PTAB challenges

Proceedings overview

There is one AIA trial proceeding on file for US Patent 9,786,510, which resulted in a discretionary denial of institution. This means the patent claims were not substantively challenged and remain in force. For a defendant, this indicates that the patent has not been narrowed or invalidated by this PTAB proceeding, and any defensive posture would need to consider the full scope of the claims.

IPR2025-01484 — Taiwan Semiconductor Manufacturing Company Ltd. v. United Microelectronics Corp.

• Type: Inter Partes Review
• Filed: 2025-08-29
• Status: Discretionary Denial - The PTAB declined to institute review.
• Judge panel: Not publicly available at this stage of the proceeding, as institution was denied.
• Petition grounds: Information regarding specific claims, prior art, and statutory bases (§ 102 / § 103 / § 112) is not publicly detailed for discretionary denials in the provided information.
• Institution decision: Denied (date: 2026-04-14). The status "Discretionary Denial" indicates that the PTAB exercised its discretion to deny institution, rather than making a decision on the merits of the patentability challenge.
• Final Written Decision (if issued): Not issued, as institution was denied.
• Settlement / termination: Not applicable, as institution was denied.
• Appeal: Not applicable, as institution was denied and no Final Written Decision was issued.
• Defensive value: This proceeding does not impact the patentability of the claims of US 9,786,510. The patent owner prevailed on the procedural ground of discretionary denial, meaning the claims were not substantively reviewed. An IPR-based defense will need to be prepared from scratch, potentially raising different arguments or prior art, or seeking a different outcome at institution.

Strategic summary

All claims of US Patent 9,786,510 remain untested and sustained by virtue of the discretionary denial of institution in IPR2025-01484. The patent has not been narrowed or invalidated through this PTAB proceeding.

Regarding estoppel, since institution was denied on discretionary grounds, the petitioner (Taiwan Semiconductor Manufacturing Company Ltd.) may not be estopped from raising the same or similar grounds in future proceedings, depending on the specific reasoning for the discretionary denial and whether the merits were genuinely considered. However, the exact estoppel landscape would depend on the detailed reasoning provided in the institution denial decision, which is not fully available in the provided text. For a defendant currently being asserted against, all prior-art grounds remain potentially available.

There is no pattern of multiple IPRs on this patent or aggressive PTAB appeals by the patent owner based on the information provided. The petitioner in the single proceeding, Taiwan Semiconductor Manufacturing Company Ltd., is a known entity in the semiconductor industry and is not typically a defensive aggregator like Unified Patents.

Recommended next steps

Given the discretionary denial in IPR2025-01484, any defendant facing assertion of US 9,786,510 should be aware that the claims remain fully intact. A copy of the institution denial decision for IPR2025-01484 should be obtained to understand the precise reasons for the discretionary denial, as this could inform future PTAB strategy. The USPTO PTAB E2E system would provide the full decision. If considering a new IPR, a defendant would need to carefully assess whether to submit a petition with different grounds or arguments, addressing the potential concerns that led to the discretionary denial.