PTAB challenges

Proceedings overview

There is currently one active AIA trial proceeding on US Patent 8076735, an Inter Partes Review (IPR), IPR2026-00220. The proceeding is pending, meaning no claims have been invalidated or sustained yet. This gives a defendant limited immediate defensive posture based on PTAB outcomes, as the patent's claims remain currently enforceable.

IPR2026-00220 — Taiwan Semiconductor Manufacturing Company Ltd. v. [Marlin Semiconductor Ltd.](/litigations/by-defendant/Marlin%20Semiconductor%20Ltd.)

• Type: Inter Partes Review
• Filed: 2026-01-16
• Status: Pending. The proceeding is ongoing and has not yet reached a final decision.
• Judge panel: Not yet publicly available.
• Petition grounds: Not yet publicly available. Details on specific claims, prior art, and statutory bases (§ 102 / § 103 / § 112) will become available after institution.
• Institution decision: Not yet issued. The deadline for the institution decision is typically six months from the filing date.
• Final Written Decision (if issued): Not applicable, as the proceeding is pending.
• Settlement / termination: Not applicable, as the proceeding is pending.
• Appeal: Not applicable, as the proceeding is pending.
• Defensive value: This proceeding is in its early stages. While it indicates a challenge to the patent's validity, no claims have been impacted yet. A defendant facing assertion of this patent should monitor this IPR closely, as a successful challenge could significantly weaken the patent owner's position.

Strategic summary

Currently, all claims of US8076735 are UNTESTED in a final PTAB decision, as the single IPR (IPR2026-00220) is still pending. No claims have been canceled or explicitly sustained by a Final Written Decision.

Regarding the estoppel landscape, if IPR2026-00220 proceeds to a Final Written Decision, § 315(e)(2) will bar the petitioner, Taiwan Semiconductor Manufacturing Company Ltd., and its privies from raising any ground that was raised or reasonably could have been raised in the IPR. For a defendant currently being asserted against, this means that if they are not in privy with the petitioner, they might still be able to use the same prior art or even different prior art in a new IPR, depending on the grounds ultimately instituted and decided upon in IPR2026-00220.

There are no apparent pattern signals of multiple IPRs filed by the same petitioner or aggressive PTAB appeals by the patent owner at this time, given that only one IPR is on file and it is still pending. The petitioner is Taiwan Semiconductor Manufacturing Company Ltd., a significant entity in the semiconductor industry.

Recommended next steps

If you are a defendant facing assertion of US8076735, your primary next step should be to closely monitor IPR2026-00220. Key upcoming milestones include the institution decision deadline (typically 6 months from the filing date of 2026-01-16, so around 2026-07-16), and, if instituted, the subsequent trial-stage milestones leading to a Final Written Decision within one year of institution. You can track its progress on the USPTO PTAB E2E system by searching for IPR2026-00220.