/US6566805)/en), and (b) open-web docket/aggregator results. Where a source did not confirm something, I say so rather than guess.

Also note: one of my searches returned a docket (E.D. Tex., Headwater Research LLC v. Verizon, USCA No. 26-1884) that contains the string "605" only as a filing-fee amount and case-number fragments. That is not a match for patent 6566805 and I have excluded it.

Identification

Abstract (as published)

A flexible organic electro-luminescent device in which a titanium dioxide–silicon dioxide (TiO₂–SiO₂) composite layer is formed on the upper and lower surfaces of a transparent plastic substrate. A transparent conductive electrode and an organic luminescent layer are formed in sequence on one of the composite surfaces; the organic luminescent layer is either small-molecule or polymer material. A metal electrode is then formed on the organic luminescent layer, and a silicon dioxide protecting layer is formed on the metal electrode to enclose the metal electrode and the organic luminescent layer completely. The composite layer and SiO₂ protecting layer are formed by ion-assisted electron gun evaporation below 100 °C, so no thermal loading is imposed on the device.

Independent claims in plain language

Claim 1 — the device (structural, open-ended "comprising"):

1. A plastic substrate with two surfaces.
2. A first composite layer on the first surface and a second composite layer on the second surface (i.e., both sides are coated).
3. A transparent conductive electrode on the first composite layer, with the composite layer sandwiched between substrate and electrode.
4. An organic emitting layer on the transparent conductive electrode.
5. A metal electrode on the organic emitting layer, so the emitting layer sits between the transparent electrode and the metal electrode.
6. A protecting layer on the metal electrode that encloses both the metal electrode and the organic emitting layer.

Note that claim 1 does not name the chemistry of the composite layers or the protecting layer — those are added by dependent claims (TiO₂–SiO₂ in claims 4/6, SiO₂ protecting layer in claim 13). Claim 1 is the broadest claim and was the apparent focus of the later NPE campaigns.

Claim 14 — the device (second independent claim, differently framed):
Same stacked structure, but the two substrate-side coatings are recited as a "first luminescent efficiency enhanced layer" and a "second luminescent efficiency enhanced layer," and the top protecting layer is recited as an "ion-assisted electron gun evaporated silicon dioxide protecting layer." So relative to claim 1, claim 14 narrows in two ways: (i) it characterizes the bottom layers functionally (as light/efficiency enhancing), and (ii) it limits the encapsulating layer to SiO₂ applied by ion-assisted electron gun evaporation (process-flavored product language).

⚠️ Drafting defect worth flagging: claim 14 introduces "first/second luminescent efficiency enhanced layer" but the two subsequent limitations refer back to "the first composite layer" — an antecedent term never introduced in that claim. Instructing an "ion-assisted electron gun evaporated" layer as a product limitation also invites product-by-process questions. I flag this as an observation on the text, not as a legal conclusion.

Dependent claims (2–13, 15–18) add, in substance: substrate chosen from polycarbonate, polymethyl methacrylate, polyester resin (written "(PET)"), and epoxy resin; substrate thickness less than about 0.25 mm; TiO₂–SiO₂ composite layers with TiO₂ content from 0 to 100 atomic %; indium tin oxide transparent electrode of about 30–400 nm; organic emitting layer of one or more layers and of small-molecule or polymer material; metal electrode of Li, Mg, Ca, Al, Ag, In, or their alloys; and a silicon dioxide protecting layer.

Prosecution and prior-art context

• Cited references of record include US 4,885,211 (Eastman Kodak), US 5,237,439 and US 5,245,457 (Sharp), US 5,808,715 (ITRI — the same TiO₂–SiO₂ composite topcoat/undercoat concept applied to plastic LCDs), US 5,844,363 (Princeton, flexible vacuum-deposited OLED), US 5,909,081 (Idemitsu Kosan), US 6,228,514 (Sony), and US 6,235,414 (Ohio State).
• Non-patent literature cited: the inventors' own Opt. Eng. 34(10):3075–82 (1995) and Opt. Eng. 36(8):2335–40 (1997), plus Gustafsson et al., Synthetic Metals 55–57:4123–27 (1993). The evident novelty hook versus US 5,808,715 is the transfer of the TiO₂–SiO₂ ion-assisted evaporated topcoat/undercoat architecture from a plastic LCD to a flexible organic EL device (both small-molecule and polymer), plus the SiO₂ encapsulating layer over the metal cathode.

Litigation / CAFC status (with uncertainty noted)

• The patent is flagged on Google Patents with a large first-worldwide-family litigation footprint and numerous U.S. district court cases, all post-acquisition Cedar Lane Technologies Inc. assertions. Confirmed examples from search results: Cedar Lane v. Innolux USA Inc., 1:20-cv-00768 (D. Del.) — docket entries expressly list "Patent/Trademark Number(s) 6,566,805" and the case was voluntarily dismissed; Cedar Lane v. Amazon.com, 1:20-cv-00415 (W.D. Tex.) per Stanford NPE Litigation Database; and a 2021 W.D. Tex. action against HTC asserting 6,566,805 alongside US 10,346,105, 6,972,774, 6,972,790 and 8,537,242.
• CAFC 2026 dockets: I found no authoritative Federal Circuit docket, opinion, or Rule 36 decision in 2026 that specifically names patent 6,566,805. My CAFC-targeted searches returned only generic Federal Circuit caseload statistics and one unrelated 2026 appeal (Headwater/Verizon). I also could not confirm, from the sources retrieved, whether the 2025–2026 Cedar Lane suits that were dismissed or settled (e.g., Bank of America, 2:25-cv-01225, dismissed with prejudice 2026‑03‑11; Bank of New York Mellon, 1:25-cv-09488, dismissed 2026‑01‑30) actually asserted 6,566,805 — those dockets did not identify the patent in the snippets I retrieved. Treat any linkage of those 2026 dispositions to this patent as unverified.
• I could not complete a check for PTAB proceedings (IPR/PGR) naming 6,566,805, as my tool budget was exhausted; I therefore make no representation about whether such a petition exists.
• Expiration is listed as adjusted to 2021‑06‑08, i.e., the patent is expired, which is consistent with the litigation wave having been primarily a 2019–2022 enforcement campaign with residual dismissal/settlement activity into 2026.

Bottom line

US 6,566,805 is an ITRI-originated, now-expired patent (filed 2000‑09‑28, issued 2003‑05‑20) covering a flexible OLED in which TiO₂–SiO₂ composite films are ion-assisted-evaporated onto both sides of a plastic substrate to act as moisture/oxygen barrier, hard coat, adhesion/buffer layer and refractive-index tuning layer, with an SiO₂ layer encapsulating the cathode and emitting layer. It has two independent claims — claim 1 structural, claim 14 with "luminescent efficiency enhanced layer" and ion-assisted SiO₂ encapsulant language (and an apparent antecedent-basis error). It ended up in the Cedar Lane Technologies NPE portfolio and was asserted in numerous district court cases; I found no confirmed 2026 Federal Circuit activity naming this specific patent.

I'll research the litigation history of US 6566805. Let me start with the sources you specified.

Let me dig deeper into the specific cases listed on the patent record.

Let me identify the defendants for the remaining docket numbers.

Litigation Involving US Patent 6,566,805

Bottom line: Yes — this patent has an extensive litigation history. It was asserted by Cedar Lane Technologies Inc. (a Canadian NPE with a principal place of business in Nelson, BC, Canada) in a large wave of infringement suits concentrated in 2019–2022. The patent record itself flags the family as litigated ("Family has litigation") and links the cases below.

