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Federal Circuit Finds that a Narrowing Claim Limitation that Expressly Requires Optional Elements of a Markush Group from the Same Claim is Neither Contradictory Nor Indefinite

June 12, 2024

In Maxell, Ltd. v. Amperex Technology Limited, 2023-1194 (Fed. Cir. Mar. 6, 2024), the Federal Circuit reaffirms that a patent claim that includes narrowing limitations requiring only some elements of a Markush group recited in the same claim are not indefinite under Section 112 so long as the claim, when read as a whole, is internally consistent and supported by the specification….
By: Sheppard Mullin Richter & Hampton LLP

Federal Circuit Finds that a Narrowing Claim Limitation that Expressly Requires Optional Elements of a Markush Group from the Same Claim is Neither Contradictory Nor Indefinite

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