US 8170394

I'll search for current information on this patent and check for any 2026 litigation activity.

Let me check for CAFC 2026 docket activity and the reissue status.

Let me verify whether there's any 2026 Federal Circuit activity specifically tied to 8,170,394, and check the reissue.

US Patent 8,170,394 — Analyst Summary

Search scope note: I searched for the exact identifier 8170394 / 8,170,394. All substantive technical and bibliographic facts below are drawn from the authoritative full text of the patent you supplied (Google Patents, fetched 2026-09-25) and are cross-checked against live results (USPTO/PTAB records, NPE litigation database, IPVerse, Docket Alarm). I did not find any 2026 Court of Appeals for the Federal Circuit docket in which U.S. Patent 8,170,394 is itself the appealed patent. Details and caveats are at the end.

1. Bibliographic data

Lineage of the family: The '394 patent is the original grant in a chain of nine US applications sharing the 2005‑08‑30 priority. It was followed by continuation US 13/443,955 → US 9,489,985 B2, and further continuations US 15/287,074 → US 9,743,129 B2, US 15/670,155 → US 11,470,379 B2, US 17/868,139 → US 11,812,091 B2, US 18/130,594 → US 11,924,502 B2, US 18/138,178 → US 11,974,007 B2, US 18/378,854 → US 11,974,008 B2, US 18/604,771 → US 12,219,202 B2, and US 19/005,119 → US 12,634,547 B2. The foreign counterpart is JP 4640046B2.

2. Abstract (verbatim)

"A digital content reproducing apparatus is provided with a plurality of user operation interfaces, e.g., a linear content operation panel and an interactive content operation panel, a data monitor unit monitors information on digital contents, and upon occurrence of a change, the plurality of user operation panels are automatically and exclusively displayed in an operation panel display area. Accordingly, only usable operation keys can be displayed, user operation learning time can be shortened, since the panel rendering area is made small, a mouse motion distance can be shortened, and easy to use can be improved. Further, since the panel rendering area is made small, the image display area can be made relatively large."

3. What the invention is, in plain language

The patent addresses a usability problem in digital broadcast receivers (HDD/DVD decoders, digital‑TV PCs): to handle both ordinary video/audio ("linear") content and data‑broadcast ("interactive") content, the remote control or on‑screen panel had to carry every key — play, stop, pause, fast‑forward, rewind, skip, plus 0–9, arrow keys, "decide," and four colour keys. That made remotes large and panels crowded.

The claimed solution is to maintain two complete, ready‑made operation panels of the same size — a linear content operation panel (transport controls) and an interactive content operation panel (numeric/arrow/colour keys) — and to automatically show only one of them at a time in the same panel rendering area, selected by a monitor that watches metadata about the content being reproduced. Metadata examples given are the auto_start_flag in the PMT data‑encoding descriptor (per ARIB TR‑B14 for Japanese terrestrial digital broadcasting), a generic "content switching flag," attributes such as recording day/time, and analysis of BML (Broadcast Markup Language). A key described feature is an "appreciation term" (shelf‑life) for time‑sensitive data such as news and weather.

Claim 2 expressly distinguishes the two panels as "distinct panels from each other, which are not generated by a disabling of buttons" — i.e., the invention is not the prior‑art approach of greying out unusable keys on one large universal panel; it is the swapping of two separate, purpose‑built panels.

4. The independent claims (plain-language overview)

There are three independent claims: 1, 2, 4, and 7 (i.e., four independent claims total, with 3, 5, 6, 8, 9 dependent).

Claim 1 — Term/type-driven panel selection

A digital content reproducing apparatus comprising:

• a content input/output unit doing I/O control of digital contents;
• a data monitor unit that (a) judges whether the digital contents are linear or interactive and (b) determines an appreciation term of the contents; and
• an operation panel display unit that displays either the linear panel or the interactive panel according to that judgment/determination.

The claim then specifies a four‑way mapping that is, notably, crossed/inverted relative to intuition:

Analyst flag: as literally claimed, the panel shown is the opposite type to the content type when the content is still within its appreciation term, and the matching panel when it is outside. This matches the specification's stated intent — if fresh data‑broadcast content is within term, the user should be steered to the interactive/data‑broadcast controls; if stale, the data broadcast is suppressed and only ordinary transport controls are offered. This inverted logic is a distinctive limitation and is a notable claim‑construction risk area.

Claim 2 — Exclusive alternative panel display on one screen

A digital content reproducing apparatus comprising:

• an input unit that inputs digital content;
• a reproducer that reproduces the inputted content;
• an output unit that outputs the reproduced content;
• a display that displays the outputted content together with an alternative display of either a linear content operation panel (allowing user instruction regarding linear reproduction functions of the reproduced content) or an interactive content operation panel (allowing user instruction of interactive functions to an outside of the reproducing apparatus), wherein the two panels are distinct from each other and are not generated by disabling of buttons; and
• a controller that controls the alternative display so that only one of the two panels is displayed exclusively at any given time, together with the outputted content;
• wherein the outputted digital content and whichever panel is shown are displayed concurrently in one screen.

Claim 3 (dependent on 2)

The two panels are common in size and are alternatively switched between each other in the same panel rendering area of the screen as alternative operation panels.

Claim 4 — Button‑set distinction

Same as claim 2 (input unit, reproducer, output unit, display of content with an alternative linear/interactive panel, controller enforcing exclusivity, concurrent display on one screen), except the distinguishing limitation is that the buttons of the linear content operation panel are mutually different from the buttons of the interactive content operation panel.

Claim 5 (dependent on 4)

All the buttons (across both panels) are mutually different from each other.

Claim 6 (dependent on 4)

Same size / same panel rendering area / alternative switching limitation, applied to claim 4.

Claim 7 — Function‑set distinction

Same structure as claims 2 and 4, except the distinguishing limitation is that buttons of the linear content operation panel produce mutually differing functions from the functions of buttons of the interactive content operation panel.

Claim 8 (dependent on 7)

All buttons of both panels provide mutually differing functions from each other.

Claim 9 (dependent on 7)

Same size / same panel rendering area / alternative switching limitation, applied to claim 7.

Summary of the claim families: Claim 1 is the content‑metadata/term‑based automatic switching claim. Claims 2–3 are the "two distinct panels, exclusive alternative display, same screen" claim with a same‑size/same‑area dependent. Claims 4–6 layer on a different‑buttons limitation; claims 7–9 layer on a different‑functions limitation. All of claims 2–9 require the panels not to be produced by disabling buttons, and require the panel and the video to be concurrently on screen.

5. Litigation, PTAB, and 2026 status (as searched)

Enforcement / district court

• Maxell, Ltd. v. Blackberry Corp., No. 1:17‑cv‑01446 (D. Del.) — '394 patent asserted. (NPE Litigation Database; referenced in the PTAB institution decision.)
• Maxell, Ltd. v. Samsung Electronics Co., Ltd., No. 5:25‑cv‑00052‑RWS (E.D. Tex.) — a docket control order in this case appears as an exhibit (EX2004) in a related 2025 PTAB proceeding.
• Maxell, Ltd. v. VIZIO, Inc. — complaint asserting, among others, the '394 patent at claims 2, 4, 5, 7 and 8, alongside US 8,549,109, US 10,958,971, and US 11,017,815, seeking a limited exclusion order and cease‑and‑desist order under Section 337.
• ITC Section 337 investigations involving this family are listed on Google Patents as 337‑TA‑1312, 337‑TA‑1324, 337‑TA‑1338, and 337‑TA‑3643.

PTAB — three IPRs against the '394 patent, all settled (never finally decided on the merits):

The IPR2019‑00089 institution decision (BlackBerry v. Maxell, Patent 8,170,394 B2, Paper 10) is public and directly on point: it instituted review of claims 2–9 on all grounds. Because the proceeding settled, no final written decision on validity exists for this patent.

Post‑grant events of note

• A Fee payment / reissue application filed legal event coded "RF," effective 2024‑04‑19, appears in the Google Patents legal‑events table for this patent. I could not independently corroborate a reissue application number, a reissue patent number, or its current status from a second source. Treat this as unverified; it may indicate a reissue (or a related record) that is not yet reflected in the sources I could reach.
• Maintenance fees paid through the 12th year (event dated 2023‑10‑25), consistent with the "Active / expires 2030‑08‑04" status.

