US Patent Issued to SUBARU on Sept. 15 for "Drill and method of producing drilled product" (Japanese Inventors)

ALEXANDRIA, Va., Sept. 15 -- United States Patent no. 12,734,591, issued on Sept. 15, was assigned to SUBARU Corp. (Tokyo).

"Drill and method of producing drilled product" was invented by Rei Nakamoto (Tokyo), Tsukasa Yokono (Tokyo), Aoi Mase (Tokyo) and Shunsuke Saito (Tokyo).

According to the abstract* released by the U.S. Patent & Trademark Office: "A drill has two to four cutting edges each made of cemented carbide or polycrystalline diamond. Helical flutes are formed alternately with the cutting edges. X-shaped thinning has been applied to the cutting edges. A rake angle of the cutting edges is not less than 30 degrees and not more than 40 degrees. A clearance angle of the cutting edges is more than 0 degrees and not more than 8 degr...