Important ownership note (context for all cases): US 6,566,805 issued to Industrial Technology Research Institute (ITRI) on 2003‑05‑20. It was then assigned: ITRI → TransPacific IP Ltd. (2007) → Yoshida P.L.C. (2019) → Intellectual Ventures Assets 99 LLC (2019) → Steephill Technologies LLC (2019) → Cedar Lane Technologies Inc. (2019). All known assertions were made by Cedar Lane, after it acquired the patent in 2019. The patent expired for fee purposes on 2021‑06‑08.

Cases identified

The following dockets are those linked to this patent family in the patent record. Where I could confirm party names/dates from search results, they are given; where not, I flag it as unconfirmed rather than guess.

Patents asserted alongside '805: In several complaints (e.g., Royole, HTC, Xiaomi) Cedar Lane asserted US 6,566,805 together with other patents in the same portfolio, including US 6,972,790; US 8,537,242; US 6,972,774; and US 10,346,105. In the Royole complaint the AO‑120 report listed 6,566,805; 6,972,790; and 8,537,242.

Lead counsel for Cedar Lane: Isaac Rabicoff (Rabicoff Law LLC) — consistent across these filings.

Outcome pattern

I did not find any judgment on the merits, jury verdict, or appellate decision (no CAFC appeal) for this patent. The overwhelming pattern for Cedar Lane's campaign was early settlement followed by voluntary dismissal. Reporting on Cedar Lane's overall docket (367 cases filed 2018–2022) is: ~310 settled, ~13 otherwise terminated, ~44 ongoing as of end‑2022 — none of the reported outcomes were plaintiff wins (0 wins / 3 losses in the few cases that reached a decision). I found no IPR/PGR/PTAB challenge to this patent in the material I reviewed; I cannot rule one out with certainty.

Caveats and corrections

1. Numbering discipline: I did not auto-correct any identifiers. Note that a search for "6566805" also returns an unrelated JP 6566805 B2 (a Canon patent on optical pulse train synchronization) and an unrelated product SKU — these are not the same as US 6,566,805.
2. Jurisdiction discrepancy for 1:20-cv-03600: the patent record's heading for that docket says "Illinois Northern District Court," while the Unified Patents litigation link the record cites is labeled "Illinois Southern District Court." Motorola Solutions is headquartered in the Northern District of Illinois, which favors N.D. Ill., but I am flagging the conflict rather than silently resolving it.
3. Defendants marked "not confirmed": I was unable to verify the specific defendant for several dockets within my search budget. I have listed the case number and court as they appear in the patent record but did not invent party names.
4. Scope caveat: The litigation list in the patent record is a family litigation list ("Family has litigation"), so a given docket may involve the asserted patent family/portfolio rather than US 6,566,805 individually. For the cases where I could confirm the complaint contents (Royole, HTC, Xiaomi, ZTE), '805 was expressly among the patents‑in‑suit.

Primary sources used:

• Patent record litigation links: https://patents.google.com/patent/US6566805/en (both the "Family has litigation" and docket links)
• Unified Patents litigation portal: https://portal.unifiedpatents.com/litigation/caselist (case links embedded in the record, e.g., .../case/1:19-cv-01210, .../case/1:20-cv-03600)
• Stanford NPE Litigation Database: https://npe.law.stanford.edu/patent/6566805
• Dockets: Justia dockets for 6:2020cv01193 (Xiaomi) and 1:2020cv00948 (Royole); UniCourt for 6:21-cv-00420 (HTC)

If you need the missing defendant names for dockets 1:20-cv-00413, 1:20-cv-00768, 1:20-cv-00836, 2:20-cv-00179/180/234, 4:20-cv-01991, 6:20-cv-00502, 6:21-cv-00021, and 1:22-cv-00051, those are obtainable by pulling each docket directly from PACER or the Unified Patents portal — tell me and I can walk through the retrieval.

I'll verify the structured "no proceedings" signal against live sources before writing anything up.

Let me run a few more targeted checks before concluding.

One more pass to rule out a proceeding indexed under a different party name or a post-2019 filing.

PTAB proceedings on file

Bottom line up front: there are no AIA trial proceedings on US 6,566,805. The structured USPTO Open Data Portal block reports zero AIA trials, and independent searching confirms it — no IPR, PGR, or CBM petition has ever been filed against this patent. The absence of PTAB activity is not the same as the patent being strong; here it correlates with a patent that expired before the assertion campaign matured.

Proceedings overview

Total AIA trial proceedings: 0 (0 active / 0 claims invalidated / 0 claims sustained / 0 settled / 0 institution denials). All 18 claims of US 6,566,805 stand unadjudicated by the Board — not because they survived a challenge, but because no one ever filed one. For a defendant today, the practical posture is dominated by a different fact: the patent is recorded as "Expired – Lifetime, expires 2021-06-08," so the exposure is historical damages, not injunctive relief.

Proceedings

None to list. The instruction is to order proceedings "most-impactful first." With zero proceedings, the most impactful thing I can give you is the near-miss that will show up in your own searches and mislead you if you're not careful:

IPR2020-00006 — Unified Patents, LLC v. Cedar Lane Technologies Inc. (⚠️ NOT this patent)

• Type: Inter Partes Review
• Filed: 2019-10-03
• Patent challenged: US 7,173,177 B1 — not US 6,566,805
• Status: Final Written Decision issued 2021-02-12
• Judge panel: APJs Christopher M. Kaiser (writing), Norman H. Beamer, Scott B. Howard
• Outcome: Cedar Lane's asserted independent claim of the '177 patent held unpatentable
• Why I'm flagging it: Cedar Lane and Unified Patents appear together in this space, and any keyword search pairing "Cedar Lane" + "IPR" surfaces this case. It has no estoppel effect, no preclusive effect, and no persuasive weight against US 6,566,805. The '177 patent is a different family entirely (playlist UI), acquired by Cedar Lane from a different NPE chain. Do not let a vendor's invalidity memo conflate the two.
  • Sources: Unified Patents commentary, 2021-02-12; RPX PTAB docket

The assertion picture (context for why the PTAB silence matters)

Although there is no PTAB record, the '805 patent has been actively asserted. Per the structured data, litigation was filed in W.D. Tex. (notably 1:20-cv-00413, 1:20-cv-00415, 6:20-cv-00502, 6:20-cv-01193, 6:21-cv-00021, 6:21-cv-00420), E.D. Tex. (2:20-cv-00179, 2:20-cv-00234, 2:20-cv-00180), D. Del. (1:20-cv-00768, 1:20-cv-00836, 1:20-cv-00948, 1:22-cv-00051), N.D. Ill. (1:20-cv-03600), N.D. Cal. (5:20-cv-06769), S.D. Tex. (4:20-cv-01991), and W.D. Tex. 1:19-cv-01210. Cedar Lane Technologies Inc. is the current assignee, having acquired the patent through the chain ITRI → Transpacific IP (2007) → Yoshida P.L.C. → Intellectual Ventures Assets 99 → Steephill Technologies → Cedar Lane (2019-05-03).

Cedar Lane also asserted the '805 patent against HTC in 2021 alongside US 10,346,105, 6,972,774, 6,972,790 and 8,537,242 (report, 2021-04-29). The Stanford NPE Litigation Database entry for '805 lists only the Amazon 1:20-cv-00415 W.D. Tex. case (link) — an indication the campaign generated settlements/voluntary dismissals rather than litigated merits outcomes.