2026 Federal Circuit dockets — negative finding, stated precisely
I did not locate a 2026 CAFC appeal in which US 8,170,394 is the patent on appeal. The Maxell‑related 2026 CAFC dockets my searches surfaced concern other patents or parties and should not be attributed to the '394 patent:

• Maxell, Ltd. v. [Samsung Electronics Co.](/litigations/by-defendant/Samsung%20Electronics%20Co.), Ltd., No. 26‑1111 (Fed. Cir., filed 2025‑10‑29) — briefing activity in March/April 2026 (opening brief 2026‑03‑24; Samsung's response brief extended to 2026‑06‑26). Patent‑at‑issue not established from the sources retrieved.
• Maxell, Ltd. v. Samsung Electronics Co., Ltd., No. 2026‑1625 (Fed. Cir., filed 2026‑04‑07) — appeal from the PTO; counsel Robert G. Pluta (Mayer Brown). Patent‑at‑issue not established.
• Optoma Technology, Inc. v. Maxell, Ltd., No. 2025‑1659 (Fed. Cir.) — argued 2026; unrelated subject matter.
• Fish & Richardson's 2026 award coverage refers to an August 2025 Federal Circuit win for LG Electronics regarding Mondis Technology display patents — not the '394 patent.

Caveat: docket coverage for very recent CAFC filings can lag. If a 2026 appeal specifically involving 8,170,394 exists, my searches did not surface it, and I am not asserting that none exists — I am reporting that I could not find one.

6. Explicit uncertainties and data discrepancies

1. No CAFC 2026 appeal for 8,170,394 found. Reported as a negative search result with the caveat above.
2. Reissue status unverified. The "RF – Reissue application filed" event (effective 2024‑04‑19) is from the Google Patents legal‑events table alone; I could not confirm it or find a resulting reissue patent number.
3. Priority‑date discrepancy across databases. Google Patents lists the priority date as 2005‑08‑30 (consistent with JP 2005‑248576 filed 2005‑08‑30). Some Unified Patents pages list the priority date as 2005‑08‑29 for family members, possibly a time‑zone artifact. The authoritative value from the patent document is 2005‑08‑30.
4. Assignee history. The patent records grant‑time assignment to Hitachi, Ltd.; the current owner of record is Maxell, Ltd., and the chain (Hitachi → Hitachi Consumer Electronics → Hitachi Maxell → Maxell → Maxell Holdings → Maxell) is documented but should be confirmed against current USPTO assignment records for any filing/standing purpose.
5. Claim 1's inverted mapping is unusual as literally claimed; I have not located an authoritative claim‑construction ruling interpreting it, because all three IPRs settled before final decision.
6. Typographical note (not a correction): the patent text contains apparent OCR/typographical artifacts, e.g., "interactive content operation panel AS" for "A5," "when the flat becomes '0'" for "flag," and "distinct panels form each other" in the PTAB's reproduction of claim 2. I have not altered any identifiers.

I'll research the litigation history for US patent 8170394 using the provided data and live searches.

Let me gather more details on the specific cases.

Litigation and Post-Grant Proceedings Involving U.S. Patent No. 8,170,394

Patent: U.S. 8,170,394 B2 — "Multimedia player displaying operation panel depending on contents"
App. No.: 11/508,209 | Filed: Aug. 23, 2006 | Granted: May 1, 2012
Priority: JP 2005-248576 (Aug. 30, 2005) | Original assignee: Hitachi, Ltd.
Current owner: Maxell, Ltd. (via Hitachi Consumer Electronics → Hitachi Maxell → Maxell)
Adjusted expiration: Aug. 4, 2030 | Status: Active

Below I distinguish (A) district-court and ITC actions, which are the litigation proper, from (B) PTAB post-grant proceedings, which are adversarial but not "litigation" in the Article III sense. I note where sources conflict or where I cannot confirm a detail.

A. District Court and ITC Litigation

1. Maxell, Ltd. v. BlackBerry Corporation & BlackBerry Ltd.

Sources: Unified Patents litigation portal (https://portal.unifiedpatents.com/litigation/Delaware%20District%20Court/case/1:17-cv-01446); Stanford NPE Litigation Database (https://npe.law.stanford.edu/patent/8170394); Docket Alarm case page (Closed 03/29/19).

2. Maxell, Ltd. v. Lenovo Group Ltd., Lenovo (United States) Inc., and Motorola Mobility LLC

Source: Maxell's 337-TA-1338 complaint, ¶106 ("The '394 Patent is also the subject of Maxell, Ltd. v. Lenovo Group Ltd., et al., No. 6:22-cv-00334, which is stayed until the determination of Inv. No. 337-TA-1312 becomes final.").

3. Certain Mobile Electronic Devices — ITC Inv. No. 337-TA-1312

Source: Maxell 337-TA-1338 complaint, ¶106; Google Patents family-litigation data.

4. Certain Mobile Electronic Devices — ITC Inv. No. 337-TA-1324

Sources: USITC notice, https://usitc.gov/secretary/fed_reg_notices/337/337_1324_notice_05152023sgl.pdf; 87 FR 51445-46.

5. Certain Smart Televisions — ITC Inv. No. 337-TA-1338

Sources: 87 FR 64110 (Oct. 21, 2022); USITC notice 337_1338_notice09252023sgl.pdf; Sunshine Act notice, 2023-21534.

6. Maxell, Ltd. v. VIZIO, Inc. (Central District of California) — related

Source: cited in Maxell's 337-TA-1338 Responsive Markman Brief (Exhibits 19–20 reference "Maxell, Ltd., et al. v. VIZIO, Inc., No. 2:21-cv-06758-GW-DFM," with claim construction on U.S. 11,017,815 and 8,170,394).

7. ITC Inv. No. 337-TA-3643 — unverified

Google Patents' family-litigation feed lists an ITC matter "337-TA-3643" for this family. I could not independently verify a Section 337 investigation with that number involving the '394 patent; the number is outside the sequence of the contemporaneous Maxell investigations (1312, 1324, 1338). I am reporting it literally as listed, but I flag it as not confirmed and recommend verifying against ITC EDIS before relying on it.

B. PTAB Post-Grant Proceedings (not litigation, but adversarial)

All three were instituted and then terminated by settlement, not decided on the merits:

Sources: Unified Patents PTAB case list for patent 8170394 (https://portal.unifiedpatents.com/ptab/caselist?patent.patent_number=8170394); IPVerse case detail for IPR2023-00316 (https://ipverse.greyb.com/ptab-web/cases/case-details/IPR2023-00316); PTAB institution decision in IPR2022-01348.

C. Other Proceedings Directly Affecting This Patent

• Reissue application filed — recorded in the USPTO legal-events stream as "Reissue application filed," effective date April 19, 2024 (event date May 21, 2024). This is a post-grant prosecution proceeding on the '394 patent. I have not confirmed a reissue application number, so I state the fact as recorded without an identifier.
• Large continuation family — this patent is the root of a family that Maxell has continually refiled and enforced (US 9,489,985; 9,743,129; 11,470,379; 11,812,091; 11,924,502; 11,974,007; 11,974,008; 12,219,202; 12,634,547), which is relevant context for the assertion campaigns above.

Summary of Assertion Campaigns Against the '394 Patent

No case involving U.S. 8,170,394 appears to have reached a trial verdict or a Federal Circuit appeal on the merits based on the material I reviewed; every identified contested matter involving this patent resolved by settlement or withdrawal. If you need a truly exhaustive confirmation, the authoritative sources to run in full are ITC EDIS (https://edis.usitc.gov) for the Section 337 investigations, PACER for 1:17-cv-01446, 6:22-cv-00334, and 2:21-cv-06758, and the USPTO PTAB docket for the three IPRs and the 2024 reissue application.

I'll research the PTAB proceedings on this patent. The structured block says ODP shows none, but the patent record itself lists IPRs — let me verify via web search.

Three IPRs surfaced. Let me pin down institution decisions, termination dates, and whether any FWD issued.

PTAB / AIA Trial Proceedings — US 8,170,394 ("Multimedia player displaying operation panel depending on contents")

Canonical-source conflict flagged up front. The structured "PTAB proceedings on file" block states the USPTO ODP AIA-trial feed returns no proceedings for this patent. That is incorrect as a matter of public record. The patent's own Google Patents record, the Unified Patents PTAB case list, and the PTAB filings themselves (Docket Alarm / USPTO PTACTS) establish three IPRs. ODP's AIA-trial dataset appears not to have ingested these (all three terminated by settlement short of a Final Written Decision). I report the three documented proceedings below and flag the ODP gap rather than repeat the "no PTAB activity" default. Proceeding numbers are taken verbatim from the filings; I have not invented any.

