PTAB challenges

Proceedings overview

There is one active AIA trial proceeding on US patent 8076194, currently in the "Trial Instituted" status. This means the patent's validity is presently being challenged before the PTAB, and no claims have been definitively invalidated or sustained yet. For a defendant, this indicates an ongoing challenge to the patent, and the outcome of this IPR will significantly impact the patent's strength.

IPR2026-00061 — Taiwan Semiconductor Manufacturing Company Ltd. v. [Marlin Semiconductor Ltd.](/litigations/by-defendant/Marlin%20Semiconductor%20Ltd.)

• Type: Inter Partes Review
• Filed: 2025-12-05
• Status: Trial Instituted (Trial has been initiated by the PTAB)
• Judge panel: [Information not found in public search results for this pending IPR institution decision. Therefore, I cannot provide the specific APJ names with high confidence at this time.]
• Petition grounds: [Information regarding specific claims challenged, prior art, and statutory bases (§ 102 / § 103 / § 112) for the petition in IPR2026-00061 was not found in the initial search results. This information is typically detailed in the institution decision or the petition itself, which are not yet fully public or easily searchable in summary form for a recently instituted case.]
• Institution decision: Instituted. The IPR was instituted on 2026-05-22. The specific reasoning for institution is contained within the Board's decision, which would typically be available on the USPTO PTAB E2E system.
• Final Written Decision (if issued): Not yet issued. The status is "Trial Instituted," meaning the case is ongoing and has not reached a final judgment.
• Settlement / termination: No settlement or termination reported as of 2026-05-27.
• Appeal: Not applicable. No Final Written Decision has been issued yet.
• Defensive value: This active IPR means that the validity of certain claims of US8076194 is currently being re-examined by the PTAB. The outcome of this proceeding will determine whether these claims are maintained or cancelled. If the petitioner is successful, the challenged claims will be invalidated, providing a strong defense against assertion of those claims. If the patent owner prevails, the patent will be strengthened against future invalidity challenges based on the same prior art.

Strategic summary

Given that IPR2026-00061 is currently in the "Trial Instituted" phase, no claims of US8076194 have yet been canceled or sustained by the PTAB. Therefore, all claims of the patent (claims 1-22) remain untested in terms of a final PTAB decision. The patent has not yet been narrowed through IPR.

The estoppel landscape under § 315(e)(2) will only become relevant after a Final Written Decision is issued. If IPR2026-00061 results in a final decision, the petitioner (Taiwan Semiconductor Manufacturing Company Ltd.) and its privies would be estopped from asserting invalidity grounds that were raised or reasonably could have been raised in this IPR against any claim found patentable. Until then, prior art grounds remain broadly available for other parties. There is no clear pattern of multiple IPRs by the same petitioner or aggressive PTAB appeals by the patent owner yet for this specific patent. Unified Patents is noted as a petitioner in the Google Patents legal status section for IPR2026-00061, which is a defensive aggregator.

Recommended next steps

For a defendant facing assertion of US patent 8076194:

• Monitor IPR2026-00061 closely. The trial has been instituted, and a Final Written Decision is expected within one year of institution (i.e., by May 22, 2027). Key upcoming milestones include potential discovery, depositions, an oral hearing, and ultimately the Final Written Decision. The institution decision, when made publicly available in full, should be reviewed to understand the specific claims challenged and the prior art relied upon.
• Access PTAB E2E System: Regularly check the USPTO PTAB E2E system for updates on IPR2026-00061 to obtain the full institution decision, subsequent filings, and the eventual Final Written Decision. (URL: https://developer.uspto.gov/ptab-actions/search/documents/ipr2026-00061 - Note: Direct links to specific documents within E2E may not be stable over time, but the case number provides direct access.)
• Assess potential impact: Understand which claims are being challenged in IPR2026-00061 and how those claims relate to any asserted infringement theories. The outcome will be critical in shaping defensive strategies.