PTAB challenges

Proceedings overview

There is one AIA trial proceeding on file for US patent 10529029. The proceeding, IPR2025-01358, resulted in a discretionary denial of institution, meaning no claims were invalidated. This gives a defendant a posture where the patent has survived one IPR petition and is therefore strengthened against subsequent, similar challenges.

IPR2025-01358 — Zesty.ai, Inc. v. Aon Benfield Inc.

• Type: Inter Partes Review
• Filed: 2025-07-30
• Status: Discretionary Denial. The Patent Trial and Appeal Board (PTAB) declined to institute the inter partes review.
• Judge panel: The judge panel consisted of Administrative Patent Judges J. Kim, J. Siu, and S. Kim.
• Petition grounds: Zesty.ai, Inc. challenged claims 1-20 of U.S. Patent No. 10,529,029 as unpatentable under 35 U.S.C. § 103 over various combinations of prior art, including U.S. Patent No. 8,639,598 (Reid), U.S. Patent No. 7,496,220 (Coyle), U.S. Patent No. 8,571,327 (Liu), and U.S. Patent No. 9,454,772 (Patel).
• Institution decision: Denied on 2025-12-23. The Board exercised its discretion to deny institution under 35 U.S.C. § 314(a), considering factors from Fintiv and related cases. Specifically, the Board found that a parallel district court litigation was in an advanced stage, with a trial date set shortly after the FWD deadline, and that the petitioner had unduly delayed filing the IPR petition.
• Final Written Decision: Not applicable, as the petition was denied institution.
• Settlement / termination: The proceeding was terminated due to the discretionary denial of institution.
• Appeal: No appeal was filed, as there was no Final Written Decision to appeal.
• Defensive value: Patent owner prevailed at institution; an IPR-based defense on the asserted grounds would be significantly harder for Zesty.ai, Inc. or its privies due to estoppel. For others, the discretionary denial highlights the PTAB's consideration of parallel litigation and timing.

Strategic summary

All claims (1-20) of US10529029 remain patentable and untested at the PTAB following the discretionary denial of IPR2025-01358. The patent owner successfully argued against institution, meaning there has been no claim-level invalidation in this proceeding.

Regarding the estoppel landscape, Zesty.ai, Inc. and its privies are estopped under 35 U.S.C. § 315(e)(2) from asserting in other venues (including district court) that claims 1-20 are unpatentable on any ground that they raised or reasonably could have raised in IPR2025-01358. For other potential defendants, the prior art presented in the IPR petition (Reid, Coyle, Liu, Patel, and their combinations) remains available for use in other challenges, although the PTAB's reasoning for discretionary denial in this case (parallel litigation, timing) would need to be carefully considered for any new IPR filing.

The proceeding signals that the patent owner, Aon Benfield Inc., is actively defending its patent against challenges, successfully preventing the institution of an IPR based on procedural grounds related to co-pending litigation. The petitioner, Zesty.ai, Inc., is an AI-powered property intelligence company, suggesting potential competitive interest in the patent's subject matter.

Recommended next steps

Given the discretionary denial of institution for IPR2025-01358, the claims of US10529029 remain patentable as far as this PTAB proceeding is concerned. Any party considering a future PTAB challenge against this patent should carefully review the PTAB's institution decision for IPR2025-01358, particularly the reasoning related to the Fintiv factors and timing of the petition relative to parallel litigation, to inform their strategy.

The decision can be found on the USPTO PTAB Decisions portal:

• Zesty.ai, Inc. v. Aon Benfield Inc., IPR2025-01358, Paper 10 (Decision Denying Institution), entered 2025-12-23.