Proceedings overview

Three AIA trials on file — all Inter Partes Reviews, all terminated by settlement before a Final Written Decision; zero claims canceled, zero claims sustained, zero decisions on the merits. Breakdown: 0 active, 0 claims invalidated, 0 claims sustained, 3 settled (2 post-institution, 1 post-institution-and-joinder), 0 institution denials. The bottom-line defensive posture is unusual: the patent is not "hardened" and not "dead" — it is UNTESTED. No PTAB panel has ever reached the merits of claims 2–9, so there is no FWD to lean on and no § 315(e)(2) estoppel attaches against any petitioner (estoppel requires a final written decision). What a defendant does get is a published 2019 institution decision finding a reasonable likelihood that all of claims 2–9 are unpatentable — a ready-made roadmap, not a binding judgment.

IPR2019-00089 — BlackBerry Corporation v. Maxell, Ltd.

• Type: Inter Partes Review (pre-AIA §§ 102 / 103(a))
• Filed: 2018-10-15
• Status: Settlement — "Granting Joint Motion to Terminate Proceeding Due to Settlement After Institution" (Paper 15, 2019-04-29). Plain English: instituted, then settled ~1 month later, before any merits decision.
• Judge panel: APJs Lynne E. Pettigrew, Terrence W. McMillin, Jason W. Melvin (McMillin authored both the institution decision and the termination order).
• Petition grounds: Challenged claims 2–9. Grounds were § 102 anticipation by Phillips and § 103(a) obviousness combinations over Phillips in view of Uchida, plus Ackley, Wallis, Russ, and McElhatten as distinct-panel references. BlackBerry's petition framed the art as showing that "the user's operation panel was particular to the currently-displayed screen" and that each of Phillips, Ackley, Wallis, Russ, and McElhatten "provide distinct operation panels that depend on the particular screen before the user."
• Institution decision: Instituted 2019-03-29 (Paper 10) on claims 2–9 on all grounds presented. Reasoning, per the decision: the petition and preliminary response showed "a reasonable likelihood that the petitioner would prevail with respect to at least 1 of the claims challenged," and the Board expressly "institute[d] an inter partes review as to claims 2–9 of the '394 patent on all grounds of unpatentability presented." The Board described the patent as directed to a "digital content reproducing apparatus . . . with a plurality of user operation interfaces, e.g., a linear content operation panel and an interactive content operation panel."
• Final Written Decision: None issued. The Board stated: "We have not yet decided the merits of this proceeding, and a final written decision has not been entered."
• Settlement / termination: Joint motion filed 2019-04-23; granted 2019-04-29. Settlement agreement (Ex. 1022) filed and kept business confidential under 35 U.S.C. § 317(b) / 37 C.F.R. § 42.74(c) — terms are confidential. The settlement resolved the parallel D. Del. case (Maxell, Ltd. v. BlackBerry Corp., No. 1:17-cv-01446), which was dismissed 2019-04-22.
• Appeal: None — no FWD, nothing to appeal.
• Defensive value: Highest-value artifact among the three. Its institution decision is the only published PTAB merits assessment of claims 2–9, and it found a reasonable likelihood on all grounds. A current defendant can cite it as persuasive (non-binding) authority that claims 2–9 are weak over Phillips/Uchida-led art — but it carries no estoppel and no preclusive weight, because the trial dissolved by settlement.

IPR2022-01348 — Motorola Mobility LLC v. Maxell, Ltd.

• Type: Inter Partes Review
• Filed: 2022-08-18
• Status: Settlement — terminated as to Motorola Mobility LLC on 2023-07-07 (Paper 25, "Order Settlement as to Motorola Mobility LLC"), proceeding continued with VIZIO as substituted/joined petitioner, then terminated in full on 2023-09-13 (Paper 37).
• Judge panel: APJs Terrence W. McMillin, Kevin C. Trock, Jason W. Melvin (per the 2023-07-07 order; McMillin authored).
• Petition grounds: Challenged claims 2–9 (same claim set as the BlackBerry and VIZIO petitions). Grounds mirrored the BlackBerry art set (Phillips, Wallis, Ackley, Russ, McElhatten, Uchida); Motorola relied on the BlackBerry institution decision (IPR2019-00089, Paper 10) as Ex. 1020.
• Institution decision: Instituted 2023-02-24. (Beyond the date, I could not retrieve the panel's institution reasoning from the sources available — I won't fabricate it.)
• Final Written Decision: None issued. The Board confirmed in the Motorola settlement order that no FWD had been entered.
• Settlement / termination: Joint motion to terminate filed 2023-06-23 (Paper 22) with a confidential license agreement (Ex. 1021) resolving the matter; granted as to Motorola 2023-07-07. Separately, VIZIO, Inc. was joined as a petitioner on 2023-07-06 (via its petition/motion for joinder in IPR2023-00316); the proceeding continued against VIZIO until the 2023-09-13 full termination. All settlement terms confidential (§ 317(b)).
• Appeal: None.
• Defensive value: Confirms a second and third sophisticated defendant (Motorola/Lenovo, then VIZIO) independently concluded claims 2–9 were vulnerable enough to institute—then bought licenses instead of litigating to judgment. The absence of a merits ruling means the patent owner has never been told "no"; a would-be IPR petitioner faces fresh, unstayed art with no estoppel against it.

IPR2023-00316 — VIZIO, Inc. v. Maxell, Ltd.

• Type: Inter Partes Review
• Filed: 2023-03-03
• Status: Settlement — instituted and joined into IPR2022-01348 on 2023-07-06; terminated by settlement 2023-09-13.
• Judge panel: Not confirmed in the sources retrieved (the joinder/institution order was issued into the IPR2022-01348 file as Paper 24). I decline to state a panel I cannot verify.
• Petition grounds: Challenged claims 2–9. Petition grounds were § 102/§ 103 over Phillips (U.S. 7,293,276), Wallis (US 2005/0188408), Ackley (U.S. 8,112,711), Russ (U.S. 8,181,205), McElhatten (U.S. 7,073,189), Uchida (U.S. 8,773,360), with secondary references including Phillips '123, Tanaka, Sony "Digital Dreams," Apple Macintosh Human Interface Guidelines, a 1988 IEEE window-manager taxonomy paper, a 1990 CACM "Compuvision or Teleputer" article, and ARIB TR-B14 (the Japanese terrestrial digital broadcasting operational guideline). The petition expressly cross-referenced the BlackBerry institution decision (Ex. 1020) and the Motorola petition (Ex. 1021) — i.e., a coordinated follow-on attack.
• Institution decision: Institution plus grant of joinder, 2023-07-06 — VIZIO was joined into the already-instituted IPR2022-01348 rather than run as a standalone trial.
• Final Written Decision: None issued.
• Settlement / termination: 2023-09-13, contemporaneous with the ITC settlement that ended Certain Smart Televisions, Inv. No. 337-TA-1338 (Commission terminated the investigation on settlement 2023-09-22; notice published / vote 2023-09-22–25). Terms confidential. The ITC complaint had asserted claims 2, 4, 5, 7, and 8 of the '394 patent.
• Appeal: None.
• Defensive value: Shows the assert-and-settle pattern. VIZIO started as an IPR petitioner and a co-petitioner, then took a license. A new defendant cannot rely on VIZIO's petition as an adjudicated invalidity; it can only mine the art set (which is now substantially public via the filed petition exhibits).

Strategic summary

Claim status — which claims of '394 are canceled vs. sustained vs. untested. No claim of US 8,170,394 has been canceled and none has been sustained on the merits, because no PTAB proceeding ever produced a Final Written Decision. All three IPRs were terminated by settlement after institution. Concretely:

• Claim 1 — the appreciation-term claim (judge whether contents are linear vs. interactive and determine an appreciation term, then flip the panel per the term) — was never challenged. All three petitions targeted claims 2–9 only. Claim 1 is UNTESTED at the PTAB and, notably, was not among the claims Maxell asserted in the ITC '394 chart (the ITC pleadings asserted claims 2, 4, 5, 7, 8).
• Claims 2–9 — the alternative-panel / mutually-distinct-buttons claims — were challenged three separate times, but each time settled out before judgment. They are UNTESTED on the merits, though a Board panel found a reasonable likelihood they are unpatentable in 2019 (IPR2019-00089).
• Independent claims: claims 2 and 4 and 7 are the mirror-image independent claims (claim 2 = "distinct panels not generated by disabling buttons"; claim 4 = "buttons mutually different"; claim 7 = buttons "producing mutually differing functions"). Claim 1 is the sole independent claim never attacked.

