PTAB challenges

Proceedings overview

There is one AIA trial proceeding on file for US Patent 7960955. The petition for Inter Partes Review (IPR2026-00165) was denied institution via a discretionary denial. This outcome means no claims of US7960955 were challenged on the merits at the PTAB, leaving the patent's claims intact from an IPR perspective. For a defendant, this suggests the patent remains hardened against this specific IPR challenge.

IPR2026-00165 — Monolithic Power Systems, Inc. v. Reed Semiconductor Corp.

• Type: Inter Partes Review
• Filed: 2025-12-01
• Status: Discretionary Denial. This indicates that the Patent Trial and Appeal Board (PTAB) declined to institute the IPR based on discretionary factors, rather than on the merits of the obviousness/anticipation arguments. The proceeding concluded without a trial.
• Judge panel: Information regarding the specific judge panel for this discretionary denial is not immediately available from the provided data.
• Petition grounds: Details on which claims were challenged, the specific prior art asserted, and the statutory bases (§ 102 / § 103) are not available without access to the petition filing.
• Institution decision: Denied. The petition was filed on 2025-12-01. The last modification date of 2026-05-15, coupled with the "Discretionary Denial" status, indicates that the institution decision occurred around that time, within the statutory six-month deadline from the filing date for institution decisions. The specific reasoning for the discretionary denial would be outlined in the PTAB's decision to deny institution.
• Final Written Decision: Not applicable, as the petition was denied institution.
• Settlement / termination: Not applicable, as the petition was denied institution.
• Appeal: Given the discretionary denial, an appeal to the Federal Circuit is possible but the docket information is not available.
• Defensive value: The discretionary denial means the PTAB did not reach the merits of the patentability challenge. Therefore, no claims of US7960955 were invalidated by this proceeding. For a defendant, this particular IPR does not offer a direct path to invalidate claims but signals that Monolithic Power Systems, Inc.'s specific arguments or strategy did not meet the PTAB's discretionary thresholds for institution.

Strategic summary

As of the current date, only one PTAB proceeding, IPR2026-00165, has been filed against US Patent 7960955. This proceeding resulted in a discretionary denial of institution, meaning the PTAB did not proceed to a full trial on the merits of the patentability challenge. Consequently, all claims of US7960955 remain UNTESTED by the PTAB in terms of validity challenges, as no Final Written Decision has been issued, and no claims have been canceled or held patentable through a trial.

The estoppel landscape under § 315(e)(2) for this patent is currently non-existent, as institution was denied. This means the petitioner, Monolithic Power Systems, Inc., and its privies are not estopped from raising grounds that were raised or reasonably could have been raised in a future proceeding, as the denial was discretionary and not on the merits. However, the exact basis of the discretionary denial (e.g., related litigation, serial petition issues) could impact future petitions by the same party. The absence of an instituted trial means that other potential defendants are not estopped and remain free to challenge the patent on any grounds they deem appropriate, subject to the statutory requirements for filing an IPR.

There isn't a clear pattern signal yet with only one proceeding. The denial of institution does not provide insight into the patent owner's (Reed Semiconductor Corp.) litigation strategy beyond successfully fending off this specific challenge at the institution phase. The involvement of Monolithic Power Systems, Inc. as a petitioner indicates a potential interest in challenging this patent, but their specific motivations and the grounds they asserted are not public without reviewing the petition itself. The "discretionary denial" status means the denial was based on factors beyond the mere likelihood of proving unpatentability, which could include considerations like concurrent district court litigation or other policy considerations by the PTAB.

Recommended next steps

For a defendant facing assertion of US7960955 today, it is important to understand the specific reasons for the discretionary denial of IPR2026-00165. This would typically be detailed in the PTAB's decision to deny institution. Reviewing the institution denial decision for IPR2026-00165 is crucial to understand the PTAB's reasoning and assess the strength of the patent owner's arguments against institution and the PTAB's discretionary practices. Unfortunately, the public facing PTAB data on Google Patents does not include a direct link to the institution decision for IPR2026-00165. You would need to access the USPTO PTAB E2E system directly with the proceeding number IPR2026-00165 to retrieve the full order.

Given that no claims have been invalidated, and the patent's validity has not been tested on the merits at the PTAB, any infringement theories citing claims of US7960955 would need to be evaluated against prior art independently. The discretionary denial means that the avenue of IPR is still open for other parties or potentially for Monolithic Power Systems, Inc. with a revised petition, depending on the specifics of the denial.