ALEXANDRIA, Va., June 5 -- United States Patent no. 12,275,070, issued on April 15, was assigned to MITSUBISHI HEAVY INDUSTRIES LTD. (Tokyo).
"End mill" was invented by Jun Eto (Tokyo) and Hirokazu Unno (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "The purpose of the present invention is to perform machining on a double-curved surface to have good finished surface characteristics while achieving high speed feeding. An end mill (2) is provided with a bottom blade (2A) formed in a curved convex and circular arc shape, and a radius blade (2B) located at the edge and formed in a circular arc shape. The bottom blade (2A) has a region where a blade part is not formed on the axis of the end mill (2), and th...