The lawsuit alleges that Bestrenogy is infringing on Cheng’s U.S. Patent No. 12,113,377, which covers a specific type of power conversion technology used in their popular WF-9855 converter charger. According to Cheng, Bestrenogy has been manufacturing, importing, using, and selling — or offering to sell — its AD-CB Battery Charger 9800 Series in the United States, and that this product incorporates technology covered by Cheng’s patent without authorization. The complaint includes images and descriptions of Bestrenogy’s product sold on Amazon.com that Cheng claims directly infringes on the patent.
Cheng further accuses Bestrenogy of willful infringement, meaning it believes the defendant knew about the patent and still proceeded with the infringing activity. In addition to patent infringement, Cheng is also bringing claims of unfair competition and false designation of origin. The company alleges that Bestrenogy’s marketing materials, including the use of certain symbols, customer service contacts, and product descriptions, could mislead consumers into believing Bestrenogy’s products are associated with or approved by Cheng.
The case has been assigned to Judge Cristal C. Brisco and Magistrate Judge Scott J. Frankel in the U.S. District Court of Northern Indiana Case No. 3:25-cv-00548.