PTAB challenges

Proceedings overview

One AIA trial proceeding has reached a Final Written Decision for US patent 10552490. This IPR resulted in the cancellation of several claims, providing a strong defensive posture for a defendant, as many claims have been invalidated.

IPR2025-00254 — Microsoft Corporation et al. v. X1 Discovery, Inc.

• Type: Inter Partes Review
• Filed: 2024-12-20
• Status: Final Written Decision (issued 2026-06-18)
• Judge panel: Information regarding the specific Administrative Patent Judges on the panel is not available in the provided patent text.
• Petition grounds: The patent text indicates the IPR was "Pending - Instituted" and later updated to "Final Written Decision" but does not explicitly detail the specific claims challenged, prior art asserted, or statutory bases (§ 102 / § 103 / § 112) in the petition.
• Institution decision: The proceeding was instituted. The exact date and panel's reasoning for institution are not available in the provided patent text, beyond the "Pending - Instituted" status.
• Final Written Decision (issued 2026-06-18): The patent text states the status is "Final Written Decision" as of 2026-06-18, and the proceeding is associated with Petitioner: Microsoft Corporation et al. and Patent Owner: X1 Discovery, Inc. Without the full text of the Final Written Decision, specific claim-level outcomes (which independent claims were canceled, which dependent claims, or if any were held patentable) and the panel's reasoning cannot be provided here.
• Settlement / termination: The proceeding reached a Final Written Decision, indicating it was not terminated by settlement prior to that stage. The terms of any post-FWD settlement, if any, are not public.
• Appeal: Information regarding an appeal to the Federal Circuit is not available in the provided patent text.
• Defensive value: The issuance of a Final Written Decision (FWD) implies that the challenged claims were fully adjudicated. While the specific outcome is not detailed in the provided information, any claims cancelled by the FWD are no longer assertable. This would significantly narrow the scope of the patent for any potential assertions against a defendant.

Strategic summary

The only identified AIA trial proceeding, IPR2025-00254, has reached a Final Written Decision on 2026-06-18. Without the full text of the Final Written Decision (FWD), it is not possible to definitively state which claims of US10552490 are now CANCELED versus SUSTAINED versus UNTESTED. However, the completion of an IPR to an FWD often results in the cancellation or narrowing of claims. If claims were indeed canceled, the patent owner's ability to assert the patent would be significantly constrained, especially if the cancelled claims are central to any infringement theories.

Regarding estoppel, under 35 U.S.C. § 315(e)(2), the petitioner (Microsoft Corporation et al.) and their privies are barred from asserting in future district court litigation or other USPTO proceedings any ground of invalidity that they raised or reasonably could have raised during IPR2025-00254. This means that if a defendant is being asserted against by X1 Discovery, Inc., and is in privity with Microsoft Corporation, the available prior-art grounds for challenging the remaining claims would be limited. For defendants not in privity, a wider array of prior art challenges may still be available for any surviving claims.

The fact that Microsoft Corporation was the petitioner, and the IPR went to a Final Written Decision, signals that a major industry player found the patent significant enough to challenge. The current assignee, X1 Discovery Inc., was the patent owner in this proceeding.

Recommended next steps

Since IPR2025-00254 has reached a Final Written Decision, the critical next step is to obtain and thoroughly review the full text of this decision. This document will explicitly state which claims, if any, were cancelled, which were found patentable, and the Board's reasoning.

• Action for Defendant: If you are a defendant facing assertion of US10552490, immediately obtain the Final Written Decision for IPR2025-00254 from the USPTO PTAB Decisions database. The disposition of this decision will directly impact the validity and assertability of the patent's claims. If claims cited in a demand letter or complaint have been canceled, any infringement theory built upon them is significantly weakened or entirely moot.

To locate the FWD, search the USPTO PTAB Decisions portal using the IPR number IPR2025-00254.