PTAB challenges

Proceedings overview

One AIA trial proceeding has been filed against US patent 9542571, which was terminated-settled. This outcome means that no claims of the patent were invalidated or sustained by a Patent Trial and Appeal Board (PTAB) final written decision, leaving all claims legally untested by PTAB review. From a defensive posture, the patent has not been narrowed by PTAB action, but the existence and settlement of the IPR indicate that at least one party identified potential invalidity grounds.

IPR2026-00007 — Nintendo Co., Ltd. et al. v. Malikie Innovations Ltd

• Type: Inter Partes Review
• Filed: 2025-10-09
• Status: Terminated-Settled. The proceeding concluded due to a settlement between the parties before a substantive decision on the merits of the patentability challenge.
• Judge panel: The specific judge panel for IPR2026-00007 is not publicly available from the provided information or search results.
• Petition grounds: The specific claims challenged and prior art grounds (§ 102 / § 103 / § 112) for this IPR are not publicly available from the provided information or search results.
• Institution decision: This IPR was terminated-settled on 2026-03-02. As the institution decision deadline (typically six months from the petition filing date) would have been around 2026-04-09, it is highly probable that the settlement occurred before the PTAB issued a decision on whether to institute the inter partes review. Therefore, no institution decision was issued.
• Final Written Decision: No Final Written Decision was issued due to the settlement and termination of the proceeding.
• Settlement / termination: The proceeding was terminated as settled on 2026-03-02. The terms of such settlements are typically confidential and not publicly disclosed.
• Appeal: Not applicable, as no Final Written Decision was issued.
• Defensive value: This IPR did not result in any claims being cancelled by the PTAB. While the patent remains formally intact from a PTAB perspective, the fact that an IPR was filed and settled by Nintendo Co., Ltd. suggests that there were perceived invalidity arguments that led to the challenge. The settlement likely includes provisions that prevent Nintendo from further challenging the patent, but these terms are confidential.

Strategic summary

All claims of US9542571 remain UNTESTED by a PTAB final written decision. No claims were canceled, sustained, or otherwise definitively adjudicated by the Board. The single IPR filed (IPR2026-00007) was terminated due to a settlement between the petitioner, Nintendo Co., Ltd. et al., and the patent owner, Malikie Innovations Ltd., before the PTAB made a decision on institution. This means the merits of the invalidity arguments were not formally decided by the PTAB.

Regarding the estoppel landscape, 35 U.S.C. § 315(e)(2) statutory estoppel (which bars petitioners and their privies from raising any ground they raised or reasonably could have raised) does not apply because no final written decision was issued. However, the petitioner (Nintendo Co., Ltd. et al.) and any parties contractually bound by the settlement agreement would likely be estopped from further challenging the patent based on the terms of that confidential agreement. For a new defendant facing assertion of this patent, prior-art grounds are still generally available for challenge, as there has been no PTAB adjudication on the merits that would trigger statutory estoppel.

In terms of pattern signals, only one IPR has been filed against this patent according to the provided data. The petitioner is a prominent operating company (Nintendo), which often indicates a direct impact from the patent or a broader defensive strategy. The patent owner, Malikie Innovations Ltd., appears to have settled the IPR, potentially to avoid the cost and uncertainty of trial or as part of a larger business resolution.

Recommended next steps

Since the IPR (IPR2026-00007) was terminated as settled before an institution decision, no claims of US9542571 have been invalidated by the PTAB. Therefore, there is no Final Written Decision to link to or quote for claim cancellation.

For a defendant currently facing assertion of US9542571, the absence of a PTAB decision on the merits means that the patent has not been hardened through successful PTAB defense, nor has it been narrowed by invalidity findings. You would not be estopped by this IPR from bringing your own validity challenge, assuming you are not in privity with Nintendo and not bound by their confidential settlement agreement.

If facing a demand letter that cites claims of US9542571, the fact that an IPR was filed (even if settled pre-institution) indicates that potential invalidity arguments likely exist. A thorough prior art search would be a prudent next step to identify strong invalidity grounds for an inter partes review or district court defense.