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. 29, 2009
Filed:
Mar. 25, 2008
Applicants:
Ulrich F Krenzer, Zirndorf, DE;
Herbert Kauper, Nürnberg, DE;
Inventors:
Ulrich F Krenzer, Zirndorf, DE;
Herbert Kauper, Nürnberg, DE;
Assignee:
Kennametal Inc., Latrobe, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23B 51/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
Disclosed is a drilling tool comprising a first drill bit () that is provided with at least two forward cutting edges () and a second drill bit () which encompasses at least two rear cutting edges (). A cutting groove () runs continuously from one respective forward cutting edge () to a rear cutting edge (). Said cutting groove () is embodied in an asymmetric manner in an area (A) bordering the forward drill bit (), in a symmetric manner in a central area (B), and asymmetric in an area (C) bordering the rear drill bit ().