ALEXANDRIA, Va., June 16 -- United States Patent no. 12,304,029, issued on May 20, was assigned to DISCO Corp. (Tokyo).
"Grinding wheel" was invented by Masaru Nagami (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A grinding wheel is mounted on a tip end of a spindle and the grinding wheel grinds a workpiece according to rotation of the spindle. The grinding wheel includes an annular base, and a plurality of grindstone sets disposed in an annular manner on one surface side of the base along a circumferential direction of the base. Each of the plurality of grindstone sets has a first grindstone and a second grindstone having a self-sharpening capability lower than that of the first grindstone, such tha...