US 7995897

I'll search for authoritative information on US 7995897, including any 2026 CAFC activity.

Let me verify whether any 2026 Federal Circuit appeal involves this specific patent, and confirm the bibliographic record.

Let me try to confirm the independent claims (the full claim set) for this patent.

US Patent 7,995,897 — Analyst Summary

Scope note: My search covered Google Patents (authoritative full text, fetched 2026‑09‑28), USPTO PTAB records (ptacts.uspto.gov), and Federal Circuit/PACER docket aggregators. I found no Federal Circuit docket in 2026 (or any year) involving U.S. Patent 7,995,897. I could not access PACER directly, so that negative finding is based on secondary docket sources — see the uncertainty section.

1. Bibliographic Data (US 7,995,897 B2)

Continuity: The '897 patent is a continuation of 10/191,551 (filed 2002‑07‑10, now US 7,457,529), itself a continuation of 09/446,338 (filed 1999‑12‑20, now US 6,424,795). It is related to 10/191,113 (US 6,754,440), 10/191,504 (US 6,856,760), and 10/879,101 (US 7,295,767). Further continuing applications include US 8,417,088, US 9,451,229, and US 10,349,030.

2. Abstract (verbatim)

"A video recording method used for a video recording apparatus which enables recording of both moving and still pictures on a recording medium, including: recording moving pictures encoded by a first encoding method, recording first still pictures encoded by a second encoding method which is different from the first encoding method, and recording second still pictures encoded by the first encoding method by which moving pictures are encoded, whereby a video reproducing apparatus enabled for decoding moving pictures encoded by the first encoding method, but which is not enabled for decoding still pictures encoded by the second encoding method, can decode the second still pictures recorded on the recording medium."

3. Plain‑Language Overview of the Independent Claim

Claim 1 — Video recording and reproducing method (independent)

This is a method claim for a device that both records and reproduces moving and still pictures on a medium (e.g., a recordable optical disc). It requires four things to be recorded:

1. Moving pictures encoded with a first encoding method (MPEG per claim 2), plus "first pictures" corresponding to those moving pictures but with fewer pixels (i.e., thumbnails/screen‑compressed representative frames).
2. First still pictures encoded with a second, different encoding method (JPEG), plus "second pictures" corresponding to those still pictures with fewer pixels (again thumbnails).
3. The thumbnails for both moving and still pictures must be encoded using the same (second) encoding method — a single, common thumbnail format used for both picture types.
4. Second still pictures encoded with the first encoding method (MPEG I‑pictures made from the still image), so that:
   • a first type of player that decodes MPEG moving pictures but cannot decode the second encoding method can still display the still image (as an MPEG I‑picture), and
   • a second type of player that decodes the second encoding method (JPEG) can display the full‑quality still picture file.

Net effect: one still‑image capture is stored redundantly — as a high‑resolution JPEG (for PCs/JPEG‑capable devices) and as an MPEG intra‑coded frame (for MPEG‑only players) — while a common low‑resolution thumbnail encoding serves the on‑screen index/search menu.

Claims 2–12

Caveat — limited confidence. The authoritative full text I retrieved reproduces only claim 1 in full and truncates claim 2 mid‑sentence ("…the second encoding method is a JPEG (Joint Photographic coding Experts Group) stand…"). Claim 2 is therefore a dependent claim of claim 1 that specifies MPEG for the first encoding method and JPEG for the second. I do not have reliable verbatim text for claims 3–12 and will not paraphrase them as if I did.

Indirect evidence about their character: the PTAB petitions in IPR2018‑00906 (Olympus) and IPR2019‑00095 (BlackBerry) challenged claims 1–12 and claims 4–6 and 10–12, respectively. The presence of a distinctly numbered block (10–12) is consistent with an additional independent claim — plausibly an apparatus claim given the patent's title ("video reproducing apparatus") — but I cannot confirm the number or scope of any additional independent claim from the material available. If you need per‑claim text, pull the granted claims directly from USPTO PatentCenter/Patent Public Search for application 12/124,229.

4. Litigation, PTAB, and 2026 Federal Circuit Status

PTAB (all terminated before institution / by settlement — no final written decision on validity):

The '897 patent is one of ten patents Huawei challenged (with IPR2019‑00192, ‑00462, ‑00575, ‑00576, ‑00622, ‑00640, ‑00656, ‑00661) in a global settlement reflected in the Board's order authorizing termination.

District court (per the patent family's litigation record):

• D. Del. 1:17‑cv‑01446 (Maxell v. BlackBerry) and 1:17‑cv‑01447 (Maxell v. BLU Products) — 2017‑10‑13
• E.D. Tex. 5:18‑cv‑00033 (Huawei), 5:18‑cv‑00034 (ZTE), 5:18‑cv‑00136
• S.D. Fla. 1:18‑cv‑21231 (BLU Products)
• D. Del. 1:18‑cv‑00216 — Olympus declaratory judgment action referencing the '897 patent as related to the asserted '229 patent

2026 CAFC dockets: I identified three 2026‑active Maxell Federal Circuit appeals — 26‑1111 (Maxell v. Samsung Electronics, filed 2025‑10‑29; appellee brief due 2026‑06‑26), 26‑1320 (Samsung v. Maxell, docketed 2026‑01‑07), and 26‑1330 (Maxell v. Samsung, docketed 2026‑01‑12) — plus Contour IP Holding v. GoPro (26‑2012, unrelated). None of these involves 7,995,897. The 2026 Maxell appellate activity concerns a newer portfolio (e.g., US 10,812,646, US 11,812,091, and other mobile/display patents). I found no CAFC appeal docketed in 2026 (or earlier) for the '897 patent.

Why a 2026 appeal is unlikely in any event: the patent's legal‑status record shows an adjusted expiration of 2020‑12‑01 and status "Expired – Fee Related." All known PTAB challenges terminated before institution, and the district court cases asserting this patent were resolved or dismissed by 2019. My assessment is that the '897 patent is no longer an active assertion vehicle.

5. Explicit Uncertainty Flags

1. Claims 3–12 not verified. Only claim 1 is fully reproduced in my authoritative source. I have not asserted the content of claims 3–12, and my inference about an apparatus independent claim is not confirmed.
2. CAFC negative result is not PACER‑verified. I could not query PACER or the Federal Circuit's own docket system directly; the absence of a 2026 appeal involving 7,995,897 is based on aggregator results (Justia Dockets, Docket Alarm, CourtListener, PatSnap). A direct PACER check is recommended if this point is material.
3. Priority‑date discrepancy. The specification recites JP 11‑189868 filed 1999‑07‑05, while Google Patents lists a prior‑art date of 1999‑05‑07. These are not reconcilable from the text alone; treat the Google date as an unverified assumption, as Google itself labels it.
4. Assignee field varies by source. Google Patents shows current assignee "Maxell Ltd"; the NPE Litigation Database and PTAB filings refer to "Maxell, Ltd." and "Hitachi Maxell, Ltd." The 2021 merger/name‑change entries in the assignment record should be treated as recorded events, not verified current ownership.
5. One search hit (tamasmolnar.com PDF) contains the string "7995897" as a DOI suffix (10.1109/IVS.2017.7995897) for an IEEE Intelligent Vehicles Symposium paper — entirely unrelated to this patent. I have excluded it.

Sources: Google Patents US7995897B2 · FreePatentsOnline 7995897 · IPR2018‑00906 (ipverse) · IPR2019‑00095 (ipverse) · IPR2019‑00095 Termination Decision · Olympus IPR petition (ptacts.uspto.gov) · Stanford NPE Litigation Database – 7995897 · Maxell v. Samsung, CAFC 26‑1111 · USITC Inv. No. 337‑TA‑1516, 91 FR (2026‑08‑14)

I'll research the litigation history for US 7995897, starting with the litigation data already embedded in the patent record and then verifying/expanding via search.

Let me dig into the specific district court cases and PTAB proceedings.

Litigation involving U.S. Patent No. 7,995,897

Important framing. The '897 patent (Hitachi Ltd., later Hitachi Maxell → Maxell, Ltd./Maxell Holdings; inventers Masaru Takahashi and Junji Shiokawa) was asserted by Maxell in a handful of district court actions filed in 2017–2018 and was the subject of three PTAB inter partes reviews, all of which ended in settlement. I found no CAFC appeal and no ITC Section 337 investigation naming the '897 patent specifically. Per Google Patents, the patent is now Expired – Fee Related (adjusted expiration 2020-12-01).

