PTAB challenges

Proceedings overview

There is one AIA trial proceeding on file for US Patent 11971937, which is currently pending. This means the patent's claims are actively being challenged, and the outcome of this proceeding will determine their validity.

IPR2026-00289 — Google LLC v. Accusearch Technologies LLC

• Type: Inter Partes Review
• Filed: 2026-03-13
• Status: Pending. The petition has been filed and is awaiting an institution decision from the PTAB. The last modified date was 2026-05-18.
• Judge panel: The judge panel has not yet been publicly assigned or is not readily available for a pending petition prior to institution.
• Petition grounds: The petition was filed by Google LLC challenging claims of US Patent 11971937. Specific claims challenged, prior art references, and statutory bases (§ 102 / § 103) are typically detailed in the petition, which is not publicly available in a summarized format at this early stage.
• Institution decision: Not yet issued. The statutory deadline for the PTAB to decide whether to institute an IPR is typically one year from the date the petition is filed, though often an institution decision is made within six months of the petition filing date. Given the filing date of March 13, 2026, an institution decision would be expected around September 13, 2026.
• Final Written Decision: Not applicable, as the proceeding is pending institution.
• Settlement / termination: Not applicable, as the proceeding is pending institution.
• Appeal: Not applicable, as the proceeding is pending institution.
• Defensive value: This proceeding indicates that Google LLC is actively challenging the patent. For a defendant, this means there is an ongoing effort to invalidate claims of the patent, which could potentially reduce litigation risk if the IPR is instituted and leads to claim cancellation. However, until an institution decision is made, the patent's claims remain presumptively valid.

Strategic summary

US Patent 11971937 is currently the subject of one active Inter Partes Review, IPR2026-00289, filed by Google LLC. All claims of the patent are considered untested at the PTAB, as the proceeding is still in the pre-institution phase. There are no canceled or sustained claims as a result of PTAB review to date.

The estoppel landscape is not yet relevant as no final written decision has been issued. If the IPR is instituted, and a final written decision is issued, Google LLC (and its privies) would be estopped from asserting invalidity grounds that were raised or reasonably could have been raised in the IPR concerning the claims that proceeded to a final decision. For other defendants, prior-art grounds remain available. The involvement of Google LLC as a petitioner signals a significant challenge to the patent.

Recommended next steps

For a defendant facing assertion of US Patent 11971937, it is critical to monitor IPR2026-00289 closely. The key upcoming milestone is the institution decision, expected around September 13, 2026. A decision to institute would indicate the PTAB believes there is a reasonable likelihood that at least one challenged claim is unpatentable, increasing the risk for the patent owner. If institution is granted, the trial will proceed, with a Final Written Decision due approximately one year from the institution date.
You can monitor the progress of IPR2026-00289 via the USPTO PTAB E2E system by searching for the proceeding number IPR2026-00289.## Proceedings overview
There is one AIA trial proceeding on file for US Patent 11971937, which is currently pending. This means the patent's claims are actively being challenged. As the proceeding is in its early stages, there have been no claim-level outcomes yet. The bottom-line defensive posture for a defendant is that the patent is under active review for validity at the PTAB, presenting a potential opportunity for claim invalidation.

IPR2026-00289 — Google LLC v. Accusearch Technologies LLC

• Type: Inter Partes Review
• Filed: 2026-03-13
• Status: Pending. The petition has been filed, and the PTAB is currently reviewing it to determine whether to institute a trial. The last modified date was 2026-05-18.
• Judge panel: A judge panel has not yet been publicly assigned or is not typically announced prior to the institution decision. Since October 20, 2025, the USPTO Director decides whether to institute IPRs, in consultation with at least three PTAB judges, rather than a merits panel of APJs.
• Petition grounds: Details regarding the specific claims challenged, the prior art asserted, and the statutory bases (e.g., obviousness under 35 U.S.C. § 103 or anticipation under 35 U.S.C. § 102) are contained within the petition itself. This information is not publicly available in a summarized format at this pre-institution stage.
• Institution decision: Not yet issued. The statutory deadline for the USPTO Director to issue an institution decision is typically one year from the date the petition is filed. Given the filing date of March 13, 2026, an institution decision for IPR2026-00289 is anticipated around March 13, 2027. However, decisions are often made within six months, so it could be as early as September 13, 2026. The Director's decision will consider discretionary factors, including new guidance issued on March 11, 2026, which directs the PTAB to weigh U.S. manufacturing activity when deciding whether to institute an AIA trial.
• Final Written Decision: Not applicable, as the proceeding is pending institution.
• Settlement / termination: Not applicable, as the proceeding is pending institution.
• Appeal: Not applicable, as the proceeding is pending institution.
• Defensive value: This active IPR indicates that the patent's validity is being challenged by a significant entity (Google LLC). While the claims remain presumptively valid until a decision on institution, an instituted IPR could lead to claims being canceled, thereby reducing the scope of the patent and diminishing its assertion value. For a defendant, this creates a possibility of claims being invalidated without their direct involvement, potentially alleviating some litigation pressure.

Strategic summary

US Patent 11971937 is currently the subject of one active Inter Partes Review, IPR2026-00289, initiated by Google LLC. As of May 29, 2026, this proceeding is in the pre-institution phase, meaning no claims have yet been formally challenged, canceled, or sustained by the PTAB. Consequently, all claims of US11971937 are currently untested in the context of this IPR.

The estoppel landscape is not yet established. Should the PTAB institute the IPR and issue a final written decision, Google LLC (and any privies) would be estopped under 35 U.S.C. § 315(e)(2) from asserting invalidity grounds that were raised or reasonably could have been raised against claims addressed in the final decision. For other potential defendants, all prior-art grounds remain available for challenge. The involvement of Google LLC, a major technology company, as a petitioner suggests a serious challenge to the patent's validity. Recent policy shifts at the USPTO, including the Director's personal review of institution decisions (effective October 2025) and new discretionary factors related to U.S. manufacturing (effective March 2026), could influence the institution decision for this IPR. Petitioners must also be mindful of consistently maintaining claim construction positions between district court and the PTAB.

Recommended next steps

For a defendant facing assertion of US Patent 11971937, it is paramount to closely monitor IPR2026-00289. The most significant upcoming milestone is the institution decision, which is statutorily due around March 13, 2027, but could be issued around September 13, 2026. A decision to institute would signal that the PTAB believes there is a reasonable likelihood that at least one challenged claim is unpatentable, significantly altering the risk profile for the patent owner. The PTAB's Open Data Portal can be used to track the progress of IPR2026-00289.