Litigation summary

As of April 26, 2026, U.S. Patent No. 10,598,101 is involved in active litigation in both U.S. District Courts and in post-grant proceedings before the Patent Trial and Appeal Board (PTAB). The patent holder, Champion Power Equipment, Inc., is asserting the patent in infringement lawsuits against competitors, and the patent is concurrently being challenged by some of those same competitors at the PTAB.

District Court Litigation

1. Champion Power Equipment Inc. v. Generac Power Systems Inc.

• Plaintiff: Champion Power Equipment Inc.
• Defendant: Generac Power Systems Inc.
• Jurisdiction: U.S. District Court for the Eastern District of Wisconsin
• Case Number: 2:24-cv-01281
• Filing Date: October 9, 2024
• Status: This case is ongoing. Champion has alleged that five models of Generac's portable generators infringe on eleven of its patents, including U.S. Patent No. 10,598,101. Generac has responded by filing counterclaims of non-infringement and invalidity for the eleven patents. The parties have been engaged in motion practice, including motions for a protective order and a motion to sever counterclaims.

2. Champion Power Equipment Inc. v. Westinghouse Electric Corp., et al.

• Plaintiff: Champion Power Equipment Inc.
• Defendant: Westinghouse Electric Corp. and several subsidiaries
• Jurisdiction: U.S. District Court for the District of Nevada
• Case Number: 2:25-cv-00844
• Filing Date: May 14, 2025
• Status: This case is ongoing. The complaint alleges that certain multi-fuel generators sold by Westinghouse infringe ten of Champion's patents, including U.S. Patent No. 10,598,101.

Patent Trial and Appeal Board (PTAB) Litigation

In addition to the district court cases, U.S. Patent No. 10,598,101 is the subject of an inter partes review (IPR) proceeding before the PTAB. An IPR is a trial proceeding conducted at the U.S. Patent and Trademark Office to review the patentability of one or more claims in a patent.

1. Harbor Freight Tools USA Inc., Generac Power Systems, Inc., and MWE Investments, LLC v. Champion Power Equipment, Inc.

• Petitioner(s): Harbor Freight Tools USA Inc., Generac Power Systems, Inc., and MWE Investments, LLC
• Patent Owner: Champion Power Equipment, Inc.
• Jurisdiction: U.S. Patent and Trademark Office, Patent Trial and Appeal Board
• Case Number: IPR2025-00951
• Filing Date: 2025
• Status: This IPR proceeding is currently pending before the PTAB. The petitioners are challenging the validity of claims in the '101 patent. Procedural orders have been issued in the case, including an order regarding the substitution of legal counsel for the patent owner. This proceeding is part of a broader dispute between Champion and its competitors, which has involved multiple IPR petitions targeting Champion's patents.