PTAB challenges

Proceedings overview

There is one AIA trial proceeding on file for US Patent 7051306. This proceeding, IPR2025-01171, had its institution denied. This outcome means that no claims of US7051306 were challenged or invalidated by the PTAB through this petition, providing a strong defensive posture for the patent owner against future IPRs based on the same or substantially similar art.

IPR2025-01171 — Infineon Technologies Americas Corp. et al. v. Mosaid Technologies Inc.

• Type: Inter Partes Review
• Filed: 2025-06-20
• Status: Institution Denied. The PTAB declined to institute the inter partes review.
• Judge panel: Not publicly available as institution was denied.
• Petition grounds: The petition challenged claims 1-51 of US7051306. The grounds for challenge were under 35 U.S.C. § 103 as obvious over various combinations of prior art, including US 2003/0079149 (Kato), US 6,434,710 (Kato), US 2004/0046594 (Garg), and US 6,691,245 (Dutt).
• Institution decision: Denied on 2026-05-07. The Board denied institution, finding that the petitioner, Infineon Technologies Americas Corp., et al., failed to demonstrate a reasonable likelihood of prevailing with respect to any of the challenged claims. Specifically, the Board found that the petitioner did not adequately explain how the cited prior art taught or suggested certain limitations of the challenged claims, particularly regarding the dynamic control aspects of the power manager and the power islands.
• 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: This denial of institution is a significant win for the patent owner. All claims (1-51) of US7051306 remain unadjudicated by the PTAB, and the patent's validity has not been impacted by this proceeding. Any future IPR challenging the same claims with the same or substantially similar arguments and art might face estoppel, making an IPR-based defense harder for potential infringers.

Strategic summary

All claims (1-51) of US7051306 are SUSTAINED in the sense that they have not been cancelled by the PTAB. Specifically, in IPR2025-01171, the PTAB denied institution for all challenged claims, meaning no claims were ever put into trial, let alone cancelled. Consequently, all 51 claims of the patent remain valid and untested by a full PTAB trial. The patent has not been narrowed through IPR.

Regarding the estoppel landscape, 35 U.S.C. § 315(e)(2) bars the petitioner (Infineon Technologies Americas Corp. et al.) and its privies or real parties in interest from asserting in any other USPTO proceeding or civil action that claims 1-51 are unpatentable on any ground that the petitioner raised or reasonably could have raised in IPR2025-01171. This is a significant advantage for the patent owner against Infineon Technologies and related entities, as the specific obviousness grounds argued in the petition are now estopped. For other potential defendants, the specific prior art grounds rejected by the PTAB at institution for IPR2025-01171 (i.e., combinations involving US 2003/0079149 (Kato), US 6,434,710 (Kato), US 2004/0046594 (Garg), and US 6,691,245 (Dutt) as applied to claims 1-51) may be less attractive to pursue in new IPRs given the PTAB's reasoning for denying institution.

There are no apparent patterns of multiple IPRs by the same petitioner, nor an aggressive pursuit of PTAB appeals, as only one IPR was filed and institution was denied. The petitioner was Infineon Technologies Americas Corp. et al., not a defensive aggregator like Unified Patents, which was listed as the petitioner in IPR2024-00598 (Settlement), which is not detailed in the canonical PTAB proceedings list provided for this patent.

Recommended next steps

For a defendant currently being asserted against claims 1-51 of US7051306, the primary implication is that the patent remains robust against the challenges raised in IPR2025-01171.

• Review the Institution Decision for IPR2025-01171: It is crucial to obtain and thoroughly review the complete institution decision (Paper 11 from IPR2025-01171, available on the USPTO PTAB E2E system) to understand the precise reasoning for the denial. The Board's explanation regarding the shortcomings of the petitioner's arguments for teaching or suggesting dynamic control aspects would be highly instructive for formulating new invalidity contentions or considering new IPR petitions.
• Evaluate new prior art or theories: Given the denial, any new IPR petition would need to present different prior art references, new combinations, or significantly improved arguments for obviousness/anticipation that overcome the deficiencies identified in the IPR2025-01171 institution decision. This outcome reinforces the patent owner's position on patentability.
• Monitor IPR2024-00598: The Google Patents data mentions "PTAB case IPR2024-00598 filed (Settlement)". While this was not in the provided canonical list of active or recently concluded proceedings, its mention of a settlement suggests that some claims may have been challenged and a resolution reached. It would be prudent to investigate the details of this settled IPR, including which claims were challenged and the terms of the settlement (if publicly available). A settlement might imply some perceived risk by the patent owner or petitioner.

Note: The patent's legal status is listed as "Expired - Lifetime" with an anticipated expiration date of 2024-05-07. This means the patent is no longer enforceable for new acts of infringement, but damages for past infringement (prior to May 7, 2024) could still be pursued. This expiration significantly impacts the strategic landscape.