Estoppel landscape. Because § 315(e)(2) estoppel is triggered only by a final written decision, and none issued here, no statutory estoppel bars BlackBerry, Motorola/Lenovo, or VIZIO (or their privies) — and, more importantly for a new defendant, nothing about these proceedings limits the art you may raise. Every ground is still available: § 102 anticipation, § 103 obviousness, and even the same references (Phillips, Wallis, Ackley, Russ, McElhatten, Uchida) that the Board already found reasonably likely to invalidate claims 2–9. The practical constraint is not estoppel but discretionary denial risk: with three prior settled IPRs and co-pending/related ITC and district-court matters, a new petitioner should expect the Board to weigh § 314(a)/Fintiv-style and General Plastic factors (follow-on petitions, prior settlements). Expect the panel to press the petitioner on why it isn't a serial attack — but since the earlier trials never reached the merits, there is no merits-preclusion to overcome.

Pattern signals. (1) Repeat, coordinated petitioners, no repeat victor: three different accused-infringer groups (BlackBerry 2018; Motorola/Lenovo 2022; VIZIO 2023) filed IPRs on claims 2–9, and each was instituted — every petition survived the § 314 threshold. That is a strong tell that claims 2–9 are institutionally weak. (2) Patent owner pursued PTAB appeals — none. Maxell never had a PTAB merits loss to appeal here, and Maxell has not appealed any of these three (nothing to appeal). (3) No defensive aggregator: none of the three was a Unified Patents / RPX-style proceeding; these were real-party accused infringers (BlackBerry, Motorola Mobility, VIZIO) — litigation-driven, not crowd-sourced invalidity. (4) Two watch items: a reissue application was filed 2024-04-19 (Legal Events, code RF), and the patent sits in a large, still-growing continuation family (US 9,489,985; 9,743,129; 11,470,379; 11,812,091; 11,924,502; 11,974,007; 11,974,008; 12,219,202; 12,634,547). A reissue could be an attempt to shore up the claims — flag it, because reissue can also narrow claims and create new prosecution-history estoppel.

Litigation context (not PTAB, but it frames the assertion posture). The '394 patent has been asserted in: Maxell v. BlackBerry, D. Del. No. 1:17-cv-01446 (settled/dismissed 2019-04-22); ITC Inv. No. 337-TA-1312 (Lenovo/Motorola mobile devices); ITC Inv. No. 337-TA-1324 (Lenovo/Motorola) — the '394 investigation was terminated 2023-05-15 on complainant's withdrawal, and the overall investigation ended on settlement 2023-08-18; Maxell v. Lenovo, W.D. Tex. No. 6:22-cv-00334 (stayed pending the ITC); and ITC Inv. No. 337-TA-1338 (VIZIO smart TVs) — terminated on settlement 2023-09-22, asserting claims 2, 4, 5, 7, 8 of '394. The structured block's listing of an ITC investigation "337-TA-3643" is anomalous — I could not corroborate that number, and I flag it rather than treat it as real.

Recommended next steps

• If you are a defendant facing assertion of '394: lead your invalidity case with the BlackBerry institution decision, IPR2019-00089, Paper 10 (2019-03-29), which instituted on claims 2–9 on all grounds. Link: https://www.docketalarm.com/cases/PTAB/IPR2019-00089/Inter_Partes_Review_of_U.S._Pat._8170394/04-29-2019-Board/Termination_Decision_Document-15-Termination_Decision_Document/ (and the institution decision, Paper 10, in the same file). Quote the operative language: "We institute an inter partes review as to claims 2–9 of the '394 patent on all grounds of unpatentability presented." Because no FWD issued, this is persuasive only — do not represent it as a holding.
• Do not assume prior IPRs block you — they don't. With no FWD, no § 315(e)(2) estoppel attaches; the full § 102/§ 103 art set (Phillips, Wallis, Ackley, Russ, McElhatten, Uchida, plus secondary art) remains fair game. Copy the VIZIO petition's exhibit list (IPR2023-00316, filed 2023-03-03) as your art roadmap; it is public.
• Budget for a discretionary-denial fight. Three prior IPRs plus ITC/docket history will draw § 314(a) / General Plastic scrutiny. Pre-empt it: emphasize that no ground was ever adjudicated, that claim 1 has never been tested, and that your art and arguments materially differ/advance beyond the prior petitions.
• Watch the reissue. A reissue application was filed 2024-04-19. Monitor the reissue prosecution for claim amendments; a reissued claim set could reset your invalidity analysis and introduce new estoppel.
• If you are evaluating a design-around instead of invalidity: the asserted independent claims are 2, 4, and 7 (and their dependents 3, 5–6, 8–9), with claim 3/6/9 adding the "common in size, switched in the same panel rendering area" limitation. Claim 1 (appreciation-term logic) is untested and worth independent scrutiny, since no PTAB panel has ever construed it.
• No active proceedings to track. There are currently no pending AIA trials on '394 — all three settled. There is therefore no institution deadline, no oral hearing, and no statutory FWD date to monitor. I found no Federal Circuit appeals from any '394 PTAB proceeding (the only Maxell Federal Circuit decision surfaced, Maxell v. Amperex, No. 23-1194 (Fed. Cir. 2024-03-06), concerns the unrelated '035 battery patent and is not about '394).

Caveats / confidence. High confidence on: the existence, petitioner identities, filing dates, institution dates, panels, settlement terminations, and the absence of any FWD or appeal. Lower confidence on: (a) the exact citation-by-citation breakdown of Motorola's and VIZIO's statutory grounds and the full reference set, which I reconstructed from petition exhibit lists and cross-references rather than from the pleadings' full text; (b) the IPR2023-00316 institution panel; and (c) the exact institution reasoning in IPR2022-01348. I have specifically not attributed any merits ruling to any claim, because no merits ruling exists. Sources: Unified Patents PTAB case list (https://portal.unifiedpatents.com/ptab/caselist?patent.patent_number=[8170394](/patent/8170394)), Docket Alarm (IPR2019-00089, IPR2022-01348, IPR2023-00316 files), USPTO PTACTS, and USITC notices for 337-TA-1324 and 337-TA-1338. Live PTAB E2E access is at https://ptacts.uspto.gov; the ODP AIA-trial dataset otherwise used for the structured block is missing all three of these proceedings and should not be relied on as the sole source here.

I'll verify the litigation and ownership context with a couple of targeted searches before writing this up.

Let me check how third-party NPE trackers characterize Maxell, since that directly drives signal #2.

One more check — Assignment Center reel/frame records sometimes surface the recording correspondent on third-party mirrors.

US 8,170,394 B2 — Ownership & Assignment Reconstruction

Provenance note (read first). The reel/frame numbers, conveyance types and execution/recording dates below are taken from the USPTO assignment data as mirrored in the Google Patents "Legal Events" record for US8170394B2. The correspondent-of-record field you asked me to capture is not exposed in that mirror, and my attempts to retrieve it from third-party assignment mirrors returned only an assignee-side attestation signature, not a recording correspondent. I have flagged that gap explicitly in the timeline below rather than guessing. A direct Assignment Center query on patent number 8170394 is required to complete the correspondent column — this is the one field in your requested output I could not ground.

Inventors

• All three are listed as assignors on the sole inventor-side assignment, executed 2006-08-25 through 2006-08-29 and recorded 2006-10-25 at reel 018455/0214. The execution dates are 2–6 days after the 2006-08-23 US filing date — i.e., the application was filed first and the formal assignment paperwork followed within the week. That is ordinary large-corporate practice, not a red flag.
• Pattern assessment: nothing unusual. All three inventors are names of a single employer (Hitachi, Ltd.), all signed the same cover sheet within a five-day window, and there is no second inventor-side assignment, no inventor-to-third-party record, and no inventor quitclaim anywhere in the chain. The "all inventors departed within 12 months" precursor to a fire-sale does not appear — there are simply no further inventor-side records to evidence any departure either way. Departure data is not determinable from assignment records.
• Contextual note (attributed, not asserted for this patent): contemporaneous Hitachi filings of the same era list inventor correspondence addresses as "c/o Hitachi, Ltd., Intellectual Property Group, 6-1 Marunouchi 1-chome, Chiyoda-ku, Tokyo 100-8220." I could not confirm that address on the '394 record itself.

