ALEXANDRIA, Va., Oct. 21 -- United States Patent no. 12,766,613, issued on Oct. 20, was assigned to OSG Corp. (Toyokawa, Japan).
"Ball end mill and cutting insert" was invented by Yasuhito Fujii (Toyokawa-City, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "Large diameter edges formed in arc shapes having curvature radii larger than a ball radius are provided. This allows improving surface roughness of a machined surface by cutting of a planar surface with the respective large diameter edges compared with cutting of a planar surface with a ball end cutting edge formed in an arc shape having a single curvature radius. Further, since the respective large diameter edges are formed in the arc shape, compar...