US Patent Issued to SUMITOMO ELECTRIC HARDMETAL on July 8 for "Drill" (Japanese Inventors)

ALEXANDRIA, Va., July 9 -- United States Patent no. 12,350,744, issued on July 8, was assigned to SUMITOMO ELECTRIC HARDMETAL CORP. (Hyogo, Japan).

"Drill" was invented by Mayuka Segawa (Hyogo, Japan), Machiko Abe (Hyogo, Japan), Akihiko Ueda (Hyogo, Japan), Yoshinori Tanigawa (Hyogo, Japan) and Takashi Harada (Hyogo, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A drill includes a blade tip part that is formed of diamond and a trunk part that is formed of diamond and is continuous with the blade tip part, the drill rotating about a drill axis, the blade tip part includes N cutting edges where N is an integer of no less than 4, and a proportion of S1 to S2 is no less than 30% and no more than 60%, whe...