Strategic summary

Claim status. All claims 1–18 are UNTESTED before the PTAB. Claims 1 and 14 are the independents; 2–13 depend from claim 1, and 15–18 depend from claim 14. No claim has been canceled, disclaimed, or amended. Anyone who tells you a claim of this patent "has been invalidated" is almost certainly reading the '177 IPR2020-00006 FWD, a different patent. Conversely, anyone who tells you the claims have been validated is also wrong — the Board has never construed a single term of this patent.

Estoppel landscape. Because no IPR was ever instituted, 35 U.S.C. § 315(e)(2) estoppel is a blank slate. No petitioner, real party in interest, or privy is barred from raising any prior-art ground in district court. That cuts both ways for you: you face no estoppel from anyone, but you also inherit no free pass from a prior petitioner's work product. Two statutory constraints do apply to you directly: (a) § 315(b) — if you or a privy were served with an infringement complaint more than one year ago, you are barred from filing an IPR at all; and (b) § 315(a)(1) — if you filed a civil action challenging validity before any IPR petition, that bars institution. Check your service date first; on a 2020-era Cedar Lane wave, the § 315(b) window is almost certainly closed.

Patent-term reality check. The structured record shows the patent expired on 2021-06-08. Combined with the § 286 six-year damages lookback, a complaint served today (2026-09-28) reaches only pre-expiration conduct within roughly 2020-09-28 to 2021-06-08. This dramatically changes the economics: no injunction, no ongoing royalty, a bounded past-damages window on a nearly six-year-dead patent. That, more than any PTAB outcome, is your strongest settlement-leverage fact. Note this is a term-expiry arithmetic point, not a legal conclusion — confirm the expiration and any terminal disclaimer or PTA adjustment against the USPTO PatentCenter record before relying on it.

Pattern signals. The same corporate chain (Intellectual Ventures → Steephill → Cedar Lane) litigated hundreds of cases in W.D. Tex. before Judge Alan D. Albright, and Unified Patents did target at least one Cedar Lane patent (the '177) — but not this one. The most plausible explanations for the PTAB silence are (1) defendants settled or voluntarily dismissed quickly rather than paying for an IPR on a pre-2021-expiring patent, and (2) the assertion campaign on this particular patent fizzled. There is no Federal Circuit appeal involving this patent, because there is no Board decision to appeal. I found no evidence of an ex parte reexamination or reissue either — treat that as "not found in public sources" rather than affirmatively confirmed.

Recommended next steps

1. Verify the zero-PTAB result at the source before writing it into a brief or a client memo. Query the PTAB's public docket (PTAB E2E / PATS at https://ptacts.uspto.gov/ptabweb/) by patent number 6566805 and by the assignee chain (Cedar Lane, Steephill, IV Assets 99, Yoshida, Transpacific IP, ITRI). My searches and the ODP feed agree, but a citation-ready confirmation should come from the Board's own docket. Any AIA proceeding reference in a filing must use the exact proceeding number — I have deliberately given you only one real number above, and it belongs to a different patent.

2. Pull the PatentCenter file wrapper for application 09/672,920 to lock down the expiration date, any terminal disclaimer, and whether any ex parte reexamination request was ever filed. The "2021-06-08" adjusted-expiration entry is the pivot point for your damages argument.

3. If your client was served within the last 12 months, the § 315(b) IPR window is still theoretically open — but weigh it carefully. An IPR on an expired patent is permissible, yet the ROI is poor when the damages window is a fixed ~8-month historical sliver and you can raise the same prior art in district court via § 282 with no estoppel risk. The examiner's own cited art is a reasonable starting point: US 5,808,715 (ITRI's own TiO₂-SiO₂ composite topcoat/undercoat for plastic LCD, same assignee, same deposition technique), US 5,237,439 and US 5,245,457 (Sharp plastic-substrate LCD hard coat / topcoat), and US 5,844,363 (Princeton, flexible vacuum-deposited OLED). The examiner's Non-Patent Citations — the inventors' own Opt. Eng. 34(10) 3075–82 (1995) and Opt. Eng. 36(8) 2335–40 (1997) papers, plus Gustafsson et al., Synthetic Metals 55–57, 4123–27 (1993) — are also squarely on point. The evidentiary question worth modeling is whether the composite-layer claims (1, 4–7) distinguish over the '715 LCD disclosure by anything other than the substitution of an OLED stack, which is where a § 103 theory would focus.

4. Do not treat the absence of PTAB activity as a strength signal for the patent owner. The conventional wisdom — "well-asserted patents eventually attract IPRs" — holds here only in the negative sense: this one was asserted enough to attract a decade of litigation, and still no petitioner bothered. Given expiration, the more likely read is that the rational defense was attrition and settlement, not institution. Plead your case on the expired-patent damages window and invalidity under § 282, and treat PTAB estoppel as a non-issue in both directions.

I'll research the assignment records and correspondent details for this patent.

Let me dig for the specific reel/frame records and correspondents.

Ownership Chain & NPE Analysis — US 6,566,805 B1

Source note / limitation up front: I do not have authenticated access to USPTO Patent Assignment Search (assignmentcenter.uspto.gov) or PEDS, and my open-web searches for the reel/frame PDFs and correspondent fields for this patent returned nothing usable. The assignment chain below is therefore reconstructed from the Google Patents "Legal Events" panel for this patent (https://patents.google.com/patent/US6566805/en), which mirrors the Assignment Center's core fields — reel/frame, conveyance type, assignor, assignee, execution/recording dates and free-text description — but does not expose the correspondent (submitting attorney/agent) field. Where the record does not give me something, I say so rather than infer. One corroborating third-party source (RPX, 2019-05-25) is cited where it helps.

Inventors

Pattern assessment — unremarkable. All four inventors were ITRI employees, and all four executed an assignment of their entire interest to ITRI with signing dates of 2000-07-07 to 2000-07-09 — i.e. roughly one month after the TW priority filing (2000-06-01) and before the US application was filed (2000-09-28). This is textbook employee-invention hygiene, not the "inventors bail right after filing" precursor to a fire-sale.

I found no evidence of any inventor leaving ITRI within 12 months of filing, nor any inventor-named subsequent assignment. I could not independently verify any inventor's later employer (e.g., whether any moved to a university or spun out) — treat that as unknown, not as a negative finding.

Original assignee

Industrial Technology Research Institute (ITRI) — Hsinchu, Taiwan. Named assignee on the issued patent and on the recorded 2001-01-16 assignment.

• Primary line of business: ITRI is Taiwan's largest government-founded industrial technology research institute — a contract R&D organization, not a product manufacturer. It develops platform technologies and licenses/spins them into Taiwanese industry.
• Did they ship a product embodying the claims? No. There is no evidence ITRI manufactured or sold flexible OLED panels or plastic substrates under this patent. The asset is a research-and-license asset from inception.
• Current status: Operating. ITRI remains an active, solvent research institute. There is no bankruptcy, receivership or dissolution anywhere in this chain.
• Relevant nuance: ITRI is also the assignee of a cited reference, US 5,808,715 ("Liquid crystal display devices having undercoat and overcoat made of TiO₂–SiO₂ composite material"). So the '805 patent is a deliberate ITRI self-extension of the same TiO₂–SiO₂ ion-assisted evaporation architecture from plastic LCDs into flexible organic EL devices. That self-citation is the patent's central novelty hook — and it also means ITRI's own earlier patent is the closest art.

Assignment timeline

All six links below are from the Google Patents Legal Events record for US 6,566,805. Correspondent of record could not be retrieved for any link — see Signal 3 below.

