PTAB challenges

Proceedings overview

A single AIA trial proceeding, IPR2025-00381, has been filed against US patent 11465891. This Inter Partes Review, initiated by Kubota North America Corporation et al., has reached a Final Written Decision. The outcome of this decision will determine the defensive posture for a defendant.

IPR2025-00381 — Kubota North America Corporation et al. v. Vermeer Manufacturing Company

• Type: Inter Partes Review
• Filed: 2025-01-07
• Status: Final Written Decision (last modified 2026-06-30). This means the PTAB has issued its final determination on the patentability of the challenged claims.
• Judge panel:
  • Administrative Patent Judge John P. Davidson
  • Administrative Patent Judge Jo-Anne M. Coe
  • Administrative Patent Judge Robert H. Baek
• Petition grounds: The petition challenged claims 1-10 of U.S. Patent No. 11,465,891 as unpatentable under 35 U.S.C. § 103(a) over various combinations of prior art. Specifically, the petition alleged that claims 1–10 were unpatentable as obvious over U.S. Patent No. 9,970,176 to Hillebrand et al. ("Hillebrand"), in view of U.S. Patent No. 7,980,569 to Lunder et al. ("Lunder").
• Institution decision: Instituted on July 7, 2025. The PTAB determined that the Petitioner demonstrated a reasonable likelihood that claims 1-10 of U.S. Patent No. 11,465,891 are unpatentable as obvious over Hillebrand in view of Lunder.
• Final Written Decision (issued 2026-06-30):
  • Claims 1-10 were found unpatentable.
  • The PTAB concluded that Petitioner demonstrated by a preponderance of the evidence that claims 1–10 are unpatentable as obvious over Hillebrand in view of Lunder.
  • Specifically, the panel stated: "For the reasons discussed above, we determine that Petitioner has shown by a preponderance of the evidence that claims 1–10 are unpatentable. We therefore cancel claims 1–10 of the ’891 patent."
• Settlement / termination: Not applicable; a Final Written Decision was issued.
• Appeal: No information found regarding an appeal to the Federal Circuit as of 2026-07-01.
• Defensive value: All ten claims of US11465891 (claims 1-10) have been found unpatentable and are thus canceled. Any infringement theory built on these claims is fundamentally undermined, effectively eliminating the patent for assertion against parties that could raise the same or substantially similar prior art.

Strategic summary

All ten claims (claims 1-10) of US patent 11465891 have been CANCELED by the Patent Trial and Appeal Board in IPR2025-00381. There are no claims of this patent that have been sustained or remain untested through this IPR. The patent has been entirely invalidated based on obviousness grounds over the combination of Hillebrand and Lunder.

The estoppel landscape under § 315(e)(2) will bar Kubota North America Corporation and Kubota Tractor Corporation (and their privies) from asserting in future litigation that claims 1-10 are valid on any ground that was raised or reasonably could have been raised in IPR2025-00381. For other potential defendants, this means the specific prior art combination of Hillebrand in view of Lunder, which proved successful in invalidating all claims, is a robust and available defense. Other prior-art grounds not considered in this IPR would also remain available to different defendants, but given the complete cancellation, further IPRs might be redundant unless new claims are introduced through reissue or reexamination.

The fact that the Final Written Decision was issued indicates that the proceeding ran its full course. The petitioner, Kubota, successfully challenged all claims. The listed litigation in the Texas Northern District Court (4:24-cv-00799) involving this patent would now be significantly impacted, as the asserted claims are likely invalid.

Recommended next steps

As a defendant facing assertion of US patent 11465891, the primary recommended next step is to immediately leverage the Final Written Decision from IPR2025-00381. All ten claims of the patent have been canceled.

• Disposition of FWD: The Final Written Decision for IPR2025-00381 explicitly states: "For the reasons discussed above, we determine that Petitioner has shown by a preponderance of the evidence that claims 1–10 are unpatentable. We therefore cancel claims 1–10 of the ’891 patent."
• Action: File a motion to dismiss or for summary judgment of non-infringement/invalidity in any ongoing district court litigation (e.g., 4:24-cv-00799 in the Texas Northern District Court), citing the PTAB's cancellation of all claims.
• Monitor Appeals: Continuously monitor the Federal Circuit docket for any appeal filed by Vermeer Manufacturing Company challenging the PTAB's Final Written Decision in IPR2025-00381. As of today, no such appeal information was found.

Given that all claims have been canceled, the patent is effectively dead for future assertion unless the PTAB's decision is reversed on appeal.