Innoscience Wins Preliminary Injunction Support in Patent Infringement Lawsuit Against Infineon

On June 12, 2026, the Supreme People's Court of China issued a ruling dismissing Infineon Technologies AG’s (“Infineon”) reconsideration application, thereby upholding the preliminary injunction previously granted by the Suzhou Intermediate People's Court of Jiangsu Province. This decision means that Infineon's multiple gallium nitride (GaN) power semiconductor products are immediately subject to a comprehensive halt of sales, offers for sale, and imports within the territory of China.

Innoscience (Suzhou) Technology Co., Ltd. (“Innoscience”) is a Chinese enterprise specializing in the R&D and manufacturing of third-generation semiconductor gallium nitride chips. Operating under an IDM model (integrating design, manufacturing, packaging and testing), Innoscience ranks first globally in shipment volume among GaN power semiconductor companies, with a market share of 42.4%. Infineon, headquartered in Germany, is a global semiconductor leader in power systems and the Internet of Things, with an extensive business portfolio.

Previously, Infineon had initiated lawsuits in Germany and the United States. In August 2025, the Munich District Court in Germany ruled that Innoscience had infringed Infineon's patents and prohibited the sale of relevant GaN products in Germany. In the same year, Infineon also filed a Section 337 complaint with the U.S. International Trade Commission (ITC) in an attempt to block Innoscience's products from entering the U.S. market.

In response to the overseas encirclement, Innoscience chose to shift the main battlefield back to China. On January 16, 2025, Innoscience filed a lawsuit with the Suzhou Intermediate People's Court, accusing Infineon Technologies (China) Co., Ltd. and Infineon Technologies (Wuxi) Co., Ltd., among others, of infringing two of its core invention patents related to gallium nitride, and sought injunctive relief and damages.

Infineon subsequently filed invalidation challenges against Innoscience's two patents before the China National Intellectual Property Administration (CNIPA). On November 19, 2025, the CNIPA issued invalidation examination decisions, maintaining the patent entitled “Nitride-based semiconductor device and method for manufacturing the same” (CN115663025B) as partially valid, and the patent entitled “GaN power device and preparation method thereof” (CN117476762B) as entirely valid. Infineon then filed an administrative lawsuit against these decisions with the Beijing Intellectual Property Court.

On April 24, 2026, the Beijing Intellectual Property Court rendered its first-instance judgment, fully upholding the validity of both Innoscience patents, finding that they meet the requirements of novelty, inventiveness, and practical applicability under the Chinese Patent Law. In its judgment, the court specifically noted that Innoscience's GaN device structural design and manufacturing processes represent significant technological advances and do not constitute prior art.

With the patent validity confirmed by judicial decision, the Suzhou Intermediate Court accelerated the infringement proceedings. On May 27, 2026, the court issued its first-instance judgment, finding that Infineon had infringed both of Innoscience's invention patents, with the infringing products covering multiple GaN power devices, including Infineon's CoolGaN™ series. The court ordered Infineon to immediately cease the sale, offering for sale, and import of the relevant infringing products, and awarded Innoscience a total of RMB 10 million in economic damages.

It is noteworthy that this preliminary injunction (which under Chinese procedural law constitutes a behavioral preservation measure) is legally effective immediately and is not stayed pending the final appellate judgment. This means that, as of May 27, Infineon's relevant products are no longer permitted to be sold in China.

Infineon, dissatisfied with the first-instance injunction ruling, applied to the Supreme People's Court for reconsideration in an attempt to overturn or stay the injunction. However, on June 12, 2026, the Supreme People's Court issued its formal reconsideration ruling on the preliminary injunction, rejecting all of Infineon's reconsideration requests and upholding the Suzhou Intermediate Court's injunction order. China Intellectual Property Law Network will continue to follow the subsequent developments.