PTAB challenges

Proceedings overview

One AIA trial proceeding has been filed against US patent 11538763. This Inter Partes Review (IPR) is currently in the "Trial Instituted" phase, meaning the Patent Trial and Appeal Board (PTAB) has found a reasonable likelihood that at least one challenged claim is unpatentable. For a defendant facing assertion of this patent, this indicates that the patent's validity is currently being challenged and no claims have been definitively upheld or invalidated by the PTAB yet.

IPR2026-00066 — Taiwan Semiconductor Manufacturing Company Ltd. et al. v. Myw Semitech LLC

• Type: Inter Partes Review
• Filed: 2025-11-21
• Status: Trial Instituted (The PTAB has determined that the petitioner has a reasonable likelihood of prevailing with respect to at least one challenged claim and has authorized the trial to proceed).
• Judge panel: Undisclosed publicly at this time based on available information.
• Petition grounds: The specific claims challenged, prior art asserted, and statutory bases (§ 102 / § 103 / § 112) are not publicly detailed in the provided information or readily available from general searches at this "Trial Instituted" stage without access to the full petition and institution decision documents.
• Institution decision: Instituted. The exact date of institution and the panel's reasoning are not explicitly provided in the initial data, but the status "Trial Instituted" confirms this outcome. The Unified Patents PTAB data indicates the case was filed on 2025-11-21 and last modified on 2026-05-22 with a status of "Trial Instituted". This implies the institution decision was issued around the modification date.
• Final Written Decision (if issued): Not yet issued. The proceeding is in the trial phase.
• Settlement / termination: No settlement or termination has been publicly reported.
• Appeal: Not applicable, as no Final Written Decision has been issued.
• Defensive value: As the IPR has been instituted, it indicates that the PTAB found the challenge to at least one claim sufficiently strong to proceed to trial. This means the validity of US11538763 is actively under scrutiny. Any infringement theory based on claims under challenge in this IPR faces significant risk if those claims are ultimately found unpatentable.

Strategic summary

Currently, all claims of US11538763 remain untested by a Final Written Decision, as the single identified IPR (IPR2026-00066) is in the "Trial Instituted" phase. This means no claims have been canceled or sustained by the PTAB yet.

Regarding the estoppel landscape, since IPR2026-00066 has been instituted, Taiwan Semiconductor Manufacturing Company Ltd. et al. (and their privies) will be estopped under § 315(e)(2) from asserting in any other proceeding before the USPTO, the International Trade Commission, or any district court of the United States, that a claim is invalid on any ground that the petitioner raised or reasonably could have raised during the IPR. For a defendant not privy to this IPR, most prior-art grounds would theoretically still be available for a new challenge, though the institution of this IPR suggests that strong prior art has already been identified and is being litigated.

No clear pattern signals are available as only one IPR proceeding is currently on file for this patent. The involvement of Unified Patents as a source for litigation data may suggest a defensive aggregation strategy by the petitioner, but without more context or additional filings, this is speculative.

Recommended next steps

If you are a defendant facing assertion of US11538763, closely monitor IPR2026-00066. The patent's validity is currently being challenged, which could significantly impact any litigation. The PTAB has a statutory deadline to issue a Final Written Decision within one year of institution. Given the filing date of 2025-11-21 and a "last modified" date of 2026-05-22 for "Trial Instituted", the Final Written Decision would likely be due around May 2027. Accessing the publicly available petition and institution decision for IPR2026-00066 on the USPTO PTAB E2E system would provide critical details on the specific claims challenged and the prior art relied upon.The search results provide some general context about recent changes to PTAB proceedings and IPR institution rates under Director John Squires, but they do not provide specific details for IPR2026-00066 such as the institution decision date, claims challenged, or judge panel. The information from the initial prompt states "last modified 2026-05-22 — status: Trial Instituted", which implies the institution decision was made around this time. Without direct access to the PTAB docket for this specific case, I cannot provide these granular details.

Therefore, I need to state clearly what information is not available.

Revised plan:

1. Proceedings overview: Keep as is, noting the "Trial Instituted" status.
2. For IPR2026-00066:
   • Type, Filed, Status, Petitioner, Patent Owner: Use the provided data.
   • Judge panel: State that it's undisclosed publicly at this time based on available information.
   • Petition grounds: State that specific claims challenged, prior art, and statutory bases are not publicly detailed without access to the full petition and institution decision documents.
   • Institution decision: State that it was instituted, and while the exact date isn't known, it was around the "last modified" date (2026-05-22). Explain what "Trial Instituted" means.
   • Final Written Decision (FWD), Settlement / termination, Appeal: State not applicable yet.
   • Defensive value: Reiterate its implications.
3. Strategic summary:
   • Claims: Reiterate that all claims are currently untested by a FWD.
   • Estoppel: Explain estoppel for the petitioner once a FWD is issued.
   • Pattern signals: Note that with only one IPR, patterns are limited. Mention the source of litigation data (Unified Patents) as a potential signal.
4. Recommended next steps:
   • Emphasize monitoring the active proceeding.
   • Note the statutory 1-year deadline for FWD.
   • Recommend accessing the petition/institution decision for details.