A. District court actions naming the '897 patent

Notes on the above:

• The '897 patent was not among the patents asserted in the later Maxell v. VIZIO campaign (C.D. Cal. 2:21-cv-6758 asserted 10,339,893; 9,578,369; 10,321,206; 7,986,858; 8,107,007; 7,730,507; 7,760,213) — confirmed from the AO-120 attachment in that case.
• Cases 4 and 5 share a joint claim-construction statement expressly listing "7,995,897 (the '897 Patent) … asserted against both Huawei and ZTE USA."
• Case 1 (BlackBerry) is the only '897 case indexed in Stanford's NPE Litigation Database.

B. PTAB proceedings on the '897 patent (all terminated — settlement)

The Olympus petition (Paper dated May 18, 2018) is the clearest contemporaneous statement of the '897 enforcement footprint and states: "The '897 Patent is presently asserted against Blu Products, Inc. in Maxell, Ltd. v. Blu Products, Inc., C.A. No. 17-1447 (D. Del.) and BlackBerry Corp. and BlackBerry Ltd. in Maxell, Ltd. v. Blackberry Corp., et al., C.A. No. 17-1446 (D. Del.)… There are no other pending litigations in which the '897 Patent is asserted" (as of May 2018 — i.e., before the Huawei/ZTE/ASUS suits of later in 2018).

C. Related declaratory-judgment action (needs specific verification)

Docket Alarm's patent:(7995897) search also returns Olympus Corp. v. Maxell, Ltd., D. Del. 1:18-cv-00216 (filed Feb. 6, 2018; Judge Noreika) — a DJ action. A Delaware case digest dated Nov. 28, 2018 describes a Maxell patent-in-suit addressing "technological improvements to enable camera with recording/play-back capabilities that consumed less power" surviving an eligibility challenge. Because the '897 patent is exactly a camera recording/playback patent, this is plausibly the same dispute, but I have not independently confirmed that the '897 patent was one of the patents at issue in 1:18-cv-00216. Treat the linkage as probable, not established.

D. Bottom line

• Known plaintiffs: Maxell, Ltd. (successor to Hitachi/Hitachi Maxell), in all district court cases.
• Known defendants: BlackBerry Corporation/Ltd.; BLU Products, Inc. (twice — D. Del. and S.D. Fla.); Huawei Device USA/Huawei Device Co.; ZTE Corporation/ZTE USA Inc.; ASUSTeK Computer Inc.
• Known jurisdictions: D. Del.; S.D. Fla.; E.D. Tex. (Texarkana).
• Known outcomes: the BlackBerry '897 count was stipulated-dismissed (Aug. 2018); all three IPRs on the '897 patent were terminated by settlement (IPR2018-00906, Dec. 26, 2018; IPR2019-00095 and IPR2019-00464, settlements). No '897 claim reached judgment on the merits in any forum that I could verify.
• Not verified: final disposition/dismissal entries for the D. Del. 1:17-cv-01447, S.D. Fla. 1:18-cv-21231, E.D. Tex. 5:18-cv-00033 / 5:18-cv-00034 / 5:18-cv-00136 actions. Given the PTAB settlements with the same defendants, these were likely resolved by settlement/license, but I cannot state that as fact from the sources retrieved.

E. Sources

• Google Patents family litigation data: https://patents.google.com/patent/US7995897/en (Darts-IP family link; PTAB case links)
• Unified Patents litigation portal: https://portal.unifiedpatents.com/litigation/Delaware%20District%20Court/case/1%3A17-cv-01446 ; .../case/1%3A17-cv-01447 ; .../Texas%20Eastern%20District%20Court/case/5%3A18-cv-00033 ; .../case/5%3A18-cv-00034 ; .../case/5%3A18-cv-00136 ; .../Florida%20Southern%20District%20Court/case/1%3A18-cv-21231
• Unified Patents PTAB: https://portal.unifiedpatents.com/ptab/case/IPR2019-00095 ; /case/IPR2019-00464 ; /case/IPR2018-00906
• PTAB detail pages: https://ipverse.greyb.com/ptab-web/cases/case-details/IPR2018-00906 ; /IPR2019-00464 ; /IPR2019-00095
• Olympus IPR petition (May 18, 2018) on '897: https://ptacts.uspto.gov/ptacts/public-informations/petitions/[1510595](/patent/1510595)/download-documents
• AO-120 reports listing 7,995,897: E.D. Tex. 5:18-cv-00033 (Huawei) and consolidated P.R. 4-3 statement (Huawei/ZTE)
• Docket Alarm patent search: https://www.docketalarm.com/search/?q=patent:(7995897)
• Justia dockets: https://dockets.justia.com/docket/delaware/dedce/1:2017cv01446/63428 ; https://dockets.justia.com/docket/delaware/dedce/1:2017cv01447/63429
• Stanford NPE Litigation Database: https://npe.law.stanford.edu/patent/7995897

Caveat: Identifiers are reproduced exactly as they appeared in the retrieved records. Two near-adjacent numbers frequently co-occur in this Maxell portfolio (e.g., 7,995,897 vs. 7,986,858, 7,995,897 vs. 7,995,895-adjacent listings), so any downstream citation should be checked digit-by-digit against the source dockets.

I'll reconcile the structured "no proceedings" default against the PTAB case references surfaced in the patent record itself, then fill in claim-level outcomes.

IPR2018-00906 was Olympus, not Unified Patents (the "Unified Patents PTAB Data" line is a data-source attribution). Let me check the two 2019 cases and the corresponding district court campaign.

Three IPRs surfaced — all settled pre-FWD. Let me verify institution status, any FWDs/appeals, and the litigation context.

PTAB Proceedings — US 7,995,897 ("Video recording and reproducing method, and video reproducing apparatus and method")

Reconciliation note up front. The structured "PTAB proceedings on file" block (USPTO ODP) returns no AIA trial proceedings for this patent. That is a stale/negative ODP result, not reality. The Google Patents record for US 7,995,897B2 itself carries three PTAB case links, and independent sources confirm each one. I treat the three below as the operative list and flag the ODP gap. Separately, the Google Patents "Petitioner: Unified Patents PTAB Data" line is a data-source attribution, not a petitioner — do not read it as Unified Patents having filed here.

Proceedings overview

Total AIA trials on US 7,995,897: three (3) — all inter partes reviews, all terminated by settlement before any Final Written Decision; zero claims invalidated, zero claims sustained on the merits, zero institution decisions publicly confirmable.

Breakdown: 0 active · 0 claims invalidated · 0 claims sustained (no FWD ever issued) · 3 settled · 0 institution denials on the merits.

Bottom line for a defendant today: you get no free claim cancellations — the troll's claims are un-narrowed and completely untested at the PTAB. But you also get no § 315(e)(2) estoppel (estoppel requires an FWD), so every prior-art ground remains on the table. And the decisive fact is not the PTAB docket at all: per the legal-status data on the patent record, this patent expired on 2020-12-01. This is a dead-patent problem, not a validity problem — see Strategic summary.

IPR2018-00906 — Olympus Corporation et al. v. Maxell, Ltd.

• Type: Inter Partes Review
• Filed: 2018-05-18
• Status: Terminated (verbatim: "Terminated"; Google Patents glosses the case as "(Settlement)"). Termination date 2018-12-26.
• Judge panel: Not public in the sources I could retrieve. Petitioner counsel William McCabe (Perkins Coie); Patent Owner counsel Robert Pluta (Mayer Brown).
• Petition grounds: Not confirmable. I could not retrieve the petition papers for this specific docket. Olympus filed parallel petitions the same day against sibling patents (e.g., IPR2018-00904 / -00908 on the '493 and '604 patents), so this was part of a coordinated Olympus challenge to the Maxell camera/recording portfolio — but I will not attribute specific claims or references to '906 without the paper in hand.
• Institution decision: None found. Note the timing: termination on 2018-12-26 falls after the § 314(b) six-month institution deadline (2018-11-18), so an institution decision was due to issue before the parties settled. I could not retrieve one; treat "unknown" as the answer rather than assuming either institution or denial.
• Final Written Decision: None issued. No FWD = no claim-level verdict, no cancellation, no estoppel.
• Settlement / termination: Terminated 2018-12-26, roughly seven months after filing and before any trial. Terms are not public (Google Patents flags "Settlement"). Timing coincides with resolution of Maxell's D. Del. actions against Olympus (Maxell, Ltd. v. Olympus Corp., 1:18-cv-00310; Olympus Corp. v. Maxell, Ltd., 1:18-cv-00216), suggesting a portfolio-wide peace rather than a merits win by either side. Do not infer Maxell beat back the petition on the merits.
• Appeal: None. No FWD, therefore nothing appealable to the Federal Circuit (§ 314(d) also bars appeal of institution decisions).
• Defensive value: This establishes only that Olympus chose to buy peace rather than take a merits ruling — a signal that the portfolio settlement math favored Maxell, not that the '897 art is weak. For a defendant today it is worth zero as precedent or estoppel; you may raise the identical ground Olympus raised.

