PTAB challenges

Proceedings overview

One AIA trial proceeding is on file for US Patent 9647918, currently in a pending status. This means the patent has not yet been substantively challenged and there are no claims invalidated or sustained by a Final Written Decision. The defensive posture for a defendant facing assertion of this patent is that the claims remain untested by an AIA trial.

IPR2026-00137 — Google LLC et al. v. Headwater Research LLC

• Type: Inter Partes Review
• Filed: 2026-01-15
• Status: Pending. According to Google Patents, this case is still pending as of May 28, 2026.
• Judge panel: Information regarding the specific judge panel for IPR2026-00137 is not publicly available at this early stage of the proceeding.
• Petition grounds: Details of the specific claims challenged, prior art, and statutory bases (§ 102 / § 103 / § 112) of the petition are not yet widely available in public summaries for this pending case.
• Institution decision: As of the current date, no institution decision has been issued for IPR2026-00137. The PTAB has a statutory deadline for issuing institution decisions.
• Final Written Decision: No Final Written Decision has been issued for this proceeding as it is still pending.
• Settlement / termination: There is no public record of settlement or termination for this pending proceeding.
• Appeal: No appeal has been filed as no Final Written Decision has been issued.
• Defensive value: This proceeding is in its early stages. If institution is granted, it could lead to claim cancellation, but currently, all claims of US9647918 remain unchallenged by a PTAB Final Written Decision.

Strategic summary

As of May 28, 2026, IPR2026-00137 is the only AIA trial proceeding on file for US patent 9647918. This proceeding is currently in the "Pending" stage, meaning the PTAB has not yet decided whether to institute a trial. Consequently, all claims of US9647918 are currently untested by an AIA trial, and none have been canceled or sustained by a PTAB Final Written Decision.

The estoppel landscape remains open for potential future petitioners. Since no institution decision has been rendered, there is no estoppel under 35 U.S.C. § 315(e)(2) for Google LLC (the petitioner) or their privies concerning any grounds that were or reasonably could have been raised. For any other defendant, all prior-art grounds remain available for challenge against US9647918 in a new IPR, assuming statutory requirements are met. There are no clear patterns signals regarding multiple IPRs by the same petitioner or aggressive appeals by the patent owner yet, as this is the only identified proceeding and it is still pending.

Recommended next steps

For a defendant currently being asserted against, it is important to monitor the status of IPR2026-00137 closely. The primary upcoming milestone will be the institution decision, which typically occurs approximately six months after the petition filing date. Given the filing date of 2026-01-15, an institution decision would be expected around July 2026. If the PTAB institutes the trial, the patent owner will then have an opportunity to respond, followed by discovery and an oral hearing, with a Final Written Decision due within one year of institution.

A comprehensive prior art search and analysis of US9647918 would be prudent to identify potential invalidity grounds. If the asserted claims are strong and the patent owner has a history of successful defense, initiating a new IPR might be challenging. However, the absence of any prior successful IPR challenges means there's no "hardened" claims from previous PTAB review to contend with.