On August 19, 2025, the U.S. Court of Appeals for the Federal Circuit issued an opinion affirming the U.S. District Court for the Eastern District of Louisiana’s grant of summary judgment that claims of Wilco Marsh Buggies & Draglines, Inc.’s (“Wilco”) amphibious vehicle patent are invalid as anticipated. Wilco Marsh Buggies & Draglines, Inc. v. Weeks Marine, Inc. , C.A. No. 2023-2320 (Fed. Cir. Aug. 19, 2025).

In the district court, Wilco sued Weeks Marine, Inc. (“Weeks”) for patent infringement, asserting that Weeks’ amphibious excavators infringed several claims of U.S. Patent No. 6,918,801. Weeks moved for summary judgment of invalidity, arguing that the asserted claims were anticipated through “public use” and by “sales” of the MudMaster, a prior art machine manufactured by DredgeM

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