PTAB challenges

Proceedings overview

One AIA trial proceeding is currently on file for US Patent 11277650. The proceeding is an Inter Partes Review (IPR) with a status of "Trial Instituted," meaning the PTAB has found sufficient merit for a full review of the challenged claims. This indicates a live challenge to the patent's validity, making the defensive posture for a defendant uncertain until a Final Written Decision is issued.

IPR2025-01308 — [[Samsung Electronics Co.](/litigations/by-defendant/Samsung%20Electronics%20Co.) Ltd.](/litigations/by-plaintiff/Samsung%20Electronics%20Co.%20Ltd.) et al. v. Maxell Ltd

• Type: Inter Partes Review
• Filed: 2025-07-17
• Status: Trial Instituted. The PTAB has determined that the petitioner has shown a reasonable likelihood that at least one challenged claim is unpatentable, thus initiating the trial phase of the IPR.
• Judge panel: The institution decision, issued on April 9, 2026, lists Administrative Patent Judges Jo-Ann M. Wallace, Jeffrey F. Goucher, and Brian J. Leitten as the panel.
• Petition grounds: The petition challenged claims 1-20 of US Patent 11,277,650 B2. The grounds for unpatentability were based on obviousness under 35 U.S.C. § 103, citing various combinations of prior art references including US 2005/0144633 A1 (Kamimaki), US 2005/0198679 A1 (Ishizuka), US 2004/0049787 A1 (Sato), JP 2005-198061 A (Hitachi), and JP 2002-169747 A (Matsushita Electric Industrial Co., Ltd.).
• Institution decision: Instituted on 2026-04-09. The Board instituted trial on all challenged claims (1-20) for obviousness over various combinations of prior art. For example, claims 1-20 were instituted on the grounds of obviousness over Kamimaki in view of Ishizuka. The Board found that the petition demonstrated a reasonable likelihood of showing that the challenged claims are unpatentable.
• Final Written Decision (if issued): Not yet issued. The trial was instituted on April 9, 2026, and a final written decision is typically due within one year of institution.
• Settlement / termination: Not applicable; the proceeding is active.
• Appeal: Not applicable; no Final Written Decision has been issued to appeal.
• Defensive value: This active IPR challenges all claims of the patent (1-20). If these claims are ultimately invalidated, it would significantly weaken the patent's enforceability. Defendants should monitor this proceeding closely, as a successful outcome for the petitioner could provide strong grounds for non-infringement or invalidity arguments.

Strategic summary

All claims (1-20) of US Patent 11277650 are currently undergoing an Inter Partes Review (IPR2025-01308). The PTAB has instituted trial on all these claims, finding a reasonable likelihood that they are unpatentable based on obviousness over prior art references such as Kamimaki, Ishizuka, Sato, JP '061, and JP '747. Consequently, at this stage, no claims have been canceled or definitively sustained; all are presently under review for validity.

The estoppel landscape will become relevant upon the issuance of a Final Written Decision. If the IPR proceeds to a Final Written Decision, 35 U.S.C. § 315(e)(2) will bar the petitioner (Samsung Electronics Co. Ltd. et al.) and its privies from asserting in other venues that claims held patentable are invalid on any ground that the petitioner raised or reasonably could have raised during the IPR. For other potential defendants, the prior art grounds raised in this IPR (Kamimaki, Ishizuka, Sato, JP '061, and JP '747, and their combinations) remain available for separate invalidity challenges, assuming no privity with the current petitioner. The fact that Samsung, a major electronics company, is the petitioner suggests a significant interest in challenging the patent and indicates a pattern of large entities using IPRs defensively against asserted patents.

Recommended next steps

Since IPR2025-01308 has been instituted, a Final Written Decision is expected within one year of the institution date. Given the institution date of April 9, 2026, the Final Written Decision is anticipated by April 9, 2027. Defendants currently facing assertion of US Patent 11277650 should closely monitor the progress of IPR2025-01308. A favorable outcome for the petitioner, resulting in claim invalidation, could be directly leveraged in defense. Access the full institution decision for IPR2025-01308 via the USPTO PTAB End-to-End system by searching for the proceeding number.