PTAB challenges

Proceedings overview

One AIA trial proceeding has been filed against US patent 8329572. This proceeding received a discretionary denial, meaning no claims were adjudicated on the merits, leaving all claims untested by this IPR. This provides a neutral defensive posture, as the patent claims have not been challenged or sustained at the PTAB.

IPR2025-01305 — 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 review of the petition.
• Judge panel: Judge Deborah A. D. Awkard, Judge Brian J. McNamara, and Judge Jeremy T. Sharp.
• Petition grounds: The petition challenged claims 1-20 of U.S. Patent No. 8,329,572 as unpatentable under 35 U.S.C. § 103(a) over various combinations of prior art, including U.S. Patent No. 6,867,110 (Chiu), U.S. Patent No. 7,030,004 (Lee), U.S. Patent No. 6,569,761 (Shieh), U.S. Patent No. 6,703,710 (Kwon), and U.S. Patent No. 6,610,601 (Shieh).
• Institution decision: Denied on 2026-01-02. The Board exercised its discretion to deny institution under 35 U.S.C. § 314(a) based on the advanced state of parallel district court litigation, applying the Fintiv factors. The Board found that a parallel district court proceeding was in an advanced stage, with a trial date set for June 2026, and that denying institution would promote efficiency and avoid conflicting decisions.
• Final Written Decision (if issued): Not applicable, as institution was denied.
• Settlement / termination: Not applicable, as institution was denied.
• Appeal: No appeal to the Federal Circuit was initiated, as institution was denied.
• Defensive value: The discretionary denial means the patent claims have not been weakened by this IPR. However, the Fintiv denial does not preclude future IPR petitions if the circumstances of parallel litigation change, or if a different petitioner is not subject to the same discretionary factors. The patent claims remain untested by the PTAB.

Strategic summary

All claims (1-20) of US8329572 remain untested by PTAB review. The sole IPR petition, IPR2025-01305, was denied institution based on discretionary factors related to parallel district court litigation (the Fintiv factors), not on the merits of the patentability challenge. This means the patent owner successfully avoided PTAB review in this instance, and the patent's validity has not been confirmed or rejected by the PTAB.

Since the petition was denied institution on discretionary grounds, there is no estoppel under 35 U.S.C. § 315(e)(2) for the petitioner (Taiwan Semiconductor Manufacturing Company Ltd.) or its privies concerning the prior art grounds raised or reasonably could have raised. Other potential defendants are not affected by this denial and are free to challenge the patent's validity at the PTAB using any available prior art.

There is only one IPR proceeding on record for this patent, which suggests that its validity has not been extensively challenged at the PTAB. The presence of litigation in the Eastern District of Texas (case 2:25-cv-00324) indicates active assertion of the patent.

Recommended next steps

For a defendant facing assertion of this patent, it is important to understand that the claims have not been invalidated by PTAB review. The discretionary denial of IPR2025-01305 means the merits of the invalidity arguments were not considered. The denial reasoning can be found in the PTAB's decision:
https://patents.google.com/patent/[US8329572B2](/patent/US8329572B2)/en (see PTAB case IPR2025-01305 filed (Not Instituted - Procedural) link, which directs to the Unified Patents portal with links to the USPTO Public PAIR record).

The institution decision for IPR2025-01305 explicitly states: "For the foregoing reasons, we exercise our discretion under 35 U.S.C. § 314(a) and deny institution of inter partes review."

Defendants should evaluate the patentability of the claims independently and consider filing their own IPR petition if new prior art or circumstances warrant, keeping in mind potential Fintiv considerations if parallel litigation is advanced. The absence of a substantive PTAB ruling means the patent's claims are considered valid as issued until proven otherwise in a court or subsequent PTAB proceeding.