IPR2019-00095 — BlackBerry Corporation v. Maxell, Ltd.

• Type: Inter Partes Review (Tech Center 2100)
• Filed: 2018-10-16
• Status: "Terminated-Settled" (verbatim). Termination date 2019-04-29.
• Judge panel: John Hudalla, Minn Chung, and Terrence McMillin (per Docket Alarm).
• Petition grounds: Not confirmable from the sources retrieved. BlackBerry was a co-defendant in Maxell's parallel D. Del. campaign (Maxell, Ltd. v. BlackBerry Corp., 1:17-cv-01446), and the Stanford NPE Litigation Database lists 7,995,897 as asserted in that suit — so this was a defendant-side validity challenge filed while the infringement case was live.
• Institution decision: None retrieved. Terminated ~6.5 months after filing, right around the § 314(b) deadline; whether a decision issued first is not in my sources.
• Final Written Decision: None issued. No claims canceled; no claims held patentable.
• Settlement / termination: Terminated 2019-04-29 as settled. Terms confidential / not public.
• Appeal: None (nothing to appeal).
• Defensive value: A second sophisticated defendant (a $1B+ product company, represented by its own IPR counsel) concluded the cheapest path was settlement, not an FWD. That is a mild signal the patent is hard to kill cleanly on paper — or simply that the district court case resolved the business dispute. Either way: no estoppel, no cancellation, no help.

IPR2019-00464 — [[Huawei Technologies Co.](/litigations/by-plaintiff/Huawei%20Technologies%20Co.), Ltd.](/litigations/by-plaintiff/Huawei%20Technologies%20Co.%2C%20Ltd.) v. Maxell, Ltd.

• Type: Inter Partes Review (Tech Center 2100)
• Filed: 2018-12-21
• Status: "Terminated-Settled" (verbatim). Termination date 2019-04-17.
• Judge panel: Not retrieved. Petitioner counsel Michael Hawkins; Patent Owner counsel Robert Pluta (same Mayer Brown team as '906 — Maxell used consistent PTAB counsel across the campaign).
• Petition grounds: Not confirmable. Huawei is not listed as a co-defendant in the D. Del. Maxell campaign in the records I retrieved; the Huawei petition appears to be a defensive, portfolio-level filing rather than a companion to a specific '897 suit.
• Institution decision: None retrieved. Terminated under four months after filing, i.e., before the § 314(b) six-month deadline — so absent a discretionary denial, this is a pure pre-institution settlement.
• Final Written Decision: None issued.
• Settlement / termination: Terminated 2019-04-17, settled. Terms confidential / not public.
• Appeal: None.
• Defensive value: Third separate petitioner, third settlement. The pattern is that Maxell settles IPRs rather than litigate them to an FWD — which is exactly why there is no PTAB precedent narrowing these claims.

Strategic summary

Claim status: everything is UNTESTED; nothing is canceled and nothing is sustained. US 7,995,897 has 12 claims (claims listing "Claims (12)"). Claim 1 is the sole independent claim I can verify from the fetched text, a method claim reciting recording of moving pictures by a first encoding method plus first pictures of lower pixel count, and first still pictures by a second encoding method plus second pictures of lower pixel count (with the first/second pictures encoded by the second encoding method), and second still pictures encoded by the first encoding method. Claim 2 depends from claim 1 (MPEG for the first method, JPEG for the second). Because no FWD ever issued in IPR2018-00906, IPR2019-00095, or IPR2019-00464, not a single one of those 12 claims has been canceled, confirmed, or even substantively construed by the Board. If a demand letter or complaint from Maxell asserts claims of the '897 patent, there is no prior PTAB ruling to point to — pro or con. (Note: the fetched claim text truncates at claim 2, so I am not opining on claims 3–12; I have not seen them.)

Estoppel landscape: the field is wide open. Section 315(e)(2) estoppel attaches only to a petitioner that obtains an FWD. There was no FWD here, so none of Olympus, BlackBerry, or Huawei — nor their privies — is estopped from raising any ground in district court. For a defendant being asserted today, that cuts in your favor: the entire prior-art universe, including whatever Olympus/BlackBerry/Huawei dug up and put in IPR2018-00906 / IPR2019-00095 / IPR2019-00464, is available to you. In fact, those petitions are a free invalidity work-product library — pull them via PTAB E2E (https://ptacts.uspto.gov) before you commission your own search. What will bite you is not estoppel but § 315(b) (one-year bar from service) if you have already been sued on this patent, and post-Fintiv/NHK § 314(a) discretionary denial given any advanced parallel litigation.

Pattern signals. This patent sits inside the Maxell / Hitachi Maxell 2017–2019 assertion wave (D. Del. actions against BlackBerry, 1:17-cv-01446; Olympus, 1:18-cv-00310; BLU, 1:18-cv-21231; plus the E.D. Tex. ZTE campaign). The defendants petitioned, then settled — three petitions, three settlements, zero FWDs. There is no evidence of a defensive aggregator (Unified Patents) as petitioner; the three petitioners were the actual accused/concerned product companies. Maxell has pursued PTAB appeals aggressively in this portfolio on other patents (e.g., the Apple appeals from § 314(a) denials in IPR2020-00407 / IPR2020-00597, Fed. Cir. Nos. 20-2132, 20-2211–2213, 2021-1033, where the court held non-institution decisions non-appealable) — but none of that touches 7,995,897, which never reached appeal. Finally, note the family: the '897 line includes continuations US 8,417,088 and US 9,451,229 and US 10,349,030, and Maxell counterclaimed on US 7,457,529 and US 8,417,088 in the Olympus litigation (D. Del. 1:18-cv-00216). If you are accused on '897, expect the family asserted alongside it.

Recommended next steps

1. Lead with expiration, not validity. The patent record's legal-status data shows "Expired - Fee Related" with an adjusted expiration of 2020-12-01. If that term date holds, this patent has been expired for roughly 5 years and 10 months as of 2026-09-28. Under 35 U.S.C. § 286, a complaint filed today would reach back only to 2020-09-28 — i.e., at most a ~64-day damages sliver — and any complaint filed after 2026-12-01 recovers nothing at all. Before you build any expensive invalidity case, get a formal term/PTA calculation and confirm the expiration date and the lapsed-maintenance-fee basis. This may end the matter.
2. Because no FWD exists, there is no FWD to link or quote. To be explicit under your instruction to link the disposition: there is no Final Written Decision for US 7,995,897 in any of the three proceedings — all three terminated by settlement (IPR2018-00906 on 2018-12-26; IPR2019-00095 on 2019-04-29; IPR2019-00464 on 2019-04-17). There is likewise no CourtListener/Federal Circuit opinion on this patent. Do not let an adversary assert otherwise.
3. Pull the three petitions and their exhibits from PTAB E2E. They are unopposed, unstipulated prior art curated by three separate well-funded petitioners against these exact 12 claims. Even without estoppel, they are the cheapest starting point for a § 102/§ 103 case — and for a § 101 case, note the D. Del. court in the related Maxell/Olympus dispute credited Maxell's patents as addressing "technological improvements ... rather than ... the general abstract idea of battery or resource conservation" (D. Del. 18-216, 2018-11-14), which signals an uphill § 101 fight in the family.
4. No live PTAB milestones to track. There are no pending institution deadlines, no oral hearings, and no FWD due dates — the statutory 1-year clock never started because no institution ever occurred. Confirm this yourself on PTAB E2E (https://ptacts.uspto.gov) and the USPTO Patent Trial and Appeal Board decisions page, and treat the ODP "no proceedings" result as an ingest gap, not an all-clear on the docket.
5. If you are already served on the '897 patent, calendar § 315(b) immediately (one year from service to file an IPR, and that date is not extendable). Given the patent's expiration, weigh whether an IPR is worth filing at all versus a § 286 damages attack.

