The U.S. Court of Appeals for the Federal Circuit (CAFC) issued a precedential opinion on Monday that reversed and vacated in part a previous lower court ruling in a patent case related to fuel tank sensors. In 2020, SSI Technologies filed a lawsuit against Dongguan Zhengyang Electronic Mechanical LTD (DZEM), alleging infringement of two patents that covered fuel tank sensor technology. SSI accused DZEM of producing systems to reduce emissions for diesel truck engines that infringed U.S. Patent Nos. 8,733,153 and 9,535,038. In September 2021, a Wisconsin district court dismissed the patent infringement claims by SSI, as well as DZEM’s counterclaims that the patents were invalid.
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