PTAB challenges

Proceedings overview

There are two AIA trial proceedings on file for US Patent 10321320. One proceeding (IPR2026-00153) resulted in a discretionary denial of institution, meaning the patent claims were not reviewed on the merits and remain intact. The other proceeding (IPR2026-00106) has been instituted for trial and is currently pending, with the claims under active review. This posture indicates that the patent has largely withstood one challenge on procedural grounds but is currently facing a substantive challenge in another. For a defendant, this means that the patent claims are currently presumed valid as no claims have been invalidated by the PTAB yet; however, the ongoing IPR could alter this.

IPR2026-00153 — Target Corporation v. Headwater Research LLC

• Type: Inter Partes Review
• Filed: 2025-11-25
• Status: Discretionary Denial. The petition was denied institution by the PTAB, preventing a full review of the challenged claims on the merits.
• Judge panel: Information not publicly available through search results.
• Petition grounds: Specific claims and prior art challenged were not identified in the available search results.
• Institution decision: Denied. The institution decision, issued around April 23, 2026 (based on the "last modified" date), was a discretionary denial. The PTAB likely applied factors similar to the Fintiv framework, considering the advanced stage of parallel district court litigation involving the patent. The Board typically assesses factors such as the proximity of a district court trial date to a potential Final Written Decision, overlap of parties and issues, and the strength of the petition's merits when deciding on discretionary denial. Given the filing date of this IPR (November 25, 2025), the institution decision would have been made under the USPTO Director's new policy, effective October 20, 2025, where the Director personally decides whether to institute IPR petitions in consultation with PTAB judges.
• Final Written Decision: Not applicable, as institution was denied.
• Settlement / termination: Not applicable, as institution was denied.
• Appeal: Not applicable, as institution was denied.
• Defensive value: This proceeding indicates that the PTAB, for this specific IPR, chose not to review the patent claims on the merits, likely due to a parallel district court case reaching trial before the PTAB's statutory deadline for a Final Written Decision. This outcome means no claims were invalidated, and any infringement theories based on US10321320 remain unaffected by this particular IPR. However, it also highlights that the patent owner faced a challenge, which was averted on procedural rather than substantive grounds.

IPR2026-00106 — Amazon.com Services LLC et al. v. Headwater Research LLC

• Type: Inter Partes Review
• Filed: 2025-11-10
• Status: Trial Instituted. The PTAB has determined that there is a reasonable likelihood that at least one challenged claim is unpatentable, and a trial is actively underway.
• Judge panel: Information not publicly available through search results.
• Petition grounds: Specific claims and prior art challenged were not identified in the available search results.
• Institution decision: Instituted. The institution decision was issued on or before May 13, 2026 (based on the "last modified" date), indicating the PTAB found sufficient grounds to proceed with a full review of the challenged claims. This decision would also have fallen under the USPTO Director's new institution policy.
• Final Written Decision: Not yet issued, as the trial is pending.
• Settlement / termination: Not yet applicable, as the trial is pending.
• Appeal: Not yet applicable, as no Final Written Decision has been issued.
• Defensive value: This proceeding represents an active challenge to the patent's validity. If a defendant is facing assertions based on US10321320, the outcome of this IPR could significantly impact the strength of those assertions. Should claims be invalidated in the Final Written Decision, any infringement theories relying on those claims would be weakened or eliminated. Conversely, if claims are affirmed, it would strengthen the patent owner's position.

Strategic summary

Currently, no claims of US10321320 have been formally canceled by the PTAB. All original claims are SUSTAINED or UNTESTED on their merits by the PTAB. One IPR (IPR2026-00153) was denied institution on discretionary grounds, meaning the validity of the claims was not assessed. Another IPR (IPR2026-00106) has been instituted for trial, meaning the claims challenged in that petition are currently under review for patentability.

Regarding the estoppel landscape, for IPR2026-00153, the petitioner, Target Corporation (and its privies), would generally be estopped under 35 U.S.C. § 315(e)(1) from asserting in a civil action or ITC proceeding that a claim is invalid on any ground that it raised or reasonably could have raised in the IPR, if a Final Written Decision had been issued. However, since institution was denied, the full scope of estoppel for a denial on Fintiv grounds can be complex and may not bar all grounds that could have been raised in district court. For IPR2026-00106, should a Final Written Decision issue, Amazon.com Services LLC (and its privies) would face estoppel on any claims found unpatentable and any grounds raised or reasonably could have raised against claims found patentable. This means that a defendant not privy to Amazon could potentially bring similar prior-art grounds if Amazon's petition did not cover all possible art, or if the PTAB's decision was limited in scope.

The pattern signals indicate that Headwater Research LLC is actively defending its patent, with at least one IPR being denied institution. The fact that IPR2026-00106 was instituted, despite the Director's increased scrutiny on institution decisions (with early FY2026 data showing a 51% institution-denial rate), suggests that Amazon's petition presented particularly strong arguments for unpatentability, or the specific Fintiv factors (such as the proximity of district court trial dates) did not weigh as heavily against institution as they did in the Target IPR. The presence of litigation in multiple district courts and worldwide family litigation, as noted in the patent summary, further signals that this patent is being actively asserted.

Recommended next steps

For a defendant currently facing assertion of US Patent 10321320, the most critical next step is to closely monitor IPR2026-00106, as it is currently in the trial phase. The Final Written Decision for this IPR is expected within approximately one year of the institution date (which was on or before 2026-05-13), so around May 2027. This decision will be highly impactful as it will determine the patentability of the challenged claims. Obtaining the institution decision for IPR2026-00106 and reviewing the claims and prior art on which the trial was instituted is crucial to understand the immediate risks and opportunities.

Additionally, while IPR2026-00153 was denied institution, its denial was likely based on procedural Fintiv factors rather than a full review of the merits. A defendant should review the specific order for denial to understand the exact reasoning and whether any of the prior art raised in that petition could still be viable in district court or a new IPR by a different party (subject to evolving PTAB policies and estoppel considerations).

Given the recent shifts in PTAB policy, particularly regarding discretionary denials based on parallel district court litigation and the Director's increased involvement in institution decisions, any potential future PTAB challenges would need to carefully navigate these evolving rules.