ALEXANDRIA, Va., June 4 -- United States Patent no. 12,318,846, issued on June 3, was assigned to SUMITOMO ELECTRIC HARDMETAL CORP. (Hyogo, Japan).
"Diamond tool" was invented by Takashi Harada (Hyogo, Japan), Satoru Kukino (Hyogo, Japan) and Naoki Watanobe (Hyogo, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A diamond tool includes a diamond at least on a cutting edge includes a diamond phase composed of a diamond crystal structure and a graphite phase composed of a graphite crystal structure. When a ratio IPi*/ISigma* between an intensity of a Pi* peak derived from a Pi bond of carbon in the graphite phase and an intensity of a Sigma* peak derived from a Sigma bond of carbon in the graphite phase a...