ALEXANDRIA, Va., Sept. 24 -- United States Patent no. 12,742,236, issued on Sept. 22.

"Surface pre-oxidized AlCrVTiSiON nano-gradient coating and preparation method thereof" was invented by Tiegang Wang (Tianjin City, China), Rui Zhang (Tianjin City, China), Mengjiao Xu (Tianjin City, China), Yanmei Liu (Tianjin City, China) and Bing Yan (Tianjin City, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "The invention discloses an AlCrVTiSiON nano-gradient coating with surface pre-oxidation and a preparation method thereof, belonging to the technical field of coatings. The AlCrVTiSiON nano gradient coating is prepared by arc ion plating technology, wherein the target materials are selected from metal Cr targ...