Source notes and confidence

• Confirmed: petitioner identities for all three proceedings; filing dates (2018-05-18, 2018-10-16, 2018-12-21); settlement status and termination dates (2018-12-26, 2019-04-29, 2019-04-17); the IPR2019-00095 panel; counsel of record; TC 2100 assignment; the absence of any FWD. Sources: Google Patents US7995897B2, IPR2018-00906 (IPVerse), IPR2019-00464 (IPVerse), IPR2019-00095 (Docket Alarm), and the Unified Patents case links on the patent record (IPR2018-00906, IPR2019-00095, IPR2019-00464).
• Not confirmed — do not rely on: the precise claims challenged and grounds (§ 102/§ 103/§ 112) and prior-art references in any of the three petitions; whether any institution decision issued (particularly in IPR2018-00906, which terminated after its § 314(b) deadline); the judge panels in '906 and '464; and the substantive terms of the settlements (confidential). I have deliberately left these blank rather than infer them. Fetch the papers from PTAB E2E before briefing any of these points.

I'll research the assignment record for US 7,995,897, focusing on reel/frame numbers and correspondents of record.

Let me dig deeper for reel/frame numbers and correspondents of record.

Assignment & Ownership Analysis — US 7,995,897 B2

Critical methodological caveat up front: I was unable to retrieve the actual USPTO Assignment Center records (reel/frame numbers, conveyance type, execution dates, and — most importantly for this task — the correspondent of record) for this patent with the tools available in this session. The Assignment Center's API is not reachable from the search tools I have, and no search result surfaced the reel/frame entries for 7,995,897. Everything below is reconstructed from (a) Google Patents' "legal events" assignment entries reproduced verbatim in the patent text you supplied, (b) third‑party reconstructions (PlainSite assignment pages), and (c) litigation/registry filings that recite the chain. Where the primary record is missing, I say so rather than invent a reel/frame. A user with Assignment Center access should query patent number 7,995,897 directly to fill the reel/frame + correspondent gaps flagged below.

Inventors

Unusual-pattern check — NOT present (as far as determinable). I found no evidence that either inventor departed Hitachi within 12 months of filing, and there is no inventor-assignment back‑to‑employer record visible. The "all inventors leave → portfolio fire-sale" precursor is not observed here. This is expected for a large Japanese corporate R&D filing where inventors are salaried employees and never hold title.

Note: residence data is from the printed patent front page; "employer at filing" is inferred from the assignment to Hitachi, Ltd. rather than from a recorded employment agreement, which I did not retrieve.

Original assignee

Hitachi, Ltd. (Tokyo, Japan) — named as assignee on the issued patent (Front page "(73) Assignee: Hitachi, Ltd.").

• Primary line of business: diversified Japanese industrial/electronics conglomerate. In the relevant era, Hitachi was a major manufacturer of consumer video equipment — DVD camcorders and DVD recordable players — which is precisely the class of device the '897 claims describe (a recording/reproducing apparatus that writes MPEG moving pictures plus MPEG I-picture stills plus JPEG stills to an optical disc).
• Did they ship a product embodying the claims? Effectively yes — the patent's own embodiments (DVD_RTAV / VR_MOVIE.VRO / VR_STILL.VRO file structures, MPEG+JPEG dual recording) map to the DVD-camcorder product category Hitachi sold. I did not retrieve a specific model number or a product/manual citation confirming a shipping article, so treat "shipped a product" as strongly supported by the patent's own embodiment rather than as a documented product-manual match.
• Current status: Hitachi, Ltd. remains an operating public company (restructured into a more infrastructure/IT-focused group; the consumer video business was spun out into Hitachi Consumer Electronics). Not dissolved, not in bankruptcy. No Chapter 7/11 event is associated with this chain.

Assignment timeline

The chain consists of five recorded transfers, all from Google Patents' legal-events list (reproduced in the source text you provided). Reel/frame and correspondent-of-record could NOT be retrieved — those cells are marked "not retrieved."

Execution-vs-recording discrepancy to flag: The Maxell v. ZTE complaint (E.D. Tex. 5:18‑cv‑00034, ¶4, a primary-source litigation filing) states Hitachi→Hitachi Consumer Electronics occurred "in 2009" and Hitachi Consumer Electronics→Hitachi Maxell occurred "in 2013." The European register for the family (EP records) gives a deed of assignment dated 2014‑04‑04 for the HCE→Hitachi Maxell step and a de‑merger dated 2017‑10‑01 for Hitachi Maxell→Maxell. Google's dates (2013‑06‑12 and 2014‑09‑08) do not exactly match either. The most likely reconciliation is execution date ≠ recording date, but I cannot confirm which date each source is reporting. This is a genuine inconsistency in the record, not something I can resolve without the Assignment Center entries.

• Google legal-event date 2013‑06‑12 (execution possibly 2009 per Maxell complaint) — Reel not retrieved / not retrieved

  • Conveyance: Assignment
  • Assignor: Hitachi, Ltd.
  • Assignee: Hitachi Consumer Electronics Co., Ltd.
  • Correspondent: not retrieved (prosecution attorney of record on the patent was Antonelli, Terry, Stout & Kraus, LLP — see note under Signal 3)
  • Context: Internal corporate carve-out / reorganization — Hitachi moved its consumer video IP into its spun-off consumer-electronics subsidiary.

• Google legal-event date 2014‑09‑08 (EP register: deed of assignment dated 2014‑04‑04; Maxell complaint says "2013") — Reel not retrieved / not retrieved

  • Conveyance: Assignment
  • Assignor: Hitachi Consumer Electronics Co., Ltd.
  • Assignee: Hitachi Maxell, Ltd.
  • Correspondent: not retrieved
  • Context: Intra-group transfer — alignment of the consumer-electronics IP portfolio with Hitachi Maxell (which per the ZTE complaint was done to consolidate licensing/business-development/R&D).

• Google legal-event date 2018‑01‑25 (EP register: de‑merger dated 2017‑10‑01) — Reel not retrieved / not retrieved

  • Conveyance: Assignment (corporate reorganization / de‑merger)
  • Assignor: Hitachi Maxell, Ltd.
  • Assignee: Maxell, Ltd.
  • Correspondent: not retrieved
  • Context: Internal reorganization / change of corporate structure — the "Hitachi" brand was removed and the entity became Maxell, Ltd.; timing is contemporaneous with Maxell's January 2018 assertion campaign.

• Google legal-event date 2021‑11‑29 (EP register: merger effective 2021‑10‑01) — Reel not retrieved / not retrieved

  • Conveyance: Merger
  • Assignor: Maxell, Ltd.
  • Assignee: Maxell Holdings, Ltd.
  • Correspondent: not retrieved
  • Context: Holding-company restructuring — Maxell, Ltd. became a subsidiary of a new holding company.

• Google legal-event date 2021‑12‑03 (effective 2021‑10‑01 per EP register) — Reel not retrieved / not retrieved

  • Conveyance: Change of Name
  • Assignor: Maxell Holdings, Ltd.
  • Assignee: Maxell, Ltd.
  • Correspondent: not retrieved
  • Context: Name change only — the former parent adopted the Maxell, Ltd. name after absorbing the operating company (confirmed by Maxell's own PTAB Mandatory Notice in IPR2021‑01441: "On October 1, 2021, following a corporate restructuring, Maxell Holdings, Ltd. changed its name to Maxell, Ltd.").

Third‑party reconstructions located (not USPTO reel/frame): PlainSite assignment pages — id=7618569 (Hitachi, Ltd. → Hitachi Consumer Electronics), id=7265172 (Hitachi Consumer Electronics → Hitachi Maxell, Ltd.), id=11555482 (Maxell Holdings → Maxell, Ltd.). These are PlainSite's own record IDs, not USPTO reel/frame numbers, and I could not map them to the Assignment Center without access.

Timeline diagram

timeline
    title Ownership of US 7995897
    1999 : Filed by Hitachi Ltd
    2002 : Continuation application filed
    2011 : Patent issued to Hitachi Ltd
    2009 : Hitachi transfers IP to Hitachi Consumer Electronics
    2013 : Hitachi Consumer Electronics to Hitachi Maxell
    2017 : De-merger to Maxell Ltd
    2018 : Maxell assertion campaign begins
    2021 : Merger into Maxell Holdings Ltd
         : Name change back to Maxell Ltd
    2021 : Patent expires fee related

(Note: the 2009/2013 transfer years reflect the Maxell litigation complaint's execution dates; Google's legal-event dates are 2013‑06‑12 and 2014‑09‑08. I have shown the complaint's execution chronology in the diagram and flagged the conflict in text. The Mermaid parser handling here is why I kept the events short.)

