PTAB challenges

Proceedings overview

There is currently one AIA trial proceeding on file for US patent 11581322. This proceeding, IPR2025-00191, has reached a Final Written Decision, but the specific outcomes regarding claims invalidated or sustained are not yet publicly detailed in this overview. The defensive posture for a defendant will depend entirely on the specific claims found unpatentable in the Final Written Decision.

IPR2025-00191 — Micron Technology, Inc. et al. v. Yangtze Memory Technologies Company, Ltd.

• Type: Inter Partes Review
• Filed: 2024-12-02
• Status: Final Written Decision – A final decision on patentability of the challenged claims has been issued by the PTAB.
• Judge panel: Not publicly available in the provided data or immediate search results.
• Petition grounds: Details regarding specific claims challenged, prior art references, and statutory bases (§ 102 / § 103 / § 112) are not explicitly stated in the provided information or immediate search results. To obtain these details, the full petition and institution decision would need to be reviewed.
• Institution decision: The proceeding reached a Final Written Decision, indicating that institution was granted. The specific date and panel's reasoning for institution are not immediately available.
• Final Written Decision (if issued): The Final Written Decision was last modified on 2026-07-06. The specific verdict at a claim-level granularity (which independent/dependent claims were canceled or held patentable) is not yet available through the provided data. To determine the outcome, the full FWD document would need to be accessed.
• Settlement / termination: No information regarding settlement or termination is available.
• Appeal: No information regarding an appeal to the Federal Circuit is available as of 2026-07-07.
• Defensive value: Without the specific claim-level outcome of the Final Written Decision, the defensive value of this IPR is currently unknown. If claims asserted against a defendant have been invalidated, it could significantly weaken an assertion. Conversely, if claims were sustained, it would harden the patent against IPR-based defenses.

Strategic summary

As of 2026-07-07, only one IPR proceeding, IPR2025-00191, has concluded with a Final Written Decision for US patent 11581322. The crucial details regarding which claims were canceled versus sustained are not yet available from the provided data. Therefore, a complete picture of the narrowed scope of the patent or the surviving claims cannot be drawn at this time.

The estoppel landscape under § 315(e)(2) for this patent is dependent on the specific grounds and claims addressed in IPR2025-00191's Final Written Decision. Once the FWD is public, the petitioner (Micron Technology, Inc. et al.) and their privies would be estopped from challenging claims found patentable, or any claim on any ground that was raised or reasonably could have been raised in the IPR. Without knowing the scope of the FWD, it's impossible to determine which prior-art grounds are still available for other potential defendants. There are no immediate pattern signals to discern, as only one proceeding is listed.

Recommended next steps

For a defendant facing assertion of US11581322, the immediate priority is to obtain and thoroughly review the Final Written Decision for IPR2025-00191. The FWD was last modified on 2026-07-06, indicating it should be publicly accessible soon, if not already, through the USPTO PTAB Decisions portal. Accessing this document is critical to understand which claims, if any, have been canceled.
Once the FWD is available, review it to determine:

1. Which specific claims, if any, were found unpatentable. If the asserted claims are among those canceled, this provides a strong defense. Quote the disposition directly from the FWD in your legal arguments.
2. The Board's reasoning for both patentable and unpatentable claims.
3. The prior art references considered by the Board.

You can search for the Final Written Decision on the USPTO PTAB E2E system using the proceeding number IPR2025-00191: https://developer.uspto.gov/ptab-e2e.
Additionally, monitor the Federal Circuit's docket for any potential appeal of this FWD, which would be filed by either party.