On 7 May 2026, the ITC issued a partial final ruling in the Section 337 case brought by Infineon against the Chinese gallium nitride semiconductor firm Innoscience, finding that Innoscience had infringed Infineon’s US Patent No. 9,899,481. Consequently, the ITC issued a limited exclusion order and a cease-and-desist order prohibiting the importation of Innoscience’s infringing products into the United States.

Previously, on 2 February 2026, the ITC decided to review the Administrative Law Judge’s preliminary determination of 3 December 2025, requesting further submissions from the parties. On 7 May 2026, the ITC Commission found that Innosea had infringed claims 4 and 17 of Infineon’s US Patent No. 9,899,481, but had not infringed US Patent No. 9,070,755, and issued a limited exclusion order and cease-and-desist order. The order is subject to a 60-day review period by the US President before it takes effect.

In addition to the ITC proceedings, Infineon has filed infringement lawsuits in the US District Court for the Northern District of California and the First Regional Court in Munich, Germany, with the German court having already issued a unilateral preliminary injunction against Innosea. Innosea has sued Infineon in the Suzhou Intermediate People’s Court in China for infringement of its own gallium nitride patents; Infineon attempted to have the case transferred to another court, but this application was rejected by the Supreme People’s Court.

Background to the Case

On 14 March 2024, Infineon filed a patent infringement lawsuit against Innosea, its US subsidiaries and affiliates in the US District Court for the Northern District of California, alleging infringement of a core patent (US 9,899,481) relating to GaN power semiconductor devices;

On 12 June 2024, the Munich Regional Court in Germany issued a preliminary injunction prohibiting Innosea from displaying the allegedly infringing products at the PCIM Europe exhibition;

On 23 July 2024, Infineon expanded the scope of the litigation, adding three further allegations of patent infringement relating to gallium nitride: US 8,686,562, US 9,070,755 and US 8,264,003;

On 26 July 2024, Infineon filed a Section 337 investigation with the US International Trade Commission (ITC), seeking an injunction to prohibit the import and sale of the infringing products;

On 1 August 2025, a German court ruled that certain Innosilicon products infringed patents, prohibiting their sale on the German market and ordering the payment of damages;

In January 2025, Innosec filed a counterclaim for patent infringement against Infineon Technologies (China) Co., Ltd. and its affiliated companies at the Suzhou Intermediate People’s Court; Infineon appealed to the Supreme People’s Court, but the appeal was dismissed on 11 May of the same year.

On 19 November 2025, the China National Intellectual Property Administration rejected Infineon’s request for a declaration of invalidity, ruling that the two patents in question held by Innosec (202211387983.X and 202311774650.7) were valid;

On 3 December 2025, the ITC issued a preliminary determination in patent infringement case No. 337-TA-1414 between Infineon and Innosea;

On 2 February 2026, the ITC Commission decided to review certain findings of infringement and requested that the parties submit their comments;

On 7 May 2026, the ITC issued its final ruling, imposing a limited exclusion order and an injunction.

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