Original assignee

Hitachi, Ltd. (Tokyo, Japan) — named as applicant/assignee at filing and on the issued patent.

• Did they ship a product embodying the claims? Yes, in the relevant era. The specification itself targets "a conventional digital broadcasting compatible HDD/DVD decoder," and Hitachi manufactured digital-broadcast-compatible HDD/DVD recorders and TVs in this window. This is a genuine operating-company-origin patent, not a paper filing.
• Primary line of business: diversified electronics and heavy industry (consumer electronics, storage media, power/industrial systems).
• Current status of this IP: Hitachi, Ltd. still operates (TSE Prime 6501), but it no longer owns this patent. Hitachi carved its consumer-product-facing IP out to Hitachi Consumer Electronics Co., Ltd. and that entity transferred the portfolio to Hitachi Maxell, Ltd. Maxell's own pleadings describe the carve-out as an effort "to align its intellectual property with the licensing, business development, and research and development efforts of Maxell" (Maxell, Ltd. v. [Apple Inc.](/litigations/by-plaintiff/Apple%20Inc.), No. 6:20-cv-00646 (W.D. Tex.) ¶ 4; same recital in Maxell, Ltd. v. ZTE Corp., No. 5:18-cv-00034 (E.D. Tex.) ¶ 4).

Assignment timeline

Six recorded ownership links, all intra-group. No assignment to a third party, no security interest, no license record, and no release appears anywhere in the chain.

• 2006-08-25 to 2006-08-29 (executed) / recorded 2006-10-25 — Reel 018455/0214

  • Conveyance: Assignment (original, inventor-to-employer)
  • Assignor: Machida, Yoshihiro; Tsutsumi, Nobuhiro; Kamogawa, Kouji
  • Assignee: Hitachi, Ltd.
  • Correspondent: not exposed in the retrieved record — Assignment Center query required. (Recording was handled on Hitachi's side; no third-party filer appears.)
  • Context: Initial employment assignment; standard employee-to-corporation transfer days after filing.

• 2013-06-07 (effective) / recorded 2013-06-12 — Reel 030648/0217

  • Conveyance: Assignment
  • Assignor: Hitachi, Ltd.
  • Assignee: Hitachi Consumer Electronics Co., Ltd.
  • Correspondent: not exposed in the retrieved record.
  • Context: Internal corporate restructuring — carve-out of consumer product-facing IP ahead of Hitachi's consumer electronics separation.

• 2014-08-26 (effective) / recorded 2014-09-08 — Reel 033694/0745

  • Conveyance: Assignment (portfolio transfer)
  • Assignor: Hitachi Consumer Electronics Co., Ltd.
  • Assignee: Hitachi Maxell, Ltd.
  • Correspondent: not exposed in the retrieved record. (Assignee field on this record duplicates the assignor name — "HITACHI CONSUMER ELECTRONICS CO., LTD." twice — a USPTO cover-sheet/recording-clerk artifact, not a substantive defect.)
  • Context: Bulk portfolio carve-out into a Hitachi affiliate positioned as the group's IP licensing and business-development vehicle. This was a blanket, multi-thousand-patent recording, not a patent-by-patent deal.

• 2017-10-01 (effective) / recorded 2018-01-25 — Reel 045142/0208

  • Conveyance: Assignment
  • Assignor: Hitachi Maxell, Ltd.
  • Assignee: Maxell, Ltd.
  • Correspondent: not exposed as a correspondent field. However, this reel/frame is confirmed as a blanket portfolio recording: a 37 C.F.R. § 3.73(b) chain-of-title statement in the prosecution file of a different Maxell patent (application 14/478,020, "Recording and Reproducing Apparatus") cites "Reel 045142, Frame 0208" and is attested only by a signatory rendered as "/John R." (see IPR2024-00867 Ex. 1003). That is an assignee-side attestation signature, not the recording correspondent of record — I am not treating it as the correspondent you asked for. Flag for Assignment Center verification, since a single recurring attestation signer across a licensing-program portfolio is exactly the kind of tell your methodology targets.
  • Context: Intra-group transfer accompanying Hitachi Maxell's rebranding to "Maxell, Ltd." — internal reorg, not a monetization event.

• 2021-10-01 (effective) / recorded 2021-11-29 — Reel 058255/0579

  • Conveyance: Merger
  • Assignor: Maxell, Ltd.
  • Assignee: Maxell Holdings, Ltd.
  • Correspondent: not exposed in the retrieved record.
  • Context: Holding-company reorganization by merger — change of corporate form only.

• 2021-10-01 (effective) / recorded 2021-12-03 — Reel 058666/0407

  • Conveyance: Change of Name
  • Assignor: Maxell Holdings, Ltd.
  • Assignee: Maxell, Ltd.
  • Correspondent: not exposed in the retrieved record.
  • Context: Name change reversing the merger step so the operating entity again bears "Maxell, Ltd." No change in beneficial ownership.

Adjacent, non-ownership filing (do not read as an assignment): effective 2024-04-19 / recorded 2024-05-21 — code RF, "Reissue application filed." A reissue of a patent granted 2012-05-01, filed ~12 years post-grant and while the patent was in active multi-front assertion. It is not an ownership link but it is analytically relevant: reissue practice is a common means of shoring up claims mid-campaign.

Date discrepancy worth flagging. Maxell's pleadings date the Hitachi carve-outs to 2009 (Hitachi → Hitachi Consumer Electronics) and 2013 (Hitachi Consumer Electronics → Hitachi Maxell). The USPTO records for this patent show effective dates of 2013-06-07 and 2014-08-26. The business transactions and their recording dates do not line up; the "2009" step is not separately recorded against the '394, meaning the '394 either moved later in the program or was recorded only when the second step was papered. This matters if anyone relies on pleadings rather than reel/frame for a priority-of-title analysis.

Timeline diagram

timeline
    title Ownership of US 8170394
    2005 : JP priority filing 2005-08-30
    2006 : US filing 2006-08-23
         : Inventors assign to Hitachi Ltd
    2012 : Patent granted 2012-05-01
    2013 : Hitachi Ltd to Hitachi Consumer Electronics
         : Reel 030648 0217
    2014 : Hitachi Consumer Electronics to Hitachi Maxell
         : Reel 033694 0745
    2017 : Hitachi Maxell to Maxell Ltd
         : First suit filed against BlackBerry
    2018 : Reel 045142 0208 recorded
    2021 : Merger into Maxell Holdings
         : Name change back to Maxell Ltd
    2022 : Asserted at ITC and W D Tex
         : Targets Lenovo and Motorola and Vizio
    2024 : Reissue application filed

NPE / troll-pattern signals

1. Shell-entity transfer — not present. Every assignee in the chain is a real, named Japanese corporate entity in the Hitachi/Maxell group: Hitachi, Ltd.; Hitachi Consumer Electronics Co., Ltd.; Hitachi Maxell, Ltd.; Maxell Holdings, Ltd.; Maxell, Ltd. No LLC, no "IP/Licensing/Ventures" suffix, no registered-agent address, no Delaware or Texas single-purpose vehicle. Reels 018455/0214 → 058666/0407 contain zero shell steps. This is the strongest negative finding in the analysis.

2. Known asserter in the chain — present (qualified). The enumerated lists (Acacia, Marathon, IV, IPNav, Wi-LAN, Mosaid/Conversant, Vringo, Pendrell, Innovatio, MPHJ, Lumen View, Round Rock, Document Generation, Spangenberg entities) do not include Maxell. However, the Stanford NPE Litigation Database classifies Maxell as "Non Practicing Entity" in Maxell Ltd. v. [[Samsung Electronics Co.](/litigations/by-defendant/Samsung%20Electronics%20Co.) Ltd.](/litigations/by-plaintiff/Samsung%20Electronics%20Co.%20Ltd.), No. 5:25-cv-00097 (E.D. Tex.) (record). Maxell is a demonstrably high-volume plaintiff on this family: ITC Inv. Nos. 337-TA-1312, 337-TA-1324, 337-TA-1338 (Vizio, smart TVs), 337-TA-1432 (Samsung) and district cases 1:17-cv-01446 (D. Del., BlackBerry), 6:22-cv-00334 (W.D. Tex., Lenovo/Motorola), plus Apple and ZTE actions. Counter-evidence to note honestly: Unified Patents' litigation data tags Maxell as "Operating Company" for at least one case (5:25-cv-00052), and Maxell is a TSE Prime-listed manufacturer (¥129.4B FY2025 revenue) that does sell products. Also note: the ITC identifier 337-TA-3643 shown on the Google Patents litigation panel does not fit the numbering sequence of the other Maxell investigations and is not otherwise indexed — treating it literally, I flag it as a probable source-data artifact.

