Recent decisions across the Federal Circuit and district courts reflect a tightening approach to approximation in patent claims. In Enviro Tech Chemical Services, Inc. v. Safe Foods Corp., the Federal Circuit invalidated claims where “about” lacked objective boundaries. Enviro Tech Chem. Servs., Inc. v. Safe Foods Corp., No. 2024-2160, 2026 WL 1204374 (Fed. Cir. May
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