ALEXANDRIA, Va., April 15 -- United States Patent no. 12,599,977, issued on April 14, was assigned to MOLDINO Tool Engineering Ltd. (Tokyo).
"End mill" was invented by Makoto Baba (Yasu, Japan) and Takafumi Sai (Yasu, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "An end mill includes: at a distal end portion side in a rotation axis direction of a tool body, a plurality of cutting edges continuous from a center side to an outer peripheral side in a radial direction and adjacently arranged in a rotation direction of the tool body; gashes formed on front sides in a rotation direction of the respective cutting edges; and chip discharge flutes continuous with the gashes. The gashes are composed of distal e...