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. 23, 2009
Filed:
Apr. 25, 2007
Applicants:
Klaus Hoeggerl, Finning, DE;
Olaf Koch, Kaufering, DE;
Thorsten Assel, Landsberg, DE;
Inventors:
Assignee:
Hilti Aktiengesellschaft, Schaan, LI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 10/36 (2006.01);
U.S. Cl.
CPC ...
Abstract
A hard material bit for a rotary-percussion tool () includes at least one cutting edge (), a bottom surface () located opposite the at least one cutting edge (), and at least one attachment surface () and at least one free surface () both extending transverse to the bottom surface () and forming, respectively, a piecewise extending first chamfer () and second chamfer (), with the second chamfer () having a width greater than a width of the first chamfer ().