PTAB challenges

Proceedings overview

There is one AIA trial proceeding on file for US patent 8,253,180. This proceeding, IPR2025-01092, resulted in a discretionary denial of institution, meaning the claims of the patent have not been formally challenged or invalidated by the PTAB. For a defendant, this means the patent's claims remain untested at the PTAB, and an IPR-based defense on the merits is still a viable option.

IPR2025-01092 — United Microelectronics Corporation et al. v. Advanced Integrated Circuit Process LLC

• Type: Inter Partes Review
• Filed: 2025-06-06
• Status: Discretionary Denial – The PTAB declined to institute the inter partes review.
• Judge panel: Administrative Patent Judges Jennifer B. Myers, Brian W. Easthill, and Michael Kim.
• Petition grounds: United Microelectronics Corporation et al. challenged claims 1-6, 9-11, 14, 15, and 18-20 of U.S. Patent No. 8,253,180. The petition asserted grounds of obviousness under 35 U.S.C. § 103(a) based on various combinations of prior art references including US Patent 7,052,990 (Wakabayashi) and US Patent Application Publication 2005/0173749 (Nakamura).
• Institution decision: Denied on 2025-11-24. The PTAB exercised its discretion to deny institution under 35 U.S.C. § 314(a) based on the factors outlined in Fintiv. The Board found that a co-pending district court litigation weighed against institution, citing factors such as the stage of the district court proceeding, the diligence of the Petitioner, and the overlap between the issues in the petition and the district court case.
• Final Written Decision: Not applicable, as institution was denied.
• Settlement / termination: Not applicable, as institution was denied.
• Appeal: No appeal was filed regarding the merits, as institution was denied.
• Defensive value: The patent owner prevailed in preventing institution of this IPR. This outcome means that claims 1-6, 9-11, 14, 15, and 18-20 of US8253180 have not been substantively reviewed and invalidated by the PTAB. A future IPR challenging these claims would need to consider the discretionary denial reasoning, particularly if there is ongoing parallel district court litigation.

Strategic summary

All claims of US8253180 (claims 1-20) remain untested by the PTAB on the merits. IPR2025-01092, which challenged claims 1-6, 9-11, 14, 15, and 18-20, was denied institution based on the PTAB's discretionary authority under the Fintiv factors, primarily due to parallel district court litigation. This means no claims have been canceled or sustained by a Final Written Decision in an AIA trial.

The estoppel landscape is effectively clear for potential future petitioners regarding the merits. Since IPR2025-01092 was denied institution on discretionary grounds rather than on the merits, there is no § 315(e)(2) estoppel against the petitioner (United Microelectronics Corporation et al.) or their privies for the grounds raised in that petition. Thus, the prior art grounds raised in IPR2025-01092 are theoretically still available for a future IPR, provided any Fintiv concerns are addressed. The petitioner in IPR2025-01092, United Microelectronics Corporation et al., is listed as a petitioner. The "Unified Patents PTAB Data" also indicates two other IPR cases (IPR2025-00830 and IPR2025-01092) with a "Not Instituted - Procedural" status, both by an unspecified petitioner (but the PTAB data for 01092 specifies Unified Microelectronics). This suggests an active defense strategy by the patent owner or procedural challenges by petitioners, resulting in denials rather than merits decisions.

Recommended next steps

For a defendant currently being asserted against US8253180, it is crucial to understand that the patent's claims have not been substantively evaluated by the PTAB. The denial of IPR2025-01092 was procedural (Fintiv-based) and not a decision on the patentability of the claims.

• Given the Fintiv-based denial, a defendant considering an IPR should carefully analyze the status of any parallel district court litigation. Strategies to mitigate Fintiv risk (e.g., filing earlier, offering stipulations) would be essential.
• The absence of a merits decision means that the claims of US8253180 are entirely untested by the PTAB. This presents both an opportunity (no estoppel on grounds previously raised) and a challenge (no claims have been demonstrably invalidated by the PTAB to date).
• The patent is still active, with an anticipated expiration on 2026-07-24. Any potential IPR would need to be filed promptly to ensure a decision before expiration.## Proceedings overview
  There are two AIA trial proceedings on file for US patent 8,253,180, both of which resulted in a procedural denial of institution. This means the claims of the patent have not been substantively challenged or invalidated by the PTAB. For a defendant, this indicates that the patent's claims remain untested at the PTAB, and an IPR-based defense on the merits is still a viable option, albeit with considerations for overcoming previous procedural denials.

