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:
Jul. 22, 2003
Filed:
Jun. 09, 2000
Applicant:
Inventors:
Curnie A. Dunn, Bristol, VA (US);
Phillip W. Haga, Chilhowie, VA (US);
Ted R. Massa, Latrobe, PA (US);
Douglas E. Bise, Chilhowie, VA (US);
Gary J. Condon, Irwin, PA (US);
Stephen T. Belsheim, Kingston Springs, TN (US);
James E. Rutherford, Big Stone Gap, VA (US);
Assignee:
Kennametal Inc., Latrobe, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B 1/038 ; E21B 1/058 ;
U.S. Cl.
CPC ...
E21B 1/038 ; E21B 1/058 ;
Abstract
A rotary drill bit for penetrating earth strata wherein the drill bit includes a drill bit body that has an axial forward end. The drill bit body has a hard insert, which is preