ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,448,664, issued on Oct. 21, was assigned to ArcelorMittal (Luxembourg).
"Press hardening method" was invented by Raisa Grigorieva (Metz, France), Florin Duminica (Tilff, Belgium), Brahim Nabi (Leuven, Belgium), Pascal Drillet (Rozerieulles, France) and Thierry Sturel (Le Ban Saint Martin, France).
According to the abstract* released by the U.S. Patent & Trademark Office: "A press hardening method including the following steps: A. the provision of a steel sheet for heat treatment being optionally coated with a zinc- or aluminum-based pre-coating, B. the flexible rolling of the steel sheet in the rolling direction so as to obtain a steel sheet having a variable thickness, C. the cuttin...