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:
Mar. 17, 2020
Filed:
Jun. 22, 2017
Applicant:
Toko Co., Ltd., Bunkyo-Ku, Tokyo, JP;
Inventor:
Makoto Terashima, Tokyo, JP;
Assignee:
Toko Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
B23B 51/02 (2006.01); A61B 17/16 (2006.01);
U.S. Cl.
CPC ...
B23B 51/02 (2013.01); A61B 17/16 (2013.01); B23B 2251/04 (2013.01); B23B 2251/18 (2013.01); Y10T 408/9097 (2015.01);
Abstract
A drill includes a tip cutting edge provided at a tip end thereof and a main cutting edge continuous to a rearward of the tip cutting edge. A point angle of the tip cutting edge is a predetermined acute angle. A point angle of the main cutting edge decreases from a front end toward a rear end of the main cutting edge. A point angle at the front end of the main cutting edge is an acute angle greater than the point angle of the tip cutting edge.