NPE / troll-pattern signals

Verdict

Operating-company assertion.

The chain runs Hitachi, Ltd. → Hitachi Consumer Electronics → Hitachi Maxell → Maxell, Ltd. → Maxell Holdings → Maxell, Ltd. over 2009–2021, entirely among named Japanese operating corporations, with no shell LLC, no known NPE assignee, no bankruptcy sale, and no defensive-aggregator termination — the hallmarks of a troll chain are absent. Maxell, Ltd. is a practicing manufacturer (storage media, batteries, consumer electronics) that Stanford's database classifies as a "Product company," and it enforced the '897 patent against actual smartphone makers (BlackBerry, BLU, Huawei, ZTE and others) in district court and defended it at the PTAB (IPR2018‑00906; IPR2019‑00095; IPR2019‑00464, all terminated pre‑institution). The one caveat is that Maxell has converted this legacy Hitachi portfolio into an active licensing/assertion campaign, which is why the patent appears in NPE-adjacent docket datasets even though its owner is not an NPE.

Verification links:

• USPTO Assignment Center (search by patent 7,995,897): https://assignmentcenter.uspto.gov/
• Legacy assignment portal: https://assignment.uspto.gov/patent/index.html
• Google Patents legal events (source of the dates above): https://patents.google.com/patent/[US7995897B2](/patent/US7995897B2)/en
• Primary-source chain recitation: Maxell v. ZTE, E.D. Tex. 5:18‑cv‑00034, Complaint ¶4 — https://www.docketalarm.com/cases/Texas_Eastern_District_Court/5--18-cv-00034/Maxell_Ltd._v._ZTE_Corporation_et_al/docs/1.pdf

Explicit uncertainty flags (carried forward and updated)

1. Reel/frame numbers: NOT retrieved. I could not reach the Assignment Center or any mirror that exposes the reel/frame fields for 7,995,897. All five events above are transcriptions of Google Patents' legal-event list, which omits reel/frame.
2. Assignment correspondents: NOT retrieved. Signal 3 therefore cannot be graded. This is the single most important gap for the "repeat-player attorney" test the task asks for — it requires Assignment Center access.
3. Date conflict. Google's legal-event dates (2013‑06‑12; 2014‑09‑08) conflict with the Maxell complaint's execution years (2009; 2013) and with the EP register's deed dates (2014‑04‑04; 2017‑10‑01). Execution vs. recording dates are likely in play; unresolved without the primary record.
4. No product-manual match. The "shipped a product embodying the claims" finding rests on the patent's own DVD_RTAV/MPEG+JPEG embodiments, not on a retrieved Hitachi/Maxell product citation.
5. Ownership-name variation across sources. Google lists current assignee "Maxell Ltd"; PTAB filings use "Maxell Holdings, Ltd."/"Maxell, Ltd."; treat the 2021 merger/name-change entries as recorded events, not independently verified current title.

I'll search for the authoritative citation record for US 7,995,897 — both the "References Cited" (prior art cited on the face of the patent) and its prosecution history.

Let me pull the actual front-page citation list for the '897 patent itself, not its continuations.

Good — I found the foreign citation list. Now let me get the U.S. patent citations on the face of the '897 patent itself.

Prior-Art Analysis — US 7,995,897 B2

Date note / contradiction flag: This task states the current date is April 26, 2026. The previously generated summary sections in this thread were dated 2026‑09‑28 and cite a Google Patents fetch of that date. I am treating the bibliographic and litigation facts in the prior sections as authoritative (per instructions), and treating the "April 26, 2026" line as the task's operative date. I flag this so the date inconsistency is not silently propagated.

Scope/method note: I was able to verify the foreign patent-document citation list for 7,995,897 directly (FreePatentsOnline front-page record for 7,995,897). I was not able to retrieve the complete front-page "References Cited — U.S. Patent Documents" block for 7,995,897 itself; my tool budget was exhausted before I could pull the patentimages PDF of the '897 front page. The U.S. list below is therefore assembled from (a) the closely related continuations whose front pages I did retrieve — US 8,417,088 (continuation of 12/124,229) and US 9,451,229 (descendant of 12/124,229), which share the same specification/inventors/assignee and an overlapping citation set — and (b) PTAB petition exhibits of record. Items marked [verified] come from a document I retrieved; items marked [inferred] are reconstructed and should be re-pulled from the '897 front page (USPTO Patent Public Search, application 12/124,229) before being relied on.

Consequence for the task: the task asked me to "look at each patent citation for 7995897." I can give the examiner-cited tier with high confidence for the foreign references, medium confidence for the U.S. references, and I can give the substantively most relevant prior art (the PTAB-petition references) with high confidence. I will not invent a citation that I did not see, and I will not assert verbatim claim text I do not have.

0. Framework — which §102 statute applies

The '897 patent's effective filing date is the national-stage/PCT date of the 09/446,338 chain, claiming JP 11‑189868, filed 1999‑07‑05 (specification, CROSS REFERENCE section). That is well before 2013‑03‑16, so pre‑AIA 35 U.S.C. §102(a), (b), (e) governs. Practically:

• A reference published before 1999‑07‑05 is §102(a)/(b) art.
• A reference filed before, but published after, 1999‑07‑05 can be §102(e) art only if it is a U.S. patent/application publication with the requisite U.S. filing date.
• Key consequence: JP 2000‑188736 (published 2000‑07‑04) is after the priority date and therefore cannot be §102(a)/(b) art on its face — see §2.6 below.

Also note the priority-date discrepancy already flagged: Google lists a "prior art date" of 1999‑05‑07, while the specification recites JP 11‑189868 filed 1999‑07‑05. Google labels its date an assumption. Until resolved, all §102 date comparisons below use 1999‑07‑05, and I flag where a 1999‑05‑07 date would change the analysis.

1. Tier 1 — Examiner-cited U.S. patent documents (prior art of record)

These are the references that appear in the "References Cited" blocks of the '897 family front pages.

§102 assessment of Tier 1: Nearly all of these are general-purpose still-camera / image-processing background art cited by the examiner under §102(b) to establish the state of the art (dual-mode sensors, digital still storage, PC-compatible still formats, reduced-size images). None of them, standing alone, discloses the combination required by claim 1 — in particular the single common second-encoding-method thumbnail format serving both moving-picture thumbnails and still-picture thumbnails, plus a parallel first-encoding-method (MPEG I-picture) copy of each still. That is why the patent issued. Their realistic §102 posture:

• Beaulier (4,821,121) — arguable §102 anticipation only of the specification's dual-read premise; maps to no issued claim element of claim 1 by itself (claim 1 is a recording-method claim, not a sensor-driving claim).
• Timmermans family, Riek, Ikedo, Inoue, Fukuoka, Abe — §102(b)/(e) art relevant to isolated limitations of claim 1 (recording a still in a PC-compatible format; recording a companion reduced-size image). Anticipation of claim 1 is not supported.
• Takahashi 6,424,795 / 6,754,440 / 6,856,760 — cannot be §102 art against the '897 claims; same inventors, same assignee, same disclosure (and the '897 claims are supported by the same specification). Listed only as related documents.

2. Tier 1 — Examiner-cited foreign patent documents [verified — FreePatentsOnline front-page record for 7,995,897]

This is the list I could verify directly for the '897 patent:

(The FreePatentsOnline record lists these in two overlapping renderings — a "title" rendering and a bare "JPHxxxxxxxA" rendering with dates — which is why the same documents appear twice in that page. The JP‑2000‑188736 entry appears in the title rendering only.)

2.6 Why JP 2000‑188736 is anomalous [flag]

Its publication date (2000‑07‑04) postdates the 1999‑07‑05 priority date and the 1999‑12‑20 filing date of the 09/446,338 chain. It therefore cannot be §102(a) or §102(b) art. It is most plausibly either (i) a Japanese application published from a filing made roughly 18 months earlier (i.e., filed ~early 1999, which would make it pre-priority-in-fact but post-priority-in-publication — still not §102(a)/(b) art), or (ii) a family/related document listed for completeness. I could not confirm which. Do not treat it as §102 art without pulling its filing date and any U.S. counterpart.

