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. 03, 2009
Filed:
Jun. 09, 2005
Applicants:
Rainer Batliner, Schaanwald, LI;
Olaf Koch, Hurlach, DE;
Karl-heinz Hofmann, Weil, DE;
Werner Britten, Saarbruecken, DE;
Inventors:
Rainer Batliner, Schaanwald, LI;
Olaf Koch, Hurlach, DE;
Karl-Heinz Hofmann, Weil, DE;
Werner Britten, Saarbruecken, DE;
Assignee:
Hilti Aktiengesellschaft, Schaan, LI;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 10/40 (2006.01);
U.S. Cl.
CPC ...
Abstract
A drill bit for a hammer drill for drilling in stone, concrete and the like includes a drill bit head formed as a hard material body with radial legs and having at least three radially extending cutting bits formed on the radial legs, and a centering tip in a center of the hard material body and projecting beyond one of the cutting bits, with the centering tip having concave limiting surfaces stretching between the linearly extending auxiliary cutting edges.