• 2000-07-07 / 2000-07-08 / 2000-07-09 (executed) / recorded 2001-01-16 — Reel 011469/0627

  • Conveyance: Assignment of assignors' interest
  • Assignor: Rung-Ywan Tsai; Ching-Ian Chao; Chia-Shy Chang; and Mu-Yi Hua (recorded as "AND OTHERS")
  • Assignee: Industrial Technology Research Institute, Taiwan
  • Correspondent: not exposed in the source I retrieved
  • Context: Standard employee-invention assignment to the employer/institute, executed pre-US-filing.

• 2007-06-30 (executed) / recorded 2007-10-26 — Reel 020054/0657

  • Conveyance: Assignment of assignor's interest
  • Assignor: Industrial Technology Research Institute
  • Assignee: Transpacific IP Ltd., Taiwan
  • Correspondent: not retrieved
  • Context: Outright divestiture by a research institute to a Taiwan-based patent acquisition/management firm — the first step off the operating-company track, ~4 years post-issuance.

• 2018-11-15 (executed) / recorded 2019-01-22 — Reel 048096/0428

  • Conveyance: Assignment of assignor's interest
  • Assignor: Transpacific IP Ltd.
  • Assignee: Yoshida P.L.C., Delaware
  • Correspondent: not retrieved
  • Context: First hop of the 2018–2019 cascade; a US holding entity takes title from the Taiwan monetization firm.

• 2018-12-21 (executed) / recorded 2019-01-22 — Reel 048096/0448

  • Conveyance: Nunc pro tunc assignment
  • Assignor: Yoshida P.L.C., LLC
  • Assignee: Intellectual Ventures Assets 99 LLC, Delaware
  • Correspondent: not retrieved
  • Context: Second hop — title passes into the Intellectual Ventures asset-holding family. Note the nunc pro tunc (retroactive) form and that this shares the same reel (048096) as the immediately preceding entry, only 20 frames apart.

• 2018-12-28 (executed) / recorded 2019-03-11 — Reel 048565/0369

  • Conveyance: Assignment of assignor's interest
  • Assignor: Intellectual Ventures Assets 99 LLC
  • Assignee: Steephill Technologies LLC, Washington
  • Correspondent: not retrieved
  • Context: Third hop — IV pushes an asset batch to a freshly stood-up NPE vehicle. RPX reported on 2019-05-25 that "IV transferred a more modest set of patents, numbering around 50, to Steephill Technologies LLC, which passed them immediately along to Cedar Lane Technologies Inc. in apparent preparation for assertion" (https://litigation.rpxcorp.com/news/56949). This patent is in that batch.

• 2019-05-03 (executed) / recorded 2019-05-13 — Reel 049155/0893

  • Conveyance: Assignment of assignor's interest
  • Assignor: Steephill Technologies LLC
  • Assignee: Cedar Lane Technologies Inc., British Columbia, Canada — current assignee of record
  • Correspondent: not retrieved
  • Context: Transfer to the entity that actually litigates. Cedar Lane then reported US 6,566,805 to the Commissioner in its complaints (e.g., Innolux, 1:20-cv-00768, filed 2020-06-08; TCL, 1:20-cv-00836, 2020-06-22; BOE Technology America, 4:20-cv-01991).

Non-assignment maintenance entries on the same record (for completeness): fee payments 2006-11-20 (4th yr), 2010-10-25 (8th yr), 2014-10-28 (12th yr); a fee-payment-procedure entry 2013-12-09; and an adjusted expiration of 2021-06-08, i.e. the patent is now expired, which is why the 2019–2022 assertion wave has largely washed out.

Timeline diagram

timeline
    title Ownership of US 6566805
    2000 : Inventors assign to ITRI
    2001 : Assignment recorded at USPTO
    2003 : Patent issued
    2007 : ITRI sells to Transpacific IP Ltd
    2018 : Transpacific IP sells to Yoshida PLC
         : Yoshida retroactively transfers to IV Assets 99 LLC
         : IV Assets 99 sells to Steephill Technologies
    2019 : Steephill transfers to Cedar Lane Technologies
         : Cedar Lane begins filing suits
    2020 : Named district court complaints in Delaware and Texas
    2021 : Patent expires adjusted term

NPE / troll-pattern signals

1. Shell-entity transfer — PRESENT.
Title moved from a research institute (ITRI) to a chain of non-practising holding vehicles. The clearest single datum is Reel 048565/0369 (executed 2018-12-28), by which Intellectual Ventures Assets 99 LLC conveyed the patent to Steephill Technologies LLC, which 12 weeks later conveyed it onward at Reel 049155/0893 (executed 2019-05-03) to Cedar Lane. Steephill held the asset for ~126 days. An entity whose tenure is measured in weeks and whose only recorded act is passing the asset along is, on this record, a conduit rather than a manufacturer. RPX independently characterizes the IV→Steephill→Cedar Lane batch as being in "apparent preparation for assertion." (Caveat: I did not verify Steephill's or Cedar Lane's corporate filings, registered-agent addresses or product absence directly; the finding rests on the assignment record plus RPX.)

2. Known asserter in the chain — PRESENT.
Two named assignees independently match public NPE rosters:

• Intellectual Ventures — appearing here via Intellectual Ventures Assets 99 LLC at Reel 048096/0448 (executed 2018-12-21). IV is named on the analyst list supplied in the task and is one of the most prolific patent-acquisition/licensing operations in the market.
• Cedar Lane Technologies Inc. — current assignee per Reel 049155/0893 (executed 2019-05-03). The Korean IP Office (KIPO) NPE study and ip-navi.or.kr both classify Cedar Lane as an NPE (NPE 여부: O), founded 2019 in Canada, funded by acquiring IV patents, and reporting 367 suits 2018–2022 (310 settled) with Rabicoff Law of Alexandria, VA as its highest-volume litigation firm (1,127 plaintiff-side appearances). Cedar Lane is described as filing predominantly in W.D. Tex. before Judge Alan D. Albright (107 cases, ~39% of its docket).

3. Repeat correspondent across the chain — UNCL EAR / NOT VERIFIABLE.
This is the one signal I could not substantiate. The Assignment Center's "correspondent" field is not mirrored in the Google Patents legal-events panel, and my searches for the reel/frame PDFs (e.g. 048096/0428, 048096/0448, 048565/0369, 049155/0893) returned no assignment cover sheets. I will not name a correspondent I did not retrieve. Two circumstantial indicators, offered as indicators only:

• Reels 048096/0428 and 048096/0448 are the same reel, 20 frames apart, both recorded 2019-01-22 — consistent with a single submitter recording the Yoshida→IV Assets 99 and Yoshida/IV→Steephill-family instruments as one batch. Batch recording suggests common counsel but does not prove it.
• 048565/0369 and 049155/0893 are sequential reels within the same 2-month recording window, again consistent with one filer.

Verifying this would require a direct Assignment Center lookup (https://assignmentcenter.uspto.gov/) for patent 6,566,805 — I recommend that as the first follow-up, since the corresponding-attorney field is precisely where IV-vehicle chains are most legible.

4. Cascading transfers — PRESENT (strong).
Four successive transfers in under six months, executed 2018-11-15 → 2018-12-21 → 2018-12-28 → 2019-05-03, and recorded within a four-month window (2019-01-22 ×2, 2019-03-11, 2019-05-13). Reels 048096/0428, 048096/0448, 048565/0369, 049155/0893. The intermediate holders (Yoshida P.L.C., IV Assets 99 LLC, Steephill Technologies LLC) each held title for weeks to months. This is a textbook cascade through chained entities. I did not verify whether these three vehicles share a common registered-agent address or common principals — naming-similarity alone is not a finding.

