PTAB challenges

Proceedings overview

A single AIA trial proceeding, IPR2026-00116, has been filed against US Patent 11973864. This proceeding resulted in an institution denial, meaning no claims were ever put to trial or invalidated by the PTAB. Consequently, all claims of the patent remain untested and valid through AIA trial procedures, placing a defendant in a relatively weaker defensive posture compared to a patent that has seen claims canceled.

IPR2026-00116 — [[[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. John A. Nix

• Type: Inter Partes Review
• Filed: 2025-11-07
• Status: Institution Denied
• Judge panel: Not publicly available from the provided data or immediate search results.
• Petition grounds: The specific claims challenged, prior art asserted, and statutory bases (§ 102 / § 103 / § 112) for IPR2026-00116 are not publicly available in the provided data or immediate search results.
• Institution decision: Denied. The institution decision for IPR2026-00116 was issued on April 28, 2026. The reasoning for the denial is not available in the provided data or immediate search results.
• Final Written Decision: Not applicable, as institution was denied.
• Settlement / termination: Not applicable.
• Appeal: Not applicable, as no Final Written Decision was issued.
• Defensive value: The petition for IPR2026-00116 was denied institution. This means that the PTAB did not find a sufficient likelihood that the petitioner would prevail on at least one claim to initiate a trial. This strengthens the patent's standing against similar challenges by the same petitioner on the same grounds, but the specific reasoning for the denial would be crucial to understand its broader implications.

Strategic summary

As of today, May 26, 2026, all claims of US Patent 11973864 remain UNTESTED and SUSTAINED by the PTAB, as the sole Inter Partes Review petition filed against it, IPR2026-00116, was denied institution. No claims have been canceled or narrowed through PTAB proceedings.

The estoppel landscape is minimal due to the institution denial. Generally, a petitioner is barred from asserting invalidity grounds raised or that could have been reasonably raised in an IPR that proceeds to a final written decision. Since IPR2026-00116 did not proceed to trial, the scope of estoppel for the petitioner, Samsung Electronics Co., Ltd. et al., regarding this patent is limited. Other potential defendants, not in privity with Samsung, would likely not be estopped from challenging the patent on any prior-art grounds. The specific reasons for the institution denial would be critical to understand if certain types of prior art or arguments were deemed unpersuasive, which could inform future challenges.

Regarding pattern signals, only one IPR has been filed against US11973864, initiated by Samsung Electronics Co., Ltd. et al. The status of "Institution Denied" indicates that the PTAB did not find sufficient merit in this particular petition to proceed to a full trial. The entry on Google Patents mentions that Unified Patents is associated with the petitioner data for this IPR. This suggests that a defensive aggregator was involved, which often indicates a strategic attempt to invalidate the patent on behalf of its members.

Recommended next steps

For a defendant currently facing assertion of US11973864, it is important to understand the specific reasons for the denial of institution for IPR2026-00116. The full decision can be accessed via the USPTO PTAB E2E system to analyze the Board's reasoning.

Since there are no active PTAB proceedings and no claims have been invalidated, a defendant would need to consider filing their own IPR (or PGR/CBM if applicable) with different prior art and/or arguments if they wish to challenge the patent's validity before the PTAB. The current status means the patent has not been weakened by inter partes review. The fact that the sole IPR was denied institution might signal that the patent owner's claims are relatively robust against the specific arguments and prior art presented in that petition, or that the petition itself was procedurally deficient. Analyzing the denial will be key for any future validity challenge.

• Review the institution denial decision for IPR2026-00116 on the USPTO PTAB E2E portal (e.g., https://e2e.uspto.gov/ptab/). The decision document for IPR2026-00116, issued on 2026-04-28, should provide the specific grounds and reasoning for the denial.