ALEXANDRIA, Va., April 2 -- United States Patent no. 12,264,378, issued on April 1, was assigned to JFE Steel Corp. (Tokyo).
"High strength steel sheet and method for manufacturing the same" was invented by Kazuki Endoh (Tokyo), Yoshiyasu Kawasaki (Tokyo) and Yuki Toji (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "Provided is a high strength steel sheet that has a predetermined chemical composition and is manufactured under optimum conditions, the high strength steel sheet having a steel microstructure including, by area, ferrite: 30% or more and 80% or less, tempered martensite: 3.0% or more and 35% or less, and retained austenite: 8% or more, wherein the quotient of the area fraction of grains of t...