The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 15, 2026
Filed:
Feb. 01, 2024
Applicant:
Subaru Corporation, Tokyo, JP;
Inventors:
Assignee:
SUBARU CORPORATION, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
B23B 51/02 (2006.01); B23B 51/06 (2006.01);
U.S. Cl.
CPC ...
B23B 51/02 (2013.01); B23B 51/0684 (2022.01); B23B 2251/048 (2022.01);
Abstract
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 degrees. The cutting edges each has a honed face by chamfer honing. A honing angle of the honed face is not less than −3 degrees and not more than 8 degrees.