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:
Nov. 01, 2011
Filed:
Aug. 09, 2007
Applicants:
Takuma Nonaka, Tokyo, JP;
Naohide Murakami, Tokyo, JP;
Kazuhisa Morita, Oshu, JP;
Inventors:
Assignee:
Max Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B24D 7/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
A non-core drill bit is provided with a metallic seatattached to the tip of a shank of a boring tool, a cylindrical first diamond grindstone bodyfixed to the metallic seatand having a recessed cutout portionto be opened to one side, and a second diamond grindstone bodyinstalled inside the recessed cutout portion. The tip of the second diamond grindstone bodyis positioned on the metallic seatside from the tip of the first diamond grindstone body. The inner side of the tip face of the first diamond grindstone bodyis preferably formed in an approximately reverse-conical recessed shape.