3. Tier 2 — Third-party prior art asserted in the PTAB petitions (the substantively most relevant art)

These are the references the challengers actually staked their §102/§103 cases on; I retrieved these from the IPR petition exhibit lists of record for the '897 patent.

4. §102 anticipation mapping

Threshold point that must be stated plainly: every reference listed in Tiers 1–2 was either (a) considered by the examiner and not made the basis of an anticipatory rejection that survived, or (b) raised by a third party in an IPR that terminated by settlement before institution. No prior-art reference has ever been adjudicated to anticipate any claim of 7,995,897. The mapping below is therefore candidate §102 art, not established anticipation. Anticipation requires a single reference disclosing every element of the claim as arranged; anything requiring two references is a §103 question, not §102.

4.1 Claim 1 — the elements to be met

Claim 1 requires, in one method: (i) record MPEG moving pictures; (ii) plus reduced-pixel "first pictures" corresponding to those moving pictures; (iii) record JPEG "first still pictures"; (iv) plus reduced-pixel "second pictures" corresponding to the stills; (v) both sets of reduced-pixel pictures encoded by the second (JPEG) method; and (vi) record "second still pictures" encoded by the first (MPEG) method so an MPEG-only player can decode them, while a second player decodes the JPEG stills.

4.2 Claim 2 — MPEG / JPEG designation

Claim 2 depends from claim 1 and specifies that the first encoding method is MPEG and the second is JPEG. This is the one claim element for which the examiner-cited art is genuinely on point: JP 10‑108133 (Ishikawa) discloses exactly the MPEG‑I‑picture + JPEG pairing. But because claim 2 incorporates all of claim 1, the missing thumbnail elements defeat §102 anticipation of claim 2 as well, exactly as they do for claim 1.

4.3 Claims 3–9 (dependent) — no mapping possible

I do not have verbatim text for claims 3–9 and will not fabricate a §102 mapping for them. (Consistent with the prior section's flag: the authoritative full text I retrieved reproduces claim 1 in full and truncates claim 2 mid-sentence. Claims 3–12 remain unverified.)

4.4 Claims 10–12 (likely a second independent claim) — no mapping possible

BlackBerry's IPR2019‑00095 challenged claims 4–6 and 10–12, a distinctly numbered block consistent with a second independent claim — plausibly an apparatus claim given the title ("…and video reproducing apparatus and method"). I cannot confirm the number or scope of any additional independent claim. If these are reproducing-apparatus claims (decoding means for the first encoding method, selecting means for a compressed/thumbnail still, control means to reproduce the single-frame moving picture corresponding to the selected thumbnail — as the specification's THIRD/FOURTH EMBODIMENT text suggests), then the most relevant §102 art would be:

• JP 10‑233995 A — electronic still camera reproduction display method (thumbnail list display and selection);
• US 6,370,274 (Peters) — retrieval of a coded moving-image record via its reduced-size representation; and
• JP 10‑164483 (Takaichi) — storage device linking a main image to a reduced-size image,
  with the caveat that none appears to disclose reproducing an MPEG I-picture in place of a JPEG still when the thumbnail is selected — which is the specific and unusual reproducing step the specification describes.

5. Ranked conclusion — "most relevant prior art"

1. JP 10‑108133 A (Ishikawa) — the closest and most probative reference. It is the only reference that the patentee itself admitted as disclosing the core dual-encoding concept, it was the lead exhibit (Ex. 1002) in the IPR against the '897 patent, and it maps to claim 1's "second still pictures encoded by the first encoding method" limitation. Its failure to disclose the common-format reduced-pixel companion pictures for both moving and still pictures is what distinguishes claim 1 — and is presumably the reason the patent survived.
2. JP 10‑164483 A (Takaichi) and US 6,370,274 B1 (Peters) — the reduced-size/thumbnail-image references; the natural §103 companions to Ishikawa.
3. WO 92/09169 A1 — establishes the long-predating practice of writing still images in a PC-compatible digital format from a still-video camera (undercuts any breadth claim to that feature).
4. Stevens, "Rapid decimation of compressed images," Research Disclosure, Feb. 1998 — teaches thumbnail generation from compressed data; undermines any claim element read to cover that technique.
5. Hitachi MPEGCAM (1997 manual, press release, and IEEE/ISCE papers) — the highest-value unadjudicated §102(b) prior-art set, because it is the patentee's own commercial embodiment predating the priority date.
6. JP 10‑233995 A — the best reference for the reproducing/index-display side of the patent.

6. Explicit uncertainty flags

1. U.S. front-page citation list for 7,995,897 is not verified. The Tier‑1 U.S. table is reconstructed from the '088 and '229 front pages plus OCR'd text (some dates/titles are visibly garbled — e.g., "5,138,459 A 8/1992 Roberts," "6,356,769 B1 3/2002 Abe," "4,691,253 A 9/1987 Silver" appear in variant forms across sources). Re-pull the granted front page for application 12/124,229 from USPTO Patent Public Search before relying on any individual U.S. citation.
2. Foreign list is verified but partly untitled. The JP 06/07/08‑series entries are present as bare numbers and dates only; I did not resolve titles for those.
3. JP 2000‑188736 is a date anomaly (published 2000‑07‑04, post-priority). Do not treat it as §102(a)/(b) art.
4. Claims 3–12 are unverified, so §102 mapping for them is impossible and I have not attempted it. My inference of an apparatus independent claim remains unconfirmed.
5. No adjudicated anticipation exists. All PTAB challenges (IPR2018‑00906 Olympus; IPR2019‑00095 BlackBerry; IPR2019‑00464 Huawei) terminated by settlement before institution; no final written decision. The patent's adjusted expiration is 2020‑12‑01 and its status is "Expired – Fee Related."
6. Priority date: 1999‑07‑05 (JP 11‑189868, per specification) vs. 1999‑05‑07 (Google's assumed "prior art date"). Every §102 date conclusion above is tied to the former; a shift to the latter would move US 5,987,179 and possibly others across the §102(a)/(b) line.

Sources: Google Patents US7995897B2 · FreePatentsOnline 7,995,897 front page (foreign citations) — verified · US 8,417,088 (continuation front page, References Cited) · US 9,451,229 (descendant front page, References Cited) · IPR petition exhibit list for 7,995,897 (Exs. 1002–1004, 1009) — verified · Justia US 10,349,030 record — MPEGCAM/litigation NPL · IPR2019‑00464 (Huawei)

I'll ground the § 103 analysis in the reference set already assembled, and try to pull the actual petition grounds and any additional reference details.

Good — Peters (US 6,370,274) is confirmed as IPR exhibit art with thumbnail/data-stream claims. Let me pull the remaining claim text and the JP reference.

I now have the full claim set (four independent claims: 1, 4, 7, 10). Let me pull the preambles of claims 4 and 7 and the Takaichi reference details.

I was able to pull the actual Olympus petition text analyzing Ishikawa, the JPO bibliographic record for JP 10-108133, the Peters patent's own claim set, and — importantly — the complete 12-claim set of the '897 patent. That resolves two open flags from my earlier sections.

Obviousness Analysis — US 7,995,897 under 35 U.S.C. § 103

Building on prior sections. This analysis uses the reference set developed in the Prior Art section. It does not repeat the bibliographic, litigation, PTAB, or assignment material. Where the earlier sections flagged uncertainty about claims 3–12, I now have verifying text and flag the correction explicitly (Section 2).

Threshold caveats, stated up front:

1. This is an analyst assessment, not a legal opinion. No court or the Board has ever adjudicated validity of this patent. All three IPRs terminated pre-institution by settlement (IPR2018-00906, 2018‑12‑26; IPR2019‑00095, 2019‑04‑29; IPR2019‑00464, 2019‑04‑17). There is no FWD, no estoppel, and no substantive construction of any claim.
2. Commercial relevance is now minimal. Per the patent record, legal status is "Expired – Fee Related," adjusted expiration 2020‑12‑01. An obviousness position today is defensive background, not a live litigation weapon. The prior section's § 286 point (a complaint filed on 2026‑09‑28 reaches back only to 2020‑09‑28) dominates any merits case.
3. Governing law: pre-AIA § 103(a). Effective priority is 1999‑07‑05 (JP 11‑189868). KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007), controls, not rigid TSM.

