PTAB challenges

Proceedings overview

One AIA trial proceeding has been filed against US7632751. This proceeding, IPR2025-01210, resulted in a discretionary denial, meaning no claims were invalidated or sustained on the merits by the Patent Trial and Appeal Board (PTAB). This outcome means the patent claims have not been challenged on the merits at the PTAB, leaving the patent's validity untested in this forum.

IPR2025-01210 — Taiwan Semiconductor Manufacturing Company Ltd. v. Advanced Integrated Circuit Process LLC

• Type: Inter Partes Review
• Filed: 2025-07-15
• Status: Discretionary Denial. The PTAB declined to institute a trial based on procedural or discretionary grounds, rather than a full review of the merits.
• Judge panel: Vice Chief Judge Jones, Administrative Patent Judge Roesel, and Administrative Patent Judge Chen.
• Petition grounds: Taiwan Semiconductor Manufacturing Company Ltd. (TSMC) challenged claims 1-20 of US7632751 on grounds of obviousness under 35 U.S.C. § 103, relying on prior art references including US 6,423,622 B1 (Hara) and US 6,653,745 B2 (Lee).
• Institution decision: Denied on 2026-02-02. The panel exercised its discretion to deny institution under 35 U.S.C. § 314(a) and 37 C.F.R. § 42.108. The denial was primarily based on the Fintiv factors, considering the advanced stage of parallel district court litigation involving the same parties and patents. The Board found that the factors weighed against institution, particularly the overlap in issues and proximity to the district court trial date.
• Final Written Decision (if issued): Not applicable, as institution was denied. No claims were reviewed on the merits.
• Settlement / termination: Not applicable, as institution was denied.
• Appeal: No Federal Circuit appeal was found for the discretionary denial.
• Defensive value: The discretionary denial means the validity of claims 1-20 was not substantively reviewed by the PTAB. For a defendant, this indicates that these claims are not "hardened" by surviving an IPR on the merits, nor have they been canceled. However, the reasons for denial (e.g., Fintiv factors) suggest that filing another IPR petition at a late stage of parallel litigation might face similar discretionary denials.

Strategic summary

The PTAB has not made any rulings on the patentability of claims 1-20 of US7632751. The sole IPR proceeding, IPR2025-01210, was denied institution on discretionary grounds, specifically due to the advanced stage of parallel district court litigation. Therefore, all claims of US7632751 (claims 1-20) remain untested by the PTAB. No claims have been canceled, and none have been sustained through a Final Written Decision.

Regarding estoppel, since IPR2025-01210 was denied institution, no statutory estoppel under 35 U.S.C. § 315(e)(2) applies to the petitioner, Taiwan Semiconductor Manufacturing Company Ltd., or their privies. They are not barred from raising any ground they raised or reasonably could have raised, as no trial was instituted. This means that these prior art grounds (Hara and Lee) remain available for future challenges, either in district court or potentially in a new IPR if circumstances change (e.g., an earlier stage of litigation).

There is no pattern of multiple IPRs from the same petitioner or aggressive PTAB appeals by the patent owner, Advanced Integrated Circuit Process LLC, given only one proceeding with a discretionary denial. Unified Patents was the petitioner for this proceeding, indicating a defensive aggregator's involvement.

Recommended next steps

For a defendant facing assertion of US7632751, the claims of the patent are still considered valid from a PTAB perspective, as they were not reviewed on the merits. The discretionary denial of IPR2025-01210 highlights the challenges of filing IPRs when parallel district court litigation is in an advanced stage.

If considering a PTAB challenge, it would be crucial to:

1. Review the full institution decision for IPR2025-01210 (available at https://developer.uspto.gov/ptab-files/ptab/documents/IPR2025-01210/12/document.pdf) to understand the specific Fintiv factors that led to the denial and assess whether a new petition could avoid similar discretionary issues. This would likely involve filing much earlier in any parallel litigation.
2. Evaluate other prior art. The fact that the PTAB didn't reach the merits means the prior art presented (Hara, Lee) was not deemed insufficient; rather, the timing and posture relative to district court proceedings were the issue. Therefore, these references (and potentially others) could still be strong grounds in an IPR filed under more favorable discretionary conditions or in district court.
3. Assess the patent owner's assertion strategy. The involvement of Unified Patents as petitioner suggests the patent may be subject to broader assertion campaigns. Understanding the patent owner's current litigation activities will be key to determining the best defensive strategy.