US Patent Issued to OSG on Sept. 8 for "Drill" (Japanese Inventor)

ALEXANDRIA, Va., Sept. 8 -- United States Patent no. 12,728,467, issued on Sept. 8, was assigned to OSG Corp. (Toyokawa, Japan).

"Drill" was invented by Takahiro Yamamoto (Toyokawa, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "A drill is provided with a flank at a leading end portion of a body. An oil hole is provided at the flank, having a fan-shaped cross-section. The fan-shaped cross-section is formed by being surrounded by a front-side inner wall surface, a rear-side inner wall surface, an outer peripheral-side inner wall surface, and an inner peripheral-side inner wall surface. Compared to a round hole, a discharge performance of cutting fluid of the oil hole is high. The rear-side inner wall su...