1. Person of ordinary skill in the art (POSITA)

A POSITA in July 1999 would have: (i) a bachelor's degree in EE/CS (or equivalent) plus ~2–3 years in digital image/video compression and consumer imaging products; (ii) working familiarity with MPEG‑1/MPEG‑2 (including intra-coded I‑pictures) and JPEG; (iii) familiarity with removable-media recording formats, file management, and index/thumbnail ("search screen") user interfaces for cameras and DVD recordable players; and (iv) knowledge of the CCD readout trade-off the '897 specification itself recites — video capture is real-time and pixel-limited; still capture is not and can read a full sensor frame. This is a mechanical-and-conventional-engineering level of skill, not an innovator level — which matters, because every element of the '897 claims is a combination of known building blocks.

2. The claim set — now verified (supersedes earlier uncertainty flags)

Correction to prior sections. My earlier summaries said: "Claim 1 is the sole independent claim I can verify" and "plausibly an apparatus claim … I cannot confirm the number or scope of any additional independent claim." That is now superseded. The full claim set (from FreePatentsOnline / Justia for 7,995,897) shows 12 claims with FOUR independent claims. Also, the earlier inference that BlackBerry's IPR2019‑00095 challenge to "claims 4–6 and 10–12" implied a second independent claim is confirmed and expanded — those two blocks are the apparatus claim 4 family and the method claim 10 family, and there is a third independent apparatus claim (claim 7) that BlackBerry did not challenge.

Key structural observation for § 103: the independent claims divide cleanly into (A) record-side dual-encoding + common-format thumbnails (claim 1) and (B) reproduce-side thumbnail-index-then-play-the-corresponding-full-item (claims 4, 7, 10). Both halves were independently known in the art, and the two halves are connected by exactly one concept — a link/correspondence between the thumbnail and its full-resolution counterpart — which is express prior art.

3. Reference capability chart (§ 102 status and § 103 teaching)

Not usable: JP 2000‑188736 A (published 2000‑07‑04) is post-priority and cannot be § 102(a)/(b) art — consistent with the flag in my prior section.

4. Claim 1 — element-by-element § 103 chart

Every element is met. The only limitation for which the primary references need an explicit bridge is the "encoded by the second encoding method" uniformity requirement of the two thumbnail sets — and that bridge is supplied by design-incentive reasoning plus Stevens and the ordinary thumbnail convention (§ 6(e)).

5. The combinations, and why a POSITA would have made them

Combination 1 (PRIMARY) — Ishikawa + Peters

What the combination yields: Ishikawa supplies the consumer camera that encodes the same image data by plural differing encoding processes, produces a thinned reduced-size version, creates link data, and records them together on a removable medium — including the dual still/video camera of its second embodiment. Peters supplies the architectural and reproduce-side half: a first coding unit optimized for moving-image compression and a second for still-image compression; both streams on one carrier; a third stream of lower per-image information (thumbnails); reference information tying corresponding images across streams; and a retrieval unit with two decoders and a mode that, on a still-select event, determines the corresponding image number and reads the corresponding still image from the other stream.

Motivation to combine (KSR-recognized rationales):

• (a) Same field, same problem, same solution shape. Both references are in image coding/recording/retrieval. Peters' stated aim is to let a record carrier serve two different classes of retrieval unit (a moving-image unit and a still-image unit) — literally the compatibility problem Ishikawa identifies and the '897 patent's own background identifies.
• (b) Express teaching of the two-encoding architecture for the same image series on one carrier. Peters' abstract is claim‑1-shaped: first coding unit (moving-optimized) + second coding unit (still-optimized), "record[ed] … on one and the same record carrier." A POSITA seeking Ishikawa's compatibility goal would adopt Peters' architecture as the implementation.
• (c) Express teaching of the reduced-size third stream. Peters claim 17 supplies the "pictures … having a smaller number of pixels" elements directly, and does so on the same carrier — the precise structural relationship the '897 claim recites.
• (d) Express teaching of the correspondence/link. Peters claims 14–15 and Ishikawa's "link data" are the same idea: metadata tying a thumbnail (or a position in one stream) to its counterpart in another stream. Once you have that, claims 4/7/10's "selected picture → corresponding moving/still picture" is a straight application of the reference's own disclosed control flow.
• (e) Inter-plane redundancy elimination — the cost motive the patent itself claims. The '897 patent's "wherein the first pictures and the second pictures … are encoded by the second encoding method" limitation exists to save a decoder. The patent's own stated benefit is "the cost of the reproducing system can be reduced" by avoiding a separate expanding means. That same cost calculus — index thumbnails are single images, JPEG is the codec already present for stills, so use JPEG for both thumbnail sets and only one thumbnail decoder is needed — is a design incentive recognized in the prior art, not an invention. KSR: where a technique has been used to improve one device, a POSITA with ordinary creativity would employ it to improve similar devices in the same way; here the "improvement" is deleting a redundant codec.
• (f) Predictable results. Combining two-image-stream recording (Peters) with multi-format encoding of the same image data (Ishikawa) yields nothing more than the expected sum: each player decodes the stream it can decode. There is no unpredictable interaction, no new capability, and no result the POSITA would not have foreseen.

Net: Ishikawa + Peters renders claim 1 obvious; claim 2 (MPEG/JPEG) is expressly met by Ishikawa's JPEG unit and by the MPEG+JPEG compression unit of Takaichi; claim 3 is a display.

Combination 2 — Ishikawa + Peters + Stevens (or + JP 10‑200859)

Target: the "smaller number of pixels" generation step executed on compressed data. Stevens' "Rapid decimation of compressed images" (Research Disclosure, Feb. 1998) teaches exactly that without full decompression; JP 10‑200859 teaches reduced-resolution image generation. Motivation: the patentee's own preferred approach (its t0000001.jpg thumbnails derived from the already-compressed item) requires this. Stevens makes the "produce the thumbnail from the compressed stream" variant obvious; JP 10‑200859 makes the general reduced-resolution step obvious. Predictability: decimation and downscaling are mechanical.

Combination 3 — Ishikawa + Takaichi (+ Peters)

Target: implementing claim 1's dual-format capability within one compression unit. The Olympus-family petition record states Takaichi's "image data compression unit 13 is capable of multiple encoding methods — namely, MPEG and JPEG," and that "all a POSITA would have had to do … was to incorporate Ishikawa's image memory 116 … between Takaichi's A/D converter 12 and image data compression unit 13." Motivation: component-count and cost reduction — one DCT/quantization engine used in two modes rather than two engines. This corresponds to the '897 specification's own contemplated embodiment ("both units 105 and 106 can share a processing circuit for such processings as discrete cosine conversion and can switch the mode"). Predictability: selecting one of two known encoded formats for a given capture is a design choice with an expected result.

Combination 4 — Ishikawa + MPEGCAM (Hitachi's own 1997 product/literature) and/or the MPEG-I-picture technique

Target: the "second still pictures encoded by the first encoding method" limitation and its stated purpose. Two independent routes:

• MPEGCAM (1997) — a shipping camera recording MPEG video and PC-compatible still images, the patentee's own commercial embodiment. If its capture behavior matches, it is § 102(a)/(b) art and possibly § 102(b) public-use/on-sale art as well.
• MPEG's own intra-coded I-picture — the specification concedes (Background Art) that one could "record both MPEG I pictures and JPEG file pictures," citing JP 10‑108133; and it describes that as the prior art. Using an MPEG I-picture to hold a single still is a fundamental, well-known feature of the MPEG standard itself (the specification says so: "the MPEG standard is a well-known technique"), so encoding a still as an MPEG I-picture to obtain MPEG-only-player compatibility is the paradigmatic known technique applied to a known problem under KSR. Peters claim 16 reinforces this: it claims the very inter-vs-intra split ("code each image independently of the other images") as a design option in the same two-stream recording system.

Motivation: the compatibility goal is express and identical in Ishikawa ([0008]) and in the '897 background. Predictability: total.

Combination 5 (reproduce-side) — Ishikawa/Peters + JP 10‑233995 A, for claims 4, 7, 10 and their dependents

Critical motivation point for the reproduce-side claims: the "thumbnail index → select → play the full item" workflow was the standard camera/player UX of the era (JP 10‑233995) and Peters' control logic already recited the hard part — mapping a position in one stream to the corresponding image in a second, differently-coded stream. Adding "and play the moving picture when a moving thumbnail is picked" is the ordinary use of the two decoders Peters already provides.

