ALEXANDRIA, Va., July 28 -- United States Patent no. 12,691,523, issued on July 28, was assigned to DISCO Corp. (Tokyo).
"Processing method and processing apparatus for workpiece" was invented by Keiichiro Niitsu (Tokyo), Youngsuk Kim (Tokyo) and Koji Watanabe (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed is a processing method for a workpiece. The processing method includes a holding step of holding the workpiece on a holding table, a grinding step of grinding the workpiece that is held on the holding table at and around its center by a grinding wheel, so that a recess portion is formed at and around the center of the workpiece and an annular projection portion is formed surrounding the re...