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:
Jun. 22, 2010
Filed:
Jul. 11, 2006
Takahiro Yamamoto, Toyokawa, JP;
Takahiro Yamamoto, Toyokawa, JP;
OSG Corporation, Toyokawa-shi, JP;
Abstract
A drill having a web which is provided by a central portion of a cylindrical main body of the drill and which includes a back-tapered portion and a constant-thickness portion. The cylindrical main body has a large diameter portion and a small diameter portion contiguous to the large diameter portion, such that a step is provided between the large and small diameter portions. The large diameter portion provided by the axially distal end portion of the cylindrical main body has an axial length which is larger than an axial length of the back tapered portion of the web provided by the axially distal end portion of the web, such that a boundary between the back-tapered portion and the constant-thickness portion of the web is located in the large diameter portion of the cylindrical main body.