ALEXANDRIA, Va., April 2 -- United States Patent no. 12,263,513, issued on April 1, was assigned to Proterial Ltd. (Tokyo).
"Coated die for use in hot stamping" was invented by Tatsuya Shouji (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A coated die for use in hot stamping has a hard film having an alternating lamination section formed by alternating lamination of a1 layers consisting of nitride having 30% or more of chromium in atomic ratio in a metal part, and a2 layers consisting of nitride having 50% or more of vanadium in atomic ratio in a metal part. When ta1 and ta2 are defined as thicknesses of the a1 layer and the a2 layer respectively, a film thickness ratio Xb is defined as a film thickne...