3. Repeat correspondent across the chain — unclear / not retrievable. No correspondent field is exposed for any of the six records, so I cannot state whether one attorney or firm handled all recordings, nor whether that name recurs on Unified Patents / RPX / Patent Progress assertion lists. The only near-signal found is a § 3.73(b) attestation rendered only as "/John R." on the reel 045142/0208 blanket assignment (see IPR2024-00867 Ex. 1003) — an assignee-side signer, not a correspondent. Per your methodology this is not yet a finding. If a single such signer/agent appears across the family's recordings and on Maxell's assertion paperwork, that is where the recurrence signal would land. Requires Assignment Center.

4. Cascading transfers — not present. Six links over fifteen years (2006 → 2021). The tightest spacing is reel 030648/0217 (eff. 2013-06-07) to reel 033694/0745 (eff. 2014-08-26) — ~14.5 months — but both are Hitachi-group reorganizations of an operating conglomerate, not chained LLCs, and the assignees share a corporate parent rather than a correspondent address. Fails every element of the signal.

5. Pre-litigation transfer — not present. The last ownership record is a 2021-12-03 change of name (effective 2021-10-01, reel 058666/0407), and the earliest assertion of the '394 is the BlackBerry action, No. 1:17-cv-01446 (D. Del., 2017 by case number). Ownership records precede the litigation by years, and none was executed inside six months of a first suit. The 2017-10-01 effective date on reel 045142/0208 is roughly contemporaneous with the BlackBerry filing but is a name change/rebrand, not a standing- or venue-driven transfer.

6. Bankruptcy fire-sale — not present. No Chapter 7/11, no § 363 sale, no receiver or trustee appears in any of the six records.

7. Privateering — unclear. There is a real structural resemblance and I want to state it plainly: Hitachi separated its consumer product-facing IP from the businesses that made the products, and Maxell now enforces that IP against the TV and mobile-device makers that were Hitachi's competitors — Vizio, Samsung, Lenovo/Motorola, and previously Apple and ZTE. Maxell's complaints also reference an external "licensing agent" (in the Apple action, Alan Loudermilk of Marshall, Texas) and state that Maxell has licensed "a majority of the industry." But there is no evidence of a Maxell–Hitachi agency or revenue-share arrangement, no SEC disclosure of Hitachi retaining an economic interest, and no coverage characterizing Hitachi as directing the campaign. On the record available, this is an intra-group portfolio monetization that patterns like privateering, not proof of one. Unclear.

8. Defensive aggregator — not present. Nothing in the chain terminates at RPX, AST, LOT Network, Unified Patents, or OIN. The patent is live, asserted, and reissue-maintained (adjusted expiration 2030-08-04), and the family has been kept alive through nine US applications with issuance running into 2026 (the latest family member, US12634547B2, carries a 2026-05-19 publication date) — the opposite of neutralization.

Verdict

NPE — moderate confidence.

The chain itself is clean: six intra-group records (018455/0214 → 030648/0217 → 033694/0745 → 045142/0208 → 058255/0579 → 058666/0407), no shell LLCs, no fire-sale, no pre-litigation transfer, no defensive aggregator — so this is not a fabricated-troll chain and a high-confidence NPE call would be unsupportable. The moderate call rests on one strong signal plus a structural one: Maxell, Ltd. is classified as a non-practicing entity by the Stanford NPE Litigation Database and has run a sustained, multi-front assertion campaign on the '394 and its continuations against smart-TV and mobile-device makers that make products Maxell itself no longer makes in those categories, with the patent having been severed from the product business that originated it (reels 030648/0217 and 033694/0745) and reissue-maintained in 2024 while in suit. The two items that would move this to high confidence — recurring recording correspondent and evidence of an economic arrangement with Hitachi — are precisely the two I could not ground from the available records.

Verify at: USPTO Assignment Search — patent 8170394 (Assignment Center, https://assignmentcenter.uspto.gov/) to pull the correspondent-of-record for reels 018455/0214, 030648/0217, 033694/0745, 045142/0208, 058255/0579, 058666/0407; cross-check against Google Patents legal events.

I'll research this patent and its cited prior art. Let me run several searches.

Let me research the key cited references in detail.

Let me get details on the key Japanese references and a few more cited US references.

Prior-Art Analysis — US 8,170,394 B2

Analyst note on methodology & sourcing. I interpreted the identifier literally as US 8,170,394 B2 (no other number). Confirmed bibliographic data below comes from the authoritative full text supplied (Google Patents mirror of the USPTO record) plus targeted web verification. Where a limitation of the claims cannot be tied to a reference with confidence, I say so rather than infer. I could not retrieve substantive content for a few of the more remote references before exhausting my tool budget; those are flagged.

1. The patent under analysis

Claim landscape (the target of any §102 analysis):

• Claim 1 — the narrow, "smart" claim. Requires a data monitor that both (a) judges whether the content is linear or interactive and (b) determines an appreciation term, then displays one of two panels per a deliberately counter-intuitive four-way mapping: linear + within term → interactive panel; linear + out of term → linear panel; interactive + within term → linear panel; interactive + out of term → interactive panel.
• Claim 2 — apparatus claim: input unit, reproducer, output unit, display showing the content together with an alternative display of either a linear panel or an interactive panel, the two being distinct panels "which are not generated by a disabling of buttons," with only one displayed exclusively at a time, concurrently on one screen.
• Claim 3 — depends on 2: the two panels are common in size and switched in the same panel rendering area.
• Claim 4 — like claim 2 but reciting buttons of the linear panel mutually different from buttons of the interactive panel.
• Claim 5 — depends on 4: all buttons mutually different.
• Claim 6 — depends on 4: common size / same panel rendering area.
• Claim 7 — like claim 2 but reciting functions of the linear-panel buttons mutually differing from the interactive-panel buttons.
• Claim 8 — depends on 7: all button functions mutually differing.
• Claim 9 — depends on 7: common size / same panel rendering area.

Critical framing. Every reference below was listed on the face of the '394 patent, and the asterisked entries were cited by the examiner ("* cited by examiner" in the Google Patents tables). Because the patent issued with these claims intact, the examiner necessarily did not treat any one of them as a complete §102 anticipation of claim 1. My §102 mappings below are therefore hypotheses a challenger could raise, not settled findings. For most references the realistic theory is §103 (obviousness), not §102 (anticipation) — §102 requires every limitation in a single reference.

2. Prior art cited on the face of US 8,170,394

Tier 1 — Closest to the inventive concept

1. JP 2005-073022 A (NHK), "Broadcast receiving device, remote control device, remote control method and remote control program"

• Priority 2003-08-26; published 2005-03-17. Assignee: Nippon Hoso Kyokai (NHK). Cited in the '394 specification by name (JP-A-2005-73022).
• Description: Provides a user with illumination/indication of a usable remote-control key according to digital-content information. This is the reference the '394 background expressly distinguishes: it "is required to mount all keys … so that a remote controller having a large area is used."
• Potential §102 vs. claims: None anticipated. JP 2005-073022 teaches the opposite of the core claim-2 negative limitation — it illuminates/keeps all keys and merely disables or dims the unusable ones, rather than presenting two distinct, non-overlapping panels "not generated by a disabling of buttons." It is the single most probative §103 background reference but is not a §102 reference for any issued claim. (URL: https://patents.google.com/patent/JP2005073022A/en)

2. JP 2005-006144 A (Fujitsu / Suda et al.), "Control method for interactive program viewing device, control method for interactive remote control device, and interactive program viewing device"

• Filed 2003-06-13; published 2005-01-06. Listed in the "Non-Patent Citations" as a machine-generated translation of JP 2005-006144 to Suda et al., Jun. 2005 — i.e., the examiner relied on this reference in translation.
• Description: Addressing control of interactive program viewing devices and a companion interactive remote-control device — i.e., the same linear-vs-interactive control problem space.
• Potential §102 vs. claims: The examiner's reliance on this translation suggests it was seen as disclosing the "interactive content operation panel / interactive-function control" side of claim 1 and claims 2/4/7. It is the strongest candidate for a §102 challenge to the structural claims (2, 4, 7) if it shows two exclusive, alternate operation panels with different buttons/functions displayed with content. It is very unlikely to read on claim 1, because there is no indication (and the specification gives none) that it monitors an appreciation term or implements the four-way mapping. Caveat: I was unable to independently pull the JP 2005-006144 A text; the above is inference from the citation role, and should be verified against the actual document.