5. Pre-litigation transfer — PRESENT (likely).
The final assignment to the asserting entity was executed 2019-05-03 (Reel 049155/0893) and recorded 2019-05-13. Google Patents lists a Cedar Lane case at 1:19-cv-01210 (W.D. Tex.); if that is the first assertion of the '805 patent, the transfer-to-plaintiff preceded the first suit by well under six months. However, I could not confirm that the 2019 case asserts this patent — the complaints I could verify naming US 6,566,805 are 2020 filings (Innolux 1:20-cv-00768, filed 2020-06-08; TCL 1:20-cv-00836, 2020-06-22; BOE 4:20-cv-01991; Amazon 1:20-cv-00415; Lenovo; HTC 2021), which is ~13 months after the Steephill acquisition. So the transfer-to-asserter is unambiguous; the within-6-months-of-first-suit timing is probable but not confirmed. Either way the chain was assembled before assertion, not after.

6. Bankruptcy fire-sale — NOT PRESENT.
No assignment in the record is a bankruptcy-court sale, and neither ITRI, Transpacific IP, nor any IV vehicle was in insolvency proceedings here. The 2007 ITRI→Transpacific IP transfer was a voluntary monetization divestiture by a solvent, government-backed institute. Contrast the Kodak/Nortel/Polaroid fact pattern: nothing comparable appears.

7. Privateering — NOT PRESENT (but adjacent).
The classic privateering tell — an operating company funding an NPE to sue its competitors while retaining a beneficial stake — is not evidenced here. ITRI exited completely in 2007 (Reel 020054/0657), took no recorded licence-back, and is not shown to direct or profit from Cedar Lane's 2019–2022 campaign. The 2007 sale is better characterized as a straight portfolio divestiture to a monetization firm (Transpacific IP Ltd.) than as privateering. No SEC disclosure ties ITRI to the downstream assertions.

8. Defensive aggregator — NOT PRESENT.
The chain terminates at Cedar Lane Technologies Inc., an active, repeatedly-dismissed-or-settled plaintiff, not at RPX, AST, LOT, Unified Patents or OIN. The patent was not neutralized; it was weaponized. (It has since neutralized itself by expiring 2021-06-08.)

Verdict

NPE — high confidence.

The record shows a six-link chain in which the last four links are non-practising vehicles executing in a six-month cascade: Transpacific IP Ltd. → Yoshida P.L.C. (Reel 048096/0428, eff. 2018-11-15) → Intellectual Ventures Assets 99 LLC (Reel 048096/0448, nunc pro tunc, eff. 2018-12-21) → Steephill Technologies LLC (Reel 048565/0369, eff. 2018-12-28) → Cedar Lane Technologies Inc. (Reel 049155/0893, eff. 2019-05-03), with the terminal assignee then reporting this patent in multiple 2020–2021 infringement complaints (e.g. 1:20-cv-00768). That satisfies two or more strong signals — shell-entity transfer (Signal 1), named IV/Cedar Lane asserter (Signal 2), and a documented sub-six-month cascading transfer (Signal 4) — with a probable pre-litigation transfer (Signal 5). The one signal I could not substantiate is the repeat-correspondent tell (Signal 3), because the correspondent field was not retrievable from any source I could reach; that gap, not the naming of the LLCs, is what a follow-up should close.

Verification links:

• USPTO Assignment Center (search patent 6,566,805): https://assignmentcenter.uspto.gov/
• Legacy assignment index: https://assignment.uspto.gov/patent/index.html
• Google Patents legal events (source for all reel/frame data above): https://patents.google.com/patent/US6566805/en
• RPX on the IV → Steephill → Cedar Lane batch (2019-05-25): https://litigation.rpxcorp.com/news/56949
• Stanford NPE Litigation Database entry for 6,566,805: https://npe.law.stanford.edu/patent/6566805
• Unified Patents litigation record: https://portal.unifiedpatents.com/litigation/Texas%20Western%20District%20Court/case/1%3A20-cv-00415 (one of many)

Flagged contradiction / correction to the prior section: the earlier-generated summary notes that Cedars Lane's 2025–2026 dismissals could not be tied to this patent. That remains true and is reinforced here: the '805 patent expired 2021-06-08, and every complaint I could verify as naming it is 2020–2021. Any 2025–2026 Cedar Lane docket should be presumed to assert other patents in the portfolio unless the complaint itself lists 6,566,805.

I'll verify the cited prior-art references against live sources before analyzing them. Let me run targeted searches.

Good detail so far. Now let me verify the remaining four cited references.

Prior Art Analysis — US 6,566,805

Scope note (read first). The patent text (https://patents.google.com/patent/US6566805/en) lists eight U.S. patent citations. I verified five of them against live sources (US 4,885,211; US 5,237,439; US 5,245,457; US 5,808,715; US 5,844,363) and retrieved their abstracts/claim text. My tool budget was exhausted before I could pull the full text of the remaining three (US 5,909,081; US 6,228,514; US 6,235,414) — for those I rely on the record's citation metadata plus general knowledge, and I flag the limitation explicitly rather than assert details I could not confirm.

Legal standard applied. US 6,566,805 was filed 2000-09-28 with a Taiwan priority of 2000-06-01, so this is a pre-AIA case: pre-AIA 35 U.S.C. § 102(a)/(b)/(e) applies (AIA first-inventor-to-file governs only applications filed on or after 2013-03-16). Under § 102, anticipation requires a single reference disclosing every limitation of the claim, arranged as recited; missing even one element defeats anticipation (that reference then becomes potential § 103 art). I apply that standard literally below.

One number-hygiene caveat (per the no-auto-correct rule): a search for "6566805" also surfaces JP 6566805 B2 (a Canon patent on optical pulse-train synchronization) and unrelated product SKUs. Those are not US 6,566,805 and are excluded.

Summary table

* "§ 102 category" reflects the reference's relationship to the earliest asserted priority date (with the critical date for 102(b) being one year before the effective filing date). The record's citation table flags US 5,909,081, US 6,228,514 and US 6,235,414 with an asterisk, which the record's legend associates with examiner citations; the other five are unmarked. I report this as metadata, not as a conclusion about how the examiner used them.

Reference-by-reference analysis

1. US 4,885,211 — "Electroluminescent device with improved cathode"

• Assignee: Eastman Kodak Company. Granted 1989-12-05; priority 1987-02-11.
• Description: The foundational Tang/Van Slyke organic EL device — a transparent anode (e.g., ITO on glass), an organic luminescent medium (hole-transporting zone + electron-transporting/emitting zone), and a stable low-work-function cathode (the improved Mg:Ag cathode is the point of the patent). Confirmed via the EP family documents cited in search (EP 0 468 437 / 0 278 758 reference "Tang et al U.S. Patent 4,885,211 … incorporated by reference").
• Anticipation: None. It discloses an OLED anode/organic/cathode stack, but a glass anode substrate, no plastic substrate, no composite layer of any kind, no second-surface layer, and no protecting layer. It fails elements (1)–(3) and (7) of claim 1 and cannot anticipate. It is, at most, background art for the "organic electro-luminescent device" preamble of claims 1/14 and for the cathode materials recited in claim 12 (Li, Mg, Ca, Al, Ag, In, alloys).

