US Patent Issued to SUMITOMO ELECTRIC HARDMETAL on March 25 for "Diamond coated tool" (Japanese Inventors)

ALEXANDRIA, Va., March 26 -- United States Patent no. 12,257,635, issued on March 25, was assigned to SUMITOMO ELECTRIC HARDMETAL CORP. (Hyogo, Japan).

"Diamond coated tool" was invented by Rintaro Sugimoto (Hyogo, Japan), Takashi Harada (Hyogo, Japan) and Satoru Kukino (Hyogo, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A diamond coated tool includes a base material and a diamond layer provided on the base material. The diamond layer has a boron content of 1x103 ppma or more and 1x106 ppma or less and an oxygen content of 1x102 ppma or more and 1x105 ppma or less in a first region surrounded by a surface of the diamond layer and a first imaginary plane located at a distance of 1 micro metre from th...