PTAB challenges

Proceedings overview

There is one active AIA trial proceeding associated with US patent 11664926, which is currently in the trial instituted phase. This means the patent's claims are actively being challenged, and no final decision on their validity has been issued yet. The defensive posture for a defendant is that some claims are under active review at the PTAB, but have not been invalidated.

IPR2025-01165 — [[[Samsung Electronics Co.](/litigations/by-defendant/Samsung%20Electronics%20Co.), Ltd.](/litigations/by-plaintiff/Samsung%20Electronics%20Co.%2C%20Ltd.) et al.](/litigations/by-plaintiff/Samsung%20Electronics%20Co.%2C%20Ltd.%20et%20al.) v. Wilus Institute of Standards and Technology Inc.

• Type: Inter Partes Review
• Filed: 2025-06-24
• Status: Trial Instituted (The PTAB has decided to initiate a review of the challenged claims).
• Judge panel: Information regarding the specific Administrative Patent Judges on the panel is not readily available through general public search at this stage.
• Petition grounds: Specific details on which claims were challenged, the prior art asserted, and the statutory bases (§ 102 for anticipation, § 103 for obviousness) require access to the petition or institution decision document, which is not publicly available in detail through general search. However, based on the patent's nature (wireless communication, A-MPDU), the challenges would likely involve prior art related to aggregation methods and response frames in wireless LAN systems.
• Institution decision: The trial was instituted. The exact date of institution is not explicitly stated in the provided context, but given the filing date of 2025-06-24 and typical PTAB timelines, the institution decision would have occurred approximately six months after filing, around December 2025 or January 2026. The reasoning for institution would typically involve the PTAB panel determining that the petitioner demonstrated a reasonable likelihood that at least one of the challenged claims is unpatentable.
• Final Written Decision: Not yet issued. The PTAB has a statutory deadline of one year from institution to issue a Final Written Decision. Given an approximate institution date of late 2025/early 2026, the FWD would be expected around late 2026 or early 2027.
• Settlement / termination: No public information indicates a settlement or termination.
• Appeal: Not applicable, as a Final Written Decision has not been issued.
• Defensive value: This proceeding indicates that some claims of US11664926 are currently facing a patentability challenge at the PTAB. While the trial is ongoing, no claims have been invalidated. A defendant should monitor this IPR closely, as an unfavorable outcome for the patent owner could significantly weaken the patent's enforceability. Conversely, if the patent owner prevails, the claims will be strengthened against similar prior art challenges.

Strategic summary

As of the current date, no claims of US11664926 have been canceled or sustained by a Final Written Decision at the PTAB. The patent is actively undergoing one Inter Partes Review, IPR2025-01165, where certain claims are being challenged. All claims are currently considered untested in terms of a final PTAB ruling.

The estoppel landscape has not yet fully formed for this patent. Once a Final Written Decision is issued in IPR2025-01165, Samsung Electronics Co., Ltd. and its privies will be estopped from asserting invalidity grounds they raised or reasonably could have raised during the IPR against the claims that survive. Other potential defendants not in privy with Samsung would not be subject to this estoppel for IPR2025-01165 and could still challenge the patent on grounds raised or unraised by Samsung.

Regarding pattern signals, the current assignee is Wilus Institute of Standards and Technology Inc., which indicates a likely licensing or assertion entity. Samsung Electronics Co., Ltd. is a large operating company, and their decision to file an IPR suggests they are likely a defendant or potential defendant in litigation involving this patent. While Unified Patents is mentioned as a data source on the Google Patents page, the canonical list provided for IPR2025-01165 explicitly names Samsung as the petitioner.

Recommended next steps

The IPR2025-01165 proceeding is active and in the trial stage. Key upcoming milestones include:

• Oral Hearing: Typically held a few months before the Final Written Decision.
• Final Written Decision (FWD) Due Date: One year from the institution date (approximately late 2026/early 2027). The PTAB often issues FWDs close to this deadline.

A defendant facing assertion of this patent should closely monitor IPR2025-01165 via the USPTO PTAB E2E portal. The institution decision, when publicly available, would provide critical insight into the PTAB's initial assessment of the patentability of the challenged claims. The eventual Final Written Decision will definitively determine the patentability of the challenged claims, which will be highly influential in any ongoing or future litigation involving US11664926.