I will use the "last modified" date (2026-05-22) from the provided structured data as an approximate date for the institution decision, as the status changed to "Trial Instituted" by then.

Final check of constraints:

• Don't fabricate: I will clearly state when information is not available.
• Quote claim numbers exactly: N/A as claims are not yet detailed.
• Date format YYYY-MM-DD: Will use this.
• Link to USPTO PTAB E2E or CourtListener: I will mention these as sources for the user to look up, but since I don't have direct links to a specific FWD or CAFC opinion for this IPR, I won't provide a direct link for it.
• Build on previously generated sections: Yes.

One more quick search to see if any specific institution date or claims for IPR2026-00066 are available through a more direct PTAB search query, though the general searches didn't yield them.

Search Query:
6. "IPR2026-00066 USPTO PTAB"## Proceedings overview

One AIA trial proceeding has been filed against US patent 11538763. This Inter Partes Review (IPR) is currently in the "Trial Instituted" phase, meaning the Patent Trial and Appeal Board (PTAB) has found a reasonable likelihood that at least one challenged claim is unpatentable. For a defendant facing assertion of this patent, this indicates that the patent's validity is currently being challenged and no claims have been definitively upheld or invalidated by the PTAB yet.

IPR2026-00066 — Taiwan Semiconductor Manufacturing Company Ltd. et al. v. Myw Semitech LLC

• Type: Inter Partes Review
• Filed: 2025-11-21
• Status: Trial Instituted (The PTAB has determined that the petitioner has a reasonable likelihood of prevailing with respect to at least one challenged claim and has authorized the trial to proceed. The case was last modified on 2026-05-22, indicating the institution decision occurred around this time.)
• Judge panel: The specific judge panel for this IPR is not publicly disclosed at this time based on available information.
• Petition grounds: The specific claims challenged, prior art asserted, and statutory bases (§ 102 / § 103 / § 112) are not publicly detailed in the provided information or readily available from general searches at this "Trial Instituted" stage without access to the full petition and institution decision documents.
• Institution decision: Instituted. While the exact date of institution is not explicitly stated in the provided data, the status update to "Trial Instituted" as of 2026-05-22 confirms this outcome. The institution means the PTAB found the petition to demonstrate a reasonable likelihood that at least one challenged claim of US11538763 is unpatentable.
• Final Written Decision (if issued): Not yet issued. The proceeding is currently in the trial phase.
• Settlement / termination: No settlement or termination has been publicly reported for this proceeding.
• Appeal: Not applicable, as no Final Written Decision has been issued.
• Defensive value: The institution of this IPR signifies that the PTAB found the challenge to at least one claim of US11538763 sufficiently strong to warrant a full trial. This means the validity of the patent is actively under scrutiny. Any infringement theory based on claims currently challenged in IPR2026-00066 faces significant risk if those claims are ultimately found unpatentable by the PTAB.

Strategic summary

All claims of US11538763 are currently untested by a Final Written Decision, as the sole identified IPR (IPR2026-00066) is in the "Trial Instituted" phase. Therefore, no claims have been definitively canceled or sustained by the PTAB at this juncture.

Regarding the estoppel landscape, once a Final Written Decision is issued in IPR2026-00066, the petitioner, Taiwan Semiconductor Manufacturing Company Ltd. et al., and any parties in privy with them, will be estopped under 35 U.S.C. § 315(e)(2) from asserting in any other proceeding before the USPTO, the International Trade Commission, or any district court of the United States, that a claim is invalid on any ground that the petitioner raised or reasonably could have raised during the IPR. For a defendant not privy to this IPR, most prior-art grounds would theoretically still be available for a new challenge, though the institution of this IPR suggests that strong prior art has already been identified and is being litigated.

With only one IPR proceeding currently on file for this patent, there are limited pattern signals to discern. The petitioner's identity and the public record from Unified Patents indicate that a defensive aggregator or a large operating company is involved in challenging the patent.

Recommended next steps

If you are a defendant facing assertion of US11538763, it is crucial to closely monitor IPR2026-00066. The patent's validity is actively being challenged, which could significantly impact any ongoing or future litigation. The PTAB has a statutory deadline to issue a Final Written Decision within one year of institution. Given that the IPR was last modified with a "Trial Instituted" status on 2026-05-22, the Final Written Decision is expected around May 2027.

It is highly recommended to obtain and review the publicly available petition and institution decision documents for IPR2026-00066 from the USPTO PTAB E2E system. These documents will provide precise details on the specific claims challenged and the prior art relied upon, which are essential for evaluating the strength of the patent and informing your defensive strategy.