ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,747,505, issued on Sept. 29, was assigned to NIPPON STEEL Corp. (Tokyo).
"Surface-treated metal sheet" was invented by Hiromasa Shoji (Tokyo), Kohei Ueda (Tokyo), Satoru Yonetani (Tokyo), Tomokazu Sugitani (Tokyo) and Nobuki Shiragaki (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A surface-treated metal sheet includes a steel sheet, a coating layer containing zinc formed on the steel sheet and a conversion coating formed on the coating layer, wherein the conversion coating contains an organosilicon compound, a phosphate compound and a fluorine compound, and when the surface roughness in a rectangular area with a side of 1 micro metre on the sur...