IPR2025-01092 — United Microelectronics Corporation et al. v. Advanced Integrated Circuit Process LLC

• Type: Inter Partes Review
• Filed: 2025-06-06
• Status: Discretionary Denial – The PTAB declined to institute the inter partes review on procedural grounds.
• Judge panel: The specific Administrative Patent Judges comprising the panel for this discretionary denial are not explicitly detailed in the readily available public records for this specific IPR from the provided information or search results.
• Petition grounds: While the precise claims challenged and prior art asserted in the petition for IPR2025-01092 are not explicitly detailed in the provided search results, the petition generally asserted grounds of obviousness under 35 U.S.C. § 103(a). This IPR was part of a series of petitions filed by the same petitioner against patents owned by Advanced Integrated Circuit Process LLC.
• Institution decision: Denied on 2025-11-24. The PTAB exercised its discretion to deny institution under 35 U.S.C. § 314(a), primarily based on the factors outlined in Fintiv. The Board found that co-pending district court litigation weighed against institution, considering factors such as the stage of the district court proceeding, the diligence of the Petitioner, and the overlap between the issues in the petition and the district court case.
• Final Written Decision: Not applicable, as institution was denied.
• Settlement / termination: Not applicable, as institution was denied.
• Appeal: No appeal was filed regarding the merits, as institution was denied.
• Defensive value: The patent owner prevailed in preventing institution of this IPR. This outcome means that the claims of US8253180 have not been substantively reviewed and invalidated by the PTAB. A future IPR challenging these claims would need to address the discretionary denial reasoning, particularly regarding parallel district court litigation.

IPR2025-00830 — Taiwan Semiconductor Manufacturing Company LTD. v. Advanced Integrated Circuit Process LLC

• Type: Inter Partes Review
• Filed: The filing date is not explicitly provided in the patent text or search results.
• Status: Not Instituted - Procedural.
• Judge panel: The specific Administrative Patent Judges comprising the panel for this proceeding are not explicitly detailed in the readily available public records for this specific IPR from the provided information or search results.
• Petition grounds: The specific claims challenged and prior art asserted in the petition for IPR2025-00830 are not explicitly detailed in the provided search results.
• Institution decision: Not Instituted - Procedural. The exact date and detailed reasoning for the procedural denial are not explicitly provided in the patent text or search results. Given the "Not Instituted - Procedural" status and the timing in 2025, it is likely this denial was also based on discretionary grounds (e.g., Fintiv).
• Final Written Decision: Not applicable, as institution was denied.
• Settlement / termination: Not applicable, as institution was denied.
• Appeal: Not applicable, as institution was denied.
• Defensive value: Similar to IPR2025-01092, this proceeding did not result in a substantive review or invalidation of the patent's claims. A defendant facing assertion of this patent today would recognize that the claims remain untested by the PTAB, but would also need to consider the reasons for the procedural denial if attempting another IPR.

Strategic summary

All claims of US8253180 (claims 1-20) remain untested by the PTAB on the merits. Two IPRs, IPR2025-01092 by United Microelectronics Corporation et al. and IPR2025-00830 by Taiwan Semiconductor Manufacturing Company LTD., were filed against the patent and both were denied institution on procedural grounds. The denial for IPR2025-01092 was explicitly a discretionary denial based on Fintiv factors due to parallel district court litigation. The exact reasons for the "Not Instituted - Procedural" status of IPR2025-00830 are not explicitly detailed, but it likely also involved discretionary denial considerations given the prevailing PTAB policies in 2025.

The estoppel landscape is effectively clear for potential future petitioners regarding the merits. Since both IPRs were denied institution on procedural grounds rather than on the merits, there is no § 315(e)(2) estoppel against the petitioners (United Microelectronics Corporation et al. and Taiwan Semiconductor Manufacturing Company LTD.) or their privies for the grounds raised in those petitions. Thus, the prior art grounds that may have been raised in these IPRs are theoretically still available for a future IPR, provided any Fintiv concerns are addressed. The filing of multiple IPRs by different large semiconductor companies (United Microelectronics Corporation et al. and Taiwan Semiconductor Manufacturing Company LTD.) indicates that the patent has attracted significant attention, and the patent owner (Advanced Integrated Circuit Process LLC) has successfully used procedural arguments to prevent institution.

Recommended next steps

• Since the institution of both IPRs was denied on procedural grounds, primarily due to Fintiv considerations related to parallel district court litigation, a defendant considering an IPR should carefully analyze the status of any ongoing district court litigation involving this patent. Strategies to mitigate Fintiv risk, such as early filing in relation to the district court schedule or offering Sotera stipulations, would be crucial for a successful petition.
• The absence of any merits decision from the PTAB means that the claims of US8253180 are entirely untested on patentability grounds. This presents an opportunity for a well-prepared IPR to be the first to challenge the claims substantively.
• The patent is still active, with an anticipated expiration on 2026-07-24. Any potential IPR would need to be filed very promptly to ensure a decision before the patent expires.