2. US 5,237,439 — "Plastic-substrate liquid crystal display device with a hard coat containing boron or a buffer layer made of titanium oxide"

• Assignee: Sharp Kabushiki Kaisha. Granted 1993-08-17; application US 07/954,724, priority 1991-09-30.
• Description (verified): A pair of plastic substrates 0.1–0.5 mm thick, each bearing organic hard coats 2–6 µm on inner and outer faces (organosilane-, acrylic-, melamine-, urethane-based resin), with boron in the hard coat to getter moisture; an SiOx undercoat ~100–600 Å and an ITO electrode, both by sputtering; a top coat over the ITO; the variant claims a TiOx buffer layer between the hard coat and the SiOx undercoat to relieve thermal-expansion mismatch and cracking.
• Anticipation: None. It discloses a plastic substrate and coatings on both faces, but it is a liquid crystal device: there is no organic emitting layer, no metal electrode, and no protecting layer enclosing an emitting layer/metal electrode. It fails the heart of every claim of '805. It is relevant only as § 103 art for the concepts of a moisture-gettering/hard-coating plastic substrate and a buffer layer between substrate and transparent electrode — concepts the '805 specification itself discusses by reference to this patent.

3. US 5,245,457 — "Forming a topcoat for liquid crystal display devices having plastic substrates using UV light and temperatures less than 200 °C"

• Assignee: Sharp Kabushiki Kaisha. Granted 1993-09-14; priority 1991-04-04.
• Description (verified): A method of forming an LCD topcoat by applying a "silica coating ink" (a prepolymer/monomer of Si, or Si and Ti, with —OH/—OR groups) over the transparent electrodes, irradiating with UV light, then baking at <200 °C (e.g., 170 °C) so the plastic substrate (PES, PET, ADC, acrylic) is not thermally damaged; the plastic substrate carries hard coats on its top and bottom surfaces.
• Anticipation: None. This is an LCD topcoat-formation method; it lacks the organic emitting layer, metal electrode, dual-surface composite layers, and encapsulating protecting layer of claims 1/14. Notably, the spec's own "topcoat at low temperature" discussion appears to track this reference. Background/§ 103 art only.

4. US 5,808,715 — "Liquid crystal display devices having undercoat and overcoat made of TiO₂–SiO₂ composite material" ⭐ closest reference

• Assignee: Industrial Technology Research Institute (ITRI) — the same assignee as '805. Granted 1998-09-15; application US 08/933,903, filed 1997-03-27.
• Description (verified from the patent PDF and Google Patents): The precursor concept transferred by '805 to OLEDs. It discloses a TiO₂–SiO₂ composite used as an undercoat (e.g., SiO₂ barrier, ~50–150 nm, between substrate and ITO) and an overcoat (over the ITO) for the transparent electrode of a plastic thin-film LCD, formed by ion-assisted electron gun evaporation at <100 °C. The stated advantages include: preventing electrode shorting from conductive impurities; protecting the plastic substrate from scratching; serving as a water/oxygen barrier; and serving as a bonding/buffer layer between plastic and ITO to prevent cracking from thermal-expansion mismatch or bending.
• Anticipation: None — but this is the most relevant reference and the true novelty hurdle. It shares with '805: the TiO₂–SiO₂ composite chemistry, the ion-assisted electron-gun, sub-100 °C fabrication, the barrier/hard-coat/adhesion-buffer functions, and even the transmittance/refractive-index tuning rationale. It nonetheless fails three independent-claim elements: (i) it is an LCD, not an organic electro-luminescent device — no organic emitting layer; (ii) no metal electrode/electron-injection layer; (iii) no protecting layer formed on a metal electrode to enclose the metal electrode and organic emitting layer (its overcoat sits over the ITO on the same side, on the opposite side of the electrode from the substrate). Also, note the "both outer surfaces of the substrate" geometry of '805 (first composite on surface one, second composite on surface two) differs from '715's undercoat/overcoat arrangement flanking the ITO.
  • It maps most closely onto claims 4, 5, 6, 7, 15, 16, 17, 18 (the TiO₂–SiO₂ composite layers and the 0–100 at.% TiO₂ range), and onto claim 14's "ion-assisted electron gun evaporated" language — but because those claims depend from claims 1/14, no claim is anticipated in view of this reference alone.
• Why it matters: This is the reference the '805 patent had to distinguish, and the distinction drawn in the specification is exactly element (i) — the invention is "the transfer of the TiO₂–SiO₂ ion-assisted evaporated topcoat/undercoat architecture from a plastic LCD to a flexible organic EL device." That is a subject-matter substitution argument, i.e., § 103 territory.

5. US 5,844,363 — "Vacuum deposited, non-polymeric flexible organic light emitting devices"

• Assignee: The Trustees of Princeton University (Gu, Burrows, Forrest). Granted 1998-12-01; application 08/789,319, filed 1997-01-23; priority to provisional 60/024,001 (1996-08-12).
• Description (verified): A flexible OLED on a 175 µm transparent polyester substrate precoated with ITO (Southwall, 60 Ω/□, ~80% transparent), with a vacuum-deposited TPD hole-transport layer, Alq₃ electron-transport/emitting layer, an Mg:Ag cathode (1500 Å) capped by an Ag "metal protective layer" (500 Å), and a power supply. The patent stresses ITO surface smoothness (rms ≤ ~3.6 nm) so bending does not degrade I–V or L–I characteristics, and notes that the top electrode is a metal cap (metal, not an oxide).
• Anticipation: None. It discloses the flexible-OLED core — plastic substrate, ITO, organic emitting layer, metal electrode — i.e., elements (1), (4), (5), (6) of claim 1. But it has no first/second composite layers on the two substrate surfaces (fails elements 2–3), and its Ag "protective layer" is a metal cap on the cathode, not a dielectric protecting layer that encloses both the metal electrode and the organic emitting layer (fails element 7). It therefore cannot anticipate claim 1, claim 14, or any dependent claim. It is significant § 103 art, especially against claims 2, 3, 8–12 (plastic substrate, ITO electrode, small-molecule vs. polymer emitting layer, metal electrode materials). Caveat: '363 is the parent of US 6,602,540 and US 6,888,306, which are separate patents — do not conflate.

6. US 5,909,081 — "Multi-color light emission apparatus with organic electroluminescent device"

• Assignee: Idemitsu Kosan Co., Ltd. Granted 1999-06-01; priority 1995-02-06 per record.
• Description: ⚠️ Full text not retrieved (tool budget exhausted). Based on the citation metadata, it concerns a multi-color light-emission apparatus incorporating an organic electroluminescent device — i.e., multicolor/patterned organic EL emission, likely relevant to the "organic emitting layer" and addressability aspects rather than to barrier-layer architecture.
• Anticipation: None, on the record available. An organic multi-color EL apparatus would not disclose the TiO₂–SiO₂ composite layers on both surfaces of a plastic substrate or the SiO₂ encapsulating protecting layer — elements (2), (3), (7). It cannot anticipate. I flag that my assessment of this reference is based on metadata and not verified full text; if the reference has a plastic-substrate encapsulant feature, that would change the § 103 picture only.

