ALEXANDRIA, Va., June 6 -- United States Patent no. 12,281,366, issued on April 22, 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 includes the following steps: A. the provision of a steel sheet for heat treatment, precoated with a zinc- or aluminum-based pre-coating for anti-corrosion purpose, B. the deposition of a hydrogen barrier pre-coating over a thickness from 10 to 550 nm, C. the batch annealing of the precoated...