Tag: chemical patents
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Enanta v. Pfizer: Federal Circuit Rejects Provisional Priority Based on an Alleged Typographical Error
The Federal Circuit’s decision in Enanta Pharmaceuticals, Inc. v. Pfizer Inc., Case No. 2025-1427 (Fed. Cir. June 23, 2026), holds that a later patent cannot claim the filing date of a provisional application when the provisional expressly discloses a different chemical range, even if the applicant contends that the difference resulted from a typographical error.…
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Enviro Tech v. Safe Foods: Federal Circuit Invalidates “About” pH Range Claims as Indefinite
The Federal Circuit’s decision in Enviro Tech Chemical Services, Inc. v. Safe Foods Corp., Case No. 24-2160 (Fed. Cir May 4, 2026), adds another important chapter to the growing body of indefiniteness law applying Nautilus to “terms of approximation” such as “about,” “approximately,” and “substantially.” In a precedential opinion authored by Judge Lourie, the court…