MAXELL, LTD. v. AMPEREX TECHNOLOGY LIMITED , No. 23-1194 (Fed. Cir. 2024)
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In a dispute between Maxell, Ltd. and Amperex Technology Limited, the United States Court of Appeals for the Federal Circuit was asked to review a decision by the United States District Court for the Western District of Texas. The case involved Maxell's U.S. Patent No. 9,077,035, which pertains to a rechargeable lithium-ion battery. Maxell had asserted that Amperex infringed upon its patent, while Amperex contested the patent's validity. The district court had deemed the claim language defining a transition metal element in the patent to be indefinite, ruling in favor of Amperex.
The Court of Appeals, however, reversed this decision. It found that the two limitations of the claims did not contradict each other. The first limitation stated that the transition metal element must contain cobalt, nickel, or manganese, while the second requirement stated that the transition metal element must contain cobalt at a content of 30% to 100% by mole. The court found it possible for a transition metal element to meet both these requirements, thus concluding that there was no contradiction. The court emphasized that all limitations of a claim must be considered to understand the invention's scope. The case was remanded for further proceedings.
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