6. Consolidated motivation-to-combine argument (as it would be briefed)

1. Both references address the identical problem and state it. Ishikawa's stated problem is reproduction of photographed data by devices with "different types of environments"; the '897 background states the same goal (permit MPEG recordable/ordinary players to reproduce still pictures) and admits JP 10‑108133 as the known solution. An admitted-problem + admitted-solution pair in the same field is strong KSR motivation.
2. Peters supplies precisely the two-stream, one-carrier, two-decoder architecture, plus the reduced-size third stream, plus the correspondence metadata — i.e., the claims' plumbing, disclosed as an integrated system.
3. Takaichi/Peters' claim 16 supply the intra/inter distinction that makes "second still pictures encoded by the first encoding method" (an MPEG I‑picture) a selection among disclosed options, not a discovery.
4. The common-thumbnail-format limitation is a cost-driven simplification with a predictable benefit the patent itself claims ("the cost of the reproducing system can be reduced") — design incentive, not invention. KSR: predictable use of a known technique to improve similar devices.
5. Market/industry pressure. 1997–1999 was the period of DVD recordable players and DVD/MPEG camcorders with a "search screen" convention; WO 92/09169 (PC-compatible still output), MPEGCAM (1997), and JP 10‑233995 (thumbnail playback UI) show the industry already building the pieces. The design incentive was commercial interoperability with PCs and existing MPEG players.
6. No unexpected results, no teaching away. Neither reference disparages the other's approach; both are cumulative and compatible. Peters' first/second/third/fourth stream taxonomy actually invites adding further parallel encodings of the same image series.

7. Anticipated non-obviousness rebuttals and how they would be met

8. Weaknesses, gaps, and confidence

High confidence:

• All four primary references pre-date the priority date under either 1999‑07‑05 or Google's assumed 1999‑05‑07 (Ishikawa 1998‑04‑24; Peters filed 1994‑08‑22; Takaichi ~1998; WO 92/09169; Stevens Feb. 1998; MPEGCAM 1997; JP 10‑233995 1998‑09‑02; JP 10‑200859 1998‑07‑31). The priority-date discrepancy flagged in the prior section therefore does not affect this § 103 analysis at all.
• The complete claim set (12 claims; independent claims 1, 4, 7, 10).
• Ishikawa's disclosure: verified from its own JPO bibliographic record (出願番号 特願平8‑259157, 出願日 1996‑09‑30, 公開番号 特開平10‑108133, 公開日 1998‑04‑24) and from the petition's quotation of its specification.
• Peters' claim set (claims 14–18) and filing date 1994‑08‑22.
• Ishikawa's admitted-prior-art status — the '897 specification cites JP 10‑108133 by number in the Background Art.

Medium/low confidence — verify before relying:

1. JP 10‑164483 (Takaichi)'s exact publication date and full text. I have its petition-derived characterization ("image data compression unit 13 … capable of multiple encoding methods — namely, MPEG and JPEG") but not the document. If it post-dates 1999‑07‑05, it drops out; if it predates, it strengthens the MPEG/JPEG dual-codec rationale considerably.
2. The JP 10‑108133 citation in the petition record I found (PTAB petition 1510595) is quoted in an analysis that also discusses the sibling '529 and '760 patents, and includes claim language about "third pictures corresponding to the moving pictures or the second still pictures" that belongs to the '529 patent (US 7,457,529), not to '897's claims. I have therefore not attributed that "third pictures" language to claim 1 of '897. Anyone briefing from that petition must confirm which patent each passage addresses.
3. Titles/dates for the JP 06/07/08-series references remain unresolved (carried forward from the Prior Art section) and are irrelevant to the combinations above.
4. MPEGCAM's specification-level disclosure — I have the 1997 dates and its MPEG-video/PC-still capability from litigation contentions, but no retrieved manual page confirming thumbnail generation. Treat as a § 102(b)/public-use line still to be developed, not as an established reference.
5. No tribunal has ever ruled. Asserting that these combinations would have been found obvious is an assessment; asserting that any claim was held obvious would be false.

9. Bottom line

Under pre-AIA § 103(a) and KSR, US 7,995,897's claims appear vulnerable to a two-reference obviousness attack, with a well-populated secondary reference set for each remaining limitation:

• Claim 1 ⇐ Ishikawa (JP 10‑108133) — the admitted prior art that already dual-encodes the same image data (JPEG + an "nth" format), generates a thinned reduced-size version, and records it with link data on a removable medium — combined with Peters (US 6,370,274) — first/moving-optimized and second/still-optimized coders of the same image series on one record carrier, plus a lower-information third stream, cross-stream reference information, and a two-decoder retrieval unit that jumps to the corresponding image in the other stream. Motivation: identical admitted problem (playback-device compatibility), express architectural teaching, and a cost-reduction design incentive.
• Claims 2, 5, 8, 11 ⇐ Ishikawa's JPEG unit + Takaichi's MPEG-and-JPEG compression unit + MPEGCAM.
• The "smaller number of pixels" limitations ⇐ Stevens, Research Disclosure (Feb. 1998); JP 10‑200859.
• The "second still pictures encoded by the first encoding method" limitation ⇐ MPEG's own I‑picture intra-coding (conceded as known in the '897 background) + Peters claim 16 (independent/intra coding as a disclosed option) + MPEGCAM (1997).
• Claims 4, 7, 10, 12 ⇐ JP 10‑233995 (thumbnail-list selection at reproduction) + Peters claims 14–15 (reference information and the "locate the corresponding image in the second stream" control flow).
• Claims 3, 6, 9 ⇐ any display in a camera or player.

The two strongest countervailing points a patentee would press are (i) the absence of any reference expressly stating that both thumbnail sets should be encoded in the same (second) format, and (ii) no nexus evidence to convert the family's commercial history into secondary-consideration weight. Neither is a merits problem for the patentee so much as an evidentiary one for the challenger — and both are moot in practical terms, since the patent's adjusted expiration of 2020‑12‑01 means there is essentially no damages exposure left to defend against as of 2026‑09‑28.

Sources

• Google Patents, US 7,995,897 B2 — https://patents.google.com/patent/[US7995897B2](/patent/US7995897B2)/en (admitted prior art JP 10‑108133; status "Expired – Fee Related," expiration 2020‑12‑01)
• FreePatentsOnline, 7,995,897 ("What is claimed is…" / foreign citation list) — https://www.freepatentsonline.com/7995897.html
• Justia Patents, US 7,995,897 (full claim text, claims 4–12) — https://patents.justia.com/patent/7995897
• Justia "company profiles" rendering of the '897 claims (claims 4, 7, 10 preambles) — https://companyprofiles.justatic.com/patent/7995897
• Olympus-family IPR petition analysis of Ishikawa (PTAB petition 1510595) — https://ptacts.uspto.gov/ptacts/public-informations/petitions/1510595/download-documents
• PTAB petition 1510559 (Ishikawa / Takaichi / '760-family analysis) — https://ptacts.uspto.gov/ptacts/public-informations/petitions/1510559/download-documents
• JP 10‑108133 (特開平10‑108133) JPO bibliographic record — https://jglobal.jst.go.jp/detail?JGLOBAL_ID=200903003664180124 (出願番号 特願平8‑259157; 出願日 1996‑09‑30; 公開日 1998‑04‑24)
• JP 10‑108133 A, full text exhibit — https://www.docketalarm.com/cases/PTAB/IPR2018-00907/Inter_Partes_Review_of_U.S._Pat._8417088/docs/05-18-2018-Petitioner/Exhibit-1002-2-Ex_1002___Ishikawa_JP_10_108133.pdf
• US 6,370,274 B1 (Peters et al.), full text and claims 13–22 — https://www.freepatentsonline.com/[6370274](/patent/6370274).html ; PDF exhibit — https://www.docketalarm.com/cases/PTAB/IPR2018-00907/Olympus_Corporation_v._Maxell_Ltd/docs/05-18-2018-Petitioner/Exhibit-1003-Ex_1003___Peters_US6370274B1.pdf
• IPR2018‑00906 case record (Olympus v. Maxell, app. 12/124,229, TC 2100, terminated 2018‑12‑26) — https://ipverse.greyb.com/ptab-web/cases/case-details/IPR2018-00906
• IPR2019‑00464 case record (Huawei v. Takahashi, terminated-settled 2019‑04‑17) — https://ipverse.greyb.com/ptab-web/cases/case-details/IPR2019-00464