3. EP 1,376,321 A1 (Fujitsu), "Interactive content presenting device and method"

• Priority 2001-03-28; published 2004-01-02.
• Description: Apparatus/method for presenting interactive content — a direct analogue to the "interactive content operation panel" function.
• Potential §102 vs. claims: Potentially relevant to the interactive-panel element of claims 1/2/4/7, but as an interactive-content presentation teaching it does not by itself supply the alternative, exclusive pair of panels nor the appreciation-term logic. §103 material.

4. US 2005/0188408 A1 (Wallis et al.), "Non-linear interactive video navigation"

• Filed 2003-10-22; published 2005-08-25 (before the 2005-08-30 priority date — §102(a)/(b) eligible).
• Description: Interactive video navigation with a non-linear control presentation layered on video.
• Potential §102 vs. claims: Relevant to the claim-2/4/7 concept of a control interface displayed concurrently with reproduced content and switching between control presentations. Being an "interactive video navigation" reference it plausibly shows one control presentation at a time with the content. It does not appear to disclose the linear-vs-interactive pair as mutually exclusive panels of common size (claim 3/6/9), and it is silent on appreciation terms. Likely a §103 reference, not §102 for claim 1. (Could not fully verify its disclosure before tool budget was exhausted.)

5. US 7,595,846 B2 (Moon / LG Electronics), "Bi-directional remote controller and data broadcasting guidance system and method using the same"

• Priority 2002-11-29; granted 2009-09-29.
• Description: Bi-directional remote controller with a data-broadcasting guidance function — squarely in the data-broadcast/interactive-content control space.
• Potential §102 vs. claims: Relevant to the interactive/data-broadcast control panel element and to switching control presentations. Not a teaching of the appreciation-term determination or the four-way mapping; §103 candidate for claims 2/4/7. Dates: its 2002 priority predates the '394 priority, so it is §102(a)/(b) eligible on its US publication.

6. US 7,174,518 B2 (Kim / LG Electronics), "Remote control method having GUI function, and system using the same"

• Priority 2001-10-11 (KR 2001-62645); filed 2002-10-10; granted 2007-02-06. (A co-pending continuation published as US 2007/0106945 A1.)
• Description: Remote controller with touch pad driving a GUI on a digital television; digital TV distinguishes a button-signal mode from a touch-pad-signal mode and switches the on-screen GUI accordingly (menu-selection window displayed in GUI environment).
• Potential §102 vs. claims: Most relevant to the mode-dependent switching of the on-screen control presentation (claims 2/4/7) and to displaying a control interface concurrently with content. The switching trigger in Kim is a remote-control mode change, not a judgment of linear-vs-interactive content and not an appreciation term — so it does not anticipate claim 1. §103 material.

Tier 2 — Related control/navigation and interactive-TV art

Tier 3 — Remote / general-environment art (remote buttons, GUIs, EPGs, media relocation)

These are the classic "all keys on a remote / generic GUI" references. They are cited for completeness and to frame the field, but each is further from the claims than Tier 1–2.

3. Bottom-line §102 assessment

• Claim 1 is the differentiator and is very likely patentable over every listed reference individually. No cited reference contains all four of (i) a data-monitor that judges linear-vs-interactive, (ii) a determination of an appreciation term, and (iii) the specific four-way, cross-swapped panel mapping. The "appreciation term" concept is precisely the feature the specification presents as the fix for stale data-broadcast content (news, weather). The strongest §102 arguments a challenger could mount are against the broader structural claims (2, 4, 7) and their dependents (3, 5, 6, 8, 9) using JP 2005-006144 (Suda) or US 2005/0188408 (Wallis) — each of which could arguably show alternative, mutually exclusive control presentations rendered with content. Even there, the negative limitation "distinct panels … not generated by a disabling of buttons" is a deliberate drafter's hedge against the JP 2005-073022 (NHK) and generic "disable-the-unusable-keys GUI" art, so §102 on that limitation is a hard sell against those references.
• Realistic challenge theory is §103, not §102. The examiner-cited set (JP 2005-073022 + JP 2005-006144 + EP 1,376,321 + US 7,595,846 + US 7,174,518) reads as an obviousness combination directed at "monitor content information and swap the on-screen control panel," with the appreciation-term logic supplying the non-obvious hook.
• Verification gaps. I did not independently retrieve the full text of JP 2005-006144 A, US 2005/0188408 A1, or EP 1,376,321 A1 within the tool budget; their mappings above are inference from title/role and should be confirmed against the documents before any formal validity opinion. The dates and titles for all references are taken from the '394 face-of-patent citation tables (USPTO-derived).

4. Litigation / validity context (USPTO records)

US 8,170,394 has been repeatedly challenged and asserted (source: https://portal.unifiedpatents.com/[ptab](/ptab)/caselist?patent.patent_number=[8170394](/patent/8170394)):

• IPR2019-00089 — petitioner BlackBerry Corp./BlackBerry Ltd., filed 2018-10-15; settled (terminated 2019-03-29).
• IPR2022-01348 — petitioner Motorola Mobility LLC / Lenovo, filed 2022-08-18; settled (terminated 2023-07-06).
• IPR2023-00316 — petitioner Vizio, Inc., filed 2023-03-03; settled (terminated 2023-07-06).
• District court: Maxell v. BlackBerry et al., D. Del. 1:17-cv-01446; Maxell v. (Lenovo), W.D. Tex. 6:22-cv-00334.
• ITC §337 investigations referencing the patent: 337-TA-1312, 337-TA-1324, 337-TA-1338 (and 337-TA-3643).
• A reissue application was filed 2024-04-19 (recorded 2024-05-21).
• The patent is in a large continuing family (e.g., US 9,489,985; US 9,743,129; US 11,470,379; US 11,812,091; US 11,924,502; US 11,974,007; US 11,974,008; US 12,219,202; US 12,634,547), all claiming 2005-08-30 priority.

Caveat: The IPR settlements mean the PTAB never issued a final written decision on validity; they do not indicate the claims are valid or invalid. The reissue filing means the claim set may change, which would re-open any §102/§103 analysis against the amended claims.

I'll ground this analysis in the actual prior-art references listed on the patent page. Let me pull details on the key references cited.

Let me pull the remaining key references, particularly those bearing on the "appreciation term"/expiration limitation and panel-switching features.

Obviousness Analysis — U.S. Patent No. 8,170,394 B2

Reference: https://patents.google.com/patent/[US8170394](/patent/US8170394)/en
Title: Multimedia player displaying operation panel depending on contents
App. 11/508,209 · filed 2006-08-23 · JP priority 2005-248576 (2005-08-30) · granted 2012-05-01 · 9 claims · current assignee Maxell, Ltd.

1. Governing framework and critical date

Because App. 11/508,209 was filed before 2013-03-16, pre-AIA 35 U.S.C. § 103(a) governs. The analysis follows Graham v. John Deere (scope/content; differences; PHOSITA level; secondary considerations) as qualified by KSR Int'l v. Teleflex (a combination need not be taught by explicit TSM; predictable use of prior-art elements according to their established functions, and a "design need or market pressure," suffice).

Critical date. The § 102(b) critical date is one year before the U.S. filing — 2005-08-23. Foreign priority (JP 2005-08-30) does not move that date under § 102(b). References published before 2005-08-23 are § 102(b) art; those in the 2005-08-23 → 2005-08-30 window are, at best, § 102(a) art; later-published items must rely on § 102(e) (as of their U.S. filing date) or on a foreign priority date under § 102(a)/(e) principles.

Level of ordinary skill. A PHOSITA here is a set-top/HDD-DVD receiver engineer with knowledge of MPEG-2 transport streams, PSI/PMT descriptors, ARIB TR-B14 data broadcasting and BML, plus conventional GUI/OSD design. All of that is the background the patent itself assumes (Description, "specific digital content monitoring method" passage).