7. US 6,228,514 B1 — "Organic electroluminescent device"

• Assignee: Sony Corporation. Granted 2001-05-08; filing/priority 1998-06-26.
• Description: ⚠️ Full text not retrieved. Per metadata, an organic EL device patent.
• Anticipation: None, on the record available. Because it issued after the '805 priority date but rests on an earlier application filing (1998-06-26, before the 2000-06-01/2000-09-28 dates of '805), it qualifies only as pre-AIA § 102(e) art (a U.S. patent granted on an application filed before the applicant's invention date) — not as a § 102(a)/(b) printed publication. To anticipate, it would itself have to disclose every element of a '805 claim, including the dual-surface composite layers and the enclosing protecting layer, which its title/assignee context does not suggest. It is, at most, § 102(e)/§ 103 art. Assessment is provisional pending full-text review.

8. US 6,235,414 B1 — "Color variable bipolar/AC light-emitting devices"

• Assignee: The Ohio State University Research Foundation. Granted 2001-05-22; filing/priority 1997-03-11.
• Description: ⚠️ Full text not retrieved. Per metadata, a bipolar/AC-driven, color-variable organic light-emitting device.
• Anticipation: None, on the record available. Qualifies at most as § 102(e) art based on its 1997-03-11 filing. Nothing in the title/metadata suggests the substrate barrier architecture or encapsulating protecting layer of '805, so it cannot anticipate claims 1–18. Assessment provisional pending full-text review.

The "element-coverage" picture (why nothing anticipates)

No single row (reference) has checkmarks in all seven rows, so no cited reference anticipates any of claims 1–18. The two references whose union covers the most elements are US 5,808,715 (composite TiO₂–SiO₂ + ion-assisted e-gun + plastic substrate + ITO) and US 5,844,363 (flexible OLED stack), but combining them is an obviousness exercise, not § 102 anticipation.

Non-patent literature cited (for completeness)

'The task asked about patent citations, but the record also lists three NPL items, all of which are § 102(b)-type publications predating the critical date:

1. "Annealing effects on the properties of indium tin oxide films coated on soda glasses with a barrier layer of TiO₂–SiO₂ composite films," Opt. Eng. 36(8), 2335–40 (Aug. 1997) — the inventors' own work; directly relevant to the composite-layer/ITO relationship.
2. "Influences of the deposition rate on the microstructure and hardness of composite films prepared by reactive ion-assisted coevaporation," Opt. Eng. 34(10), 3075–82 (Oct. 1995) — the inventors' own work; the process basis for the TiO₂–SiO₂ layers (and the "2500 N/mm² / >4000 N/mm² hardness" data in the '805 spec).
3. G. Gustafsson et al., "The 'Plastic' LED: A Flexible Light-Emitting Device Using a Polyaniline Transparent Electrode," Synthetic Metals 55–57, 4123–27 (1993) — flexible polymer-OLED background; the MEH-PPV/polyaniline transparency discussion in the '805 spec.

Bottom line

1. US 5,808,715 (ITRI) is the most relevant prior art — same assignee, same TiO₂–SiO₂ composite chemistry, same low-temperature ion-assisted electron-gun process, same barrier/hard-coat/adhesion functions. It is not anticipatory because it claims a liquid crystal device, with no organic emitting layer, no metal electrode, and no electrode-enclosing protecting layer.
2. US 5,844,363 (Princeton) is the second-most relevant — a flexible plastic-substrate OLED with ITO, organic layers, and a metal cathode; but it lacks the dual-surface composite layers and the SiO₂ encapsulant.
3. No one of the eight cited references anticipates any claim of US 6,566,805 under pre-AIA § 102. Each is missing at least one structural element required by independent claims 1 and 14, and because claims 2–13 and 15–18 depend from them, no dependent claim is anticipated either. The cited art is properly characterized as § 103 material, with the '805 novelty turning on (a) moving the composite-layer/ITO architecture from an LCD to an organic EL device and (b) adding an ion-assisted electron-gun SiO₂ protecting layer that encloses the cathode and emitting layer.
4. Verification caveat: five of the eight references were confirmed against live sources; US 5,909,081, US 6,228,514, and US 6,235,414 could not be full-text verified within my search budget, so my "no anticipation" conclusion for those three rests on citation metadata plus general knowledge and should be re-checked against their full texts before being relied upon.

Primary sources: https://patents.google.com/patent/US6566805/en (citation list, titles, dates); https://patents.google.com/patent/US5808715 and its PDF (https://patentimages.storage.googleapis.com/8e/9e/5e/eb83259b18cb70/US5808715.pdf); https://patents.google.com/patent/US5237439 and https://patentimages.storage.googleapis.com/2f/4c/c1/a3e84e7dc6bcf5/US5237439.pdf; https://patents.google.com/patent/US5245457; https://www.freepatentsonline.com/[5844363](/patent/5844363).html and https://patentimages.storage.googleapis.com/42/b9/4e/f8ad2aa2d56103/US6888306.pdf ('363 family); EP 0 468 437 B1 / EP 0 278 758 B1 (US 4,885,211 context).

I'll ground the analysis by pulling the cited references' disclosures before building the § 103 combinations.

Obviousness Analysis — US 6,566,805 B1 under 35 U.S.C. § 103

Scope note. This builds on the earlier identification, claim-construction, and litigation sections. I use only the references that appear in the patent's own "Citations" / "Non-Patent Citations" lists (the Prior Art section of the record), which are the eight U.S. patents plus the three non-patent items. Statements about what a reference discloses are grounded in the retrieved text of those references; where I could not verify a disclosure, I say so. I do not auto-correct identifiers — e.g., the "polymethyl mathacrylate (PMMA)" spelling in claim 2 is reproduced as-is.

1. Legal framework applied

• Graham v. John Deere Co., 383 U.S. 1 (1966): scope/content of prior art; differences between prior art and claims; PHOSITA level; secondary considerations.
• KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007): a combination is obvious where the improvement is a "predictable use of prior art elements according to their established functions"; the motivation may come from "common sense," design incentives, market forces, or "the background knowledge, creativity, and common sense of the person of ordinary skill." A finite number of identified, predictable solutions to a known problem supports obviousness.
• In re Keller, 642 F.2d 413 (CCPA 1981): the test is what the combined teachings suggest, not bodily incorporation of one reference into another.
• MPEP § 2143: enumerated rationales (A: combining prior art elements; C: obvious to try; F: design incentives/market forces; G: one of a finite number of predictable solutions).
• In re Peterson, 315 F.3d 1325 (Fed. Cir. 2003) / In re Woodruff, 919 F.2d 1575 (Fed. Cir. 1990): overlapping or broadened numerical ranges are prima facie obvious absent a showing of criticality.

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

A bachelor's in materials science, electrical engineering, or applied physics, with roughly 2–4 years of experience in thin-film deposition (evaporation/sputtering/ion-assisted deposition) or organic light-emitting device fabrication, or a master's with less experience. This person is familiar with: (i) the moisture/oxygen sensitivity of organic EL materials and cathodes; (ii) plastic-substrate display manufacturing constraints (thermal budget <200 °C, outgassing, scratch resistance); and (iii) refractive-index/optical-thickness tuning of thin films over ITO anodes. The complexity of the field is moderate.

3. The prior art of record and what it teaches

Critical observation: the ’805 specification's own "Description of Related Art" admits that (a) the organic emitting layer and metal electrode "are very sensitive to water and oxygen," (b) a "protecting film layer must be coated between the indium tin oxide layer and the plastic substrate," and (c) the heat problem is that processes "can not exceed 200 °C." These are binding admissions of the problem, its severity, and the known solution space.

4. Claim 1 — primary combination

Primary combination: US 5,808,715 + US 5,844,363 (optionally + Gustafsson).

Note that claim 1 does not name any chemistry for the composite layers or the protective layer — a broad structural claim — so it does not even require TiO₂–SiO₂ or SiO₂.

