ALEXANDRIA, Va., April 21 -- United States Patent no. 12,605,773, issued on April 21, was assigned to SUMITOMO ELECTRIC HARDMETAL CORP. (Itami, Japan).
"Drill and cutting method" was invented by Yusuke Makiuchi (Itami, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A drill includes a flank face, a rake face, and a main cutting edge on a ridgeline between the rake face and the flank face. The main cutting edge has a first curved portion having a curved shape contiguous with the flank face and a second curved portion having a curved shape contiguous with the rake face in a sectional view orthogonal to an extending direction of the main cutting edge. A first curvature radius of the first curved portion is...