PTAB challenges

Proceedings overview

One Inter Partes Review (IPR) proceeding, IPR2026-00275, is on file against US patent 11715457 and is currently in the pre-institution "Pending" phase. This means the Patent Trial and Appeal Board (PTAB) has not yet decided whether to institute a trial. For a defendant, this creates uncertainty, as the validity of the patent's claims is currently being challenged but no claims have been canceled or confirmed patentable by the PTAB.

IPR2026-00275 — Krisp Technologies, Inc. v. Sanas Ai Inc.

• Type: Inter Partes Review
• Filed: 2026-03-18
• Status: Pending. The petition has been filed, and the PTAB is currently reviewing it to determine whether to institute a trial. The last modification to its status was on 2026-05-26.
• Judge panel: Not yet publicly assigned.
• Petition grounds: Details regarding the specific claims challenged, the prior art references cited, and the statutory bases (§ 102 for novelty and/or § 103 for obviousness) are typically made public upon institution of the trial. As of 2026-05-29, the proceeding is in its pre-institution phase.
• Institution decision: Not yet issued. The statutory deadline for the PTAB to issue an institution decision is six months from the filing date, which is 2026-09-18.
• Final Written Decision: Not applicable, as the proceeding is in the pre-institution phase.
• Settlement / termination: Not applicable, as the proceeding is in the pre-institution phase.
• Appeal: Not applicable, as no Final Written Decision has been issued.
• Defensive value: This pending IPR indicates an active challenge to the validity of US11715457. While no claims have been canceled, the existence of a live IPR means the patent's claims are under scrutiny. The outcome of the institution decision (due by 2026-09-18) will be critical for assessing the patent's strength.

Strategic summary

All claims of US11715457 are currently UNTESTED by a PTAB Final Written Decision, as the single IPR filed against it, IPR2026-00275, is still in its pre-institution "Pending" phase. There are no claims that have been formally CANCELED or SUSTAINED by the PTAB at this time. Sanas Ai Inc. is identified as the current assignee of the patent.

Regarding estoppel, the provisions of 35 U.S.C. § 315(e)(2) would apply to the petitioner, Krisp Technologies, Inc., and parties in privity with them, only if a Final Written Decision is issued. If a Final Written Decision were to be issued, Krisp Technologies, Inc. and its privies would be estopped from asserting in a civil action or another USPTO proceeding that a claim is invalid on any ground that Krisp Technologies, Inc. raised or reasonably could have raised during the IPR. Since the IPR is still pending institution, no estoppel has yet attached. Therefore, for a defendant currently facing assertion of this patent, prior-art grounds remain broadly available until an institution decision, and potentially after if institution is denied or only partially granted.

As for pattern signals, only one IPR has been filed against US11715457 to date, IPR2026-00275. The petitioner is Krisp Technologies, Inc., and the case is still in its initial stages. It is too early to discern any aggressive appeal patterns from the patent owner or a history of multiple challenges from the same petitioner or defensive aggregators based on the current single, pending proceeding.

Recommended next steps

• Monitor IPR2026-00275 closely: The most immediate critical milestone is the institution decision, which is due by 2026-09-18. This decision will indicate which claims (if any) the PTAB believes are likely unpatentable and will proceed to trial. The institution decision, when issued, will be available on the USPTO PTAB E2E system.
• Review the petition: Once the institution decision is made public, if the trial is instituted, the petition and the grounds asserted by Krisp Technologies, Inc. should be thoroughly reviewed to understand the scope of the challenge.
• Assess potential impact: If the PTAB institutes trial on any claims, it significantly weakens the patent owner's position regarding those claims. If institution is denied, it strengthens the patent owner's position for the challenged claims against similar prior art.