ALEXANDRIA, Va., Aug. 26 -- United States Patent no. 12,398,452, issued on Aug. 26, was assigned to DARWIN PRECISIONS Corp. (Hsinchu County, Taiwan).
"Metal mask" was invented by Yun-Heng Chen (Hsinchu County, Taiwan) and Wen-Yi Lin (Hsinchu County, Taiwan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method of manufacturing a metal mask includes calendering a metal material, so as to form a metal mask substrate, where the metal mask substrate includes a surface and a plurality of grooves formed in the surface, and the grooves all extend in a direction. The surface has at least one sampling region, while at least two grooves are distributed in the sampling region, where an average area ratio of the area o...