ALEXANDRIA, Va., Dec. 31 -- United States Patent no. 12,508,661, issued on Dec. 30, was assigned to Sumitomo Electric Hardmetal Corp. (Itami, Japan) and Toyota Jidosha K.K. (Toyota, Japan).
"Drill" was invented by Masashi Yamada (Itami, Japan), Naoyuki Wakatsuki (Toyota, Japan), Yasumasa Sunano (Toyota, Japan), Takayuki Natori (Toyota, Japan) and Riku Tadokoro (Toyota, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "The outer peripheral surface is provided with a first margin contiguous to each of the cutting edge and the flank face, and a second margin that is located on the rear side with respect to the first margin in a rotation direction and that is separated from each of the flank face and the thin...