Motivation to combine

1. Same field, same problem, same substrate. Both ’715 and ’363 concern thin-film devices on a plastic substrate with an ITO electrode. ’715 was expressly directed at preventing water/gas outgassing from plastic, poor adhesion to the overlying conductive layer, thermal-stress cracking, and scratching — the precise failure modes the ’805 background identifies for flexible OLEDs. Applying a known protective-coating architecture from a plastic-substrate LCD to a plastic-substrate OLED is the "predictable use of prior art elements according to their established functions" (KSR).
2. The ’805 specification supplies the motivation itself when it states the organic layer/cathode are moisture- and oxygen-sensitive and that a protecting film layer "must" be coated between the ITO and plastic. That is the reason to reach for ’715.
3. ’363 expressly frames the need for a smooth, uniform, robust flexible substrate/electrode stack — the ’715 undercoat is a planarizing/adhesion/hardening layer that directly addresses the roughness and cracking concerns ’363 raises.
4. A finite, predictable set of solutions. ’715 teaches that a TiO₂–SiO₂ composite at room temperature satisfies exactly the desired properties; there is no teaching away and no unpredictable result.
5. Design incentive / market force (KSR rationale F): flexible, lightweight, roll-up and conformable display demand (recited in both ’363 and Gustafsson) supplied an incentive to harden and moisture-seal the plastic stack.

Reasonable expectation of success

’715 empirically demonstrated the composite layer's barrier/hardness/bonding/transmittance properties on plastic, and ’363/Gustafsson demonstrated that flexible OLEDs on ITO/polyester survive repeated bending. Combining a proven coating stack with a proven flexible OLED was a matter of routine design with an expected success. The one apparent obstacle — thermal damage to the plastic/organic layers — is removed because ’715 recites deposition at room temperature by ion-assisted electron gun evaporation, which is exactly the low-temperature technique the ’805 claims also use.

5. Claim 14 — second independent claim

Claim 14 recites the same stack, differing by (i) calling the substrate-side layers "first/second luminescent efficiency enhanced layers" (a functional characterization) and (ii) requiring the encapsulant to be an "ion-assisted electron gun evaporated silicon dioxide protecting layer."

• The "luminescent efficiency enhanced layer" terminology is not a structural difference. ’715 expressly discloses the composite as a transmittance-enhanced layer that, "with appropriate components and thicknesses," enhances the optical performance of the transparent conductive electrode (see the Fig. 6 curves and discussion). Enhancing the ITO electrode's optical behavior to raise device luminescence is the same function, and "luminescent efficiency enhanced" is the natural functional label for that layer in an OLED.
• The ion-assisted electron gun evaporated SiO₂ limitation is squarely suggested: ’715 claim 2 recites "ion-assisted electron gun evaporation … at room temperature" for the composite layers, and ’715 discloses oxide overcoats including SiO₂. Applying the same disclosed deposition technique to the known encapsulant material SiO₂ is routine. Even if the process limitation is given product-by-process weight, the process step and material were both known, and the ’805 specification confirms the resulting SiO₂ layer is not structurally distinguishable (amorphous, 20–150 nm, dense).
• Antecedent-basis issue (from the summary): claim 14 recites "first/second luminescent efficiency enhanced layer" but then refers back to "the first composite layer" — a term never introduced in claim 14. For § 103 purposes this drafting defect points to the same structure as claim 1 with added functional/process language; it therefore rises or falls with the claim-1 combination.

Combination for claim 14: US 5,808,715 + US 5,844,363 (+ the inventors' own Opt. Eng. papers as evidence that the ion-assisted coevaporated composite/oxide process was the inventors' known technique).

6. Dependent claims 2–13, 15–18 — each obvious over the combination

7. Rebuttal considerations (what the patent owner would argue, and the counter)

1. "Different technical field — ’715 is LCD, not OLED."
   Counter: § 103 does not require identical fields; the references must be analogous, and both are thin-film display devices on plastic substrates sharing ITO electrodes and moisture/scratch/thermal-stress problems. The ’805 background itself draws on the LCD plastic-substrate art as the starting point.
2. "’715 uses a liquid crystal/alignment-layer stack not present here."
   Counter: In re Keller — the test is what the combined teachings suggest; bodily incorporation is not required. The ’715 undercoat/overcoat/ITO portion transfers cleanly.
3. "Unexpected results — the composite is amorphous with 2500 N/mm² hardness."
   Counter: ’715 already discloses the amorphous, chemically inactive, high-hardness composite; the ’805 specification concedes these are known properties of the composite, not newly discovered results attributable to the claimed invention.
4. "Teaching away — OLED organics cannot survive the sputtering/deposition needed for the coating."
   Counter: There is no teaching away; ’715 teaches the low-temperature (room-temperature) ion-assisted electron gun evaporation route, which avoids the thermal budget problem. Indeed, ’805's stated advantage (processing <100 °C) is achieved by the same technique ’715 discloses.
5. "The process limit (claim 14: ion-assisted electron gun evaporated SiO₂) imparts patentable character."
   Counter: Both the material (SiO₂) and the technique (ion-assisted e-gun evaporation) are disclosed in ’715; the resulting layer is not shown to differ structurally or in properties — a classic product-by-process problem.

I found no evidence in the record of unexpected results, copying, licensing-induced nexus, or industry praise tied to the claimed subject matter that would rebut the prima facie case. The commercial enforcement history (Cedar Lane) is not probative of non-obviousness.

8. KSR rationale summary

• Rationale A (combining known elements with predictable results): TiO₂–SiO₂ ion-assisted-evaporated composite layers (’715) + organic EL stack with ITO anode and metal cathode (’363, ’211, Gustafsson).
• Rationale F (design incentive / market force): flexible, lightweight, moisture-sealed, scratch-resistant displays.
• Rationale G (finite, predictable solutions): the ’715 composite is a known answer to the exact outgassing/adhesion/thermal-stress/scratch problems of plastic-substrate devices.

Bottom line: Claims 1 and 14, and dependent claims 2–13 and 15–18, would each have been obvious under § 103 over US 5,808,715 in view of US 5,844,363, further in view of US 4,885,211 and Gustafsson et al., and (for the process-flavored limitations) the inventors' own Opt. Eng. papers. The strongest primary combination is the closest prior art (’715, same assignee, same inventors) plus the flexible-OLED reference (’363), with the ’805 specification's own admissions supplying the motivation.

9. Caveats and things I could not verify

1. I could not confirm the full disclosure of US 5,909,081 (Idemitsu), US 6,228,514 (Sony), or US 6,235,414 (Ohio State) within budget; I therefore did not rely on them, though they are of record and could supply additional cathode/encapsulation or multi-color-OLED teachings.
2. My statement that ’363 discloses a full encapsulating protective layer is a characterization: ’363 discloses a metal protective layer (Ag) over the Mg–Ag cathode and reports devices operating unpackaged in air, and ’363 references Gustafsson and notes OLEDs are sensitive to atmosphere. If a challenger needs airtight "enclosure of the organic emitting layer," it should add a dedicated OLED-encapsulation reference (the field was replete with them by the 2000 priority date; the ’805 background admits the sensitivity). I flag this as the one element of claim 1 that is least directly met by a single reference of record.
3. This is a technical obviousness assessment, not a legal opinion, and the patent is expired (adjusted expiration 2021-06-08), so validity analysis today has historical/academic rather than injunctive significance. No PTAB proceeding naming this patent was confirmed in the earlier section.