2. The claims, grouped by scope

Two observations that drive the whole analysis:

1. Only claim 1 recites the "appreciation term." Claims 2–9 are dramatically broader: content-type detection, monitoring and term determination are absent. They cover, essentially, swapping one of two purpose-built control panels on a display based on what kind of content is playing. That is the concept the Background section concedes exists in the art ("reproduction keys for linear contents and interactive contents are displayed on a screen and unusable keys are disabled").
2. Claim 1's mapping is, taken literally, non-monotonic. As granted: linear + in-term → interactive panel; linear + out-of-term → linear panel; interactive + in-term → linear panel; interactive + out-of-term → interactive panel. This is a logical XOR of content-type and term-status. I flag it rather than "correcting" it — but note that an arbitrary selection among two display options is the paradigm of a predictable, non-patentable design choice (KSR; MPEP 2144.04), and this peculiar mapping deserves scrutiny in any reissue (a reissue application was filed 2024-04-19, legal-event code RF).

3. The prior-art landscape (as listed on the page)

Dates below are from the page; I have not independently verified every U.S. filing/publication date, and the § 102(e) column should be confirmed before relying on it.

Also of record: three settled IPRs (BlackBerry IPR2019-00089; Motorola/Lenovo IPR2022-01348; Vizio IPR2023-00316) and ITC Investigations 337-TA-1312/1324/1338/3643. Settlements prove nothing about validity; they do show the panel-switching concept drew sustained § 103 challenges.

4. Proposed § 103 combinations

Combination A — Claims 2, 3, 5, 6, 8, 9

Primary: JP-A-2005-73022 (NHK).
The patent's own Background (§ "As described in JP-A-2005-73022…") identifies this reference as teaching monitoring content information and indicating which keys are usable. NHK's claim 2 expressly performs BML content-description-language analysis to decide operability "in data broadcasting," and its claim 3 does the same via program information — i.e., distinguishing data-broadcast (interactive) operation from ordinary program (linear) operation from the content itself. That is the claimed "monitoring information on digital contents … to display only usable operation keys."

Secondary: US 2004/0131335 A1 (Halgas). Supplied the missing piece — rather than merely lighting keys on a full keypad, detect whether interactive content exists and present a correspondingly different, purpose-built interactive interface.

Secondary (motivation + claim 3/6/9): US 7,126,587 B2 (Sharp). Explicitly reasons that keys should be kept at the same position across states "to prevent the user from being confused," and that key types/number change with operation status. That is the express motivation to render the alternative panels as same-size panels in the same rendering area.

Motivation to combine (KSR rationales):

• Recognized design need, stated by the applicant itself. The Background and Summary admit that both key sets must otherwise be mounted/displayed ("a remote controller having a large area is used… a wide operation panel rendering area is used"), and the stated object is a small panel area and a relatively large image area. KSR treats remedying a known design constraint by rearrangement of known elements as obvious.
• Predictable result. Substituting one fixed panel for another in a fixed rectangle is the established function of OSD panels; the patent asserts only improved usability and screen real estate — exactly the "predictable use of prior art elements according to their established functions."
• Articulated anti-confusion rationale from US 7,126,587 supplies the reason the PHOSITA would keep both panels the same size in the same area rather than using differently sized panels.

Combination B — Claims 4, 5 and 7, 8 (buttons mutually different / different functions)

The two key sets are admitted prior art in the patent's own Description: linear panel = play/stop/pause/FF/REW/prev/next; interactive panel = 0–9, up/down/left/right, decide, four color keys. US 7,595,846 (LG) confirms the interactive/data-broadcast set (arrow keys, numeric keys, colored function keys) and, importantly, ties the allowed functions to buttons corresponding to on-screen data-broadcast buttons. NHK's claim 2/3 establishes that the operable set varies with the content. Combining these yields panels whose buttons are mutually different and perform different functions — with an explicit reason (a numeric/color key is meaningless for a linear transport control, and vice versa). Dependent claims 5 and 8 simply require that all buttons differ, which follows directly from using two purpose-built panels rather than one shared, partially disabled panel.

Note on the negative limitation in claim 2 ("not generated by a disabling of buttons"). This limitation was plainly written to escape the patent's own admitted prior art ("unusable keys are disabled") and art like US 7,126,587, which grays out or removes unavailable keys. It raises the drafting burden: a § 103 combination for claim 2 should use a primary reference that shows two separately generated panels, not one panel with suppressed keys. JP-A-2005-006144 (Fujitsu) and US 2004/0131335 (Halgas) are the better primaries for that reason; I could not verify JP '144's disclosure from the page and would not assert its content without the published text.

Combination C — Claim 1 (the only claim with the "appreciation term")

Claim 1 requires (i) judging linear vs. interactive and (ii) determining an appreciation term, then selecting the panel from the combination.

• Element (i): NHK (BML/program-information analysis) + Halgas (internal check for interactive content).
• Element (ii): US 6,055,413 (Motorola) — attaching an origination time and an update lifetime to updateable broadcast messages — or US 7,496,631 (AOL) — delivery governed by a lifespan. Both are closer to the "is this still worth presenting?" question than anything else of record, and Motorola is in the same broadcast-delivery field.
• Motivation: the patent states it itself — data-added broadcasting carries "up-to-date news, weather forecast and the like," which "have a nature of an appreciation term," such that "there arises an issue of a lapse of an appreciation term, when reproduction is made." A PHOSITA confronted with stale recorded news/weather would predictably attach a validity window and gate the interface on it.
• Weaker point for the patentee: because the claim's four-way mapping is an arbitrary XOR, the only non-trivial element is the bare determination of a term — which is the very thing Motorola/AOL already do.

Combination D — Claims 2/4/7 "concurrent in one screen"

US 5,606,374 (IBM) (menu overlaying video), US 6,240,555 (Microsoft) (supplemental interactive content together with continuous video) and US 5,517,257 (Microsoft) (control UI for interactive TV) all show content and a control/supplemental interface concurrently on one screen — squarely covering "displayed concurrently in one screen."

5. Anticipated rebuttals, and why they are weak

1. "JP-A-2005-73022 teaches away." NHK keeps all keys mounted and merely illuminates the usable ones; the patent instead swaps panels. But a reference teaches away only if it criticizes, discredits, or discourages the alternative. Disclosing a different solution is not teaching away (In re Fulton; Medichem). Worse for the patentee: the patent characterizes NHK as deficient ("required to mount all keys… a wide operation panel rendering area is used") — an argument that the improvement is a known design need, i.e., a KSR motivation.
2. "New problem recognized." The patent's insight — that the user shouldn't have to scrutinize a wide panel — is problem recognition, which KSR holds insufficient absent an unobvious solution.
3. Secondary considerations. The patent discloses no unexpected-results data. Its stated benefits (fewer keys, shorter mouse travel, larger image area) are the inherent, predicted consequences of a smaller panel and are more naturally attributed to design choice. A § 103 challenge should expect the patentee to assert commercial success/licensing (the Maxell family has been litigated and licensed broadly), which would then require a nexus showing.

Where the patent is genuinely most defensible: claim 1's specific combined gating logic (panel selection keyed to both content type and term status) is not squarely shown by any single reference of record, and the exact four-way mapping is idiosyncratic. But since claims 2–9 omit the term entirely, the commercially asserted scope almost certainly rests on the broad panel-switching claims — where the prior art of record (NHK + Halgas + Sharp + LG, plus the applicant's own admissions about "linear" vs. "interactive" key sets existing and about disabling unusable keys) is dense.

6. Confidence and limitations

• Verified by retrieval: NHK JP-A-2005-73022 abstract/claims; JP 4206315 B2; US 2004/0131335 A1; US 7,595,846 B2; US 7,126,587 B2; EP 1 376 321 A1 (WO 2002/079966). Claim language and Description are taken verbatim from the patent page.
• Title-based only (not verified): JP-A-2005-006144 (Fujitsu/Suda), US 2005/0188408 (Wallis), US 5,605,413 (Motorola), US 7,496,631 (AOL), US 7,257,775 (Microsoft), US 2005/0097600 (Heer), US 2005/0262535 (Uchida), and the family-cited Microsoft/IBM/Sony/TiVo items. Their relevance is asserted from title and metadata only; the actual disclosures must be read before filing or relying on any of this.
• Dates/section status are quoted from the Google Patents page; the § 102(e) availability of granted post-critical-date patents (e.g., US 7,126,587; US 7,595,846) turns on their U.S. filing dates, which I did not verify.
• I do not have the IPR petitions or Board decisions, and all three IPRs (IPR2019-00089, IPR2022-01348, IPR2023-00316) settled — so no institution or final written decision is available to cite. Likewise, the 2024-04-19 reissue filing means claim 1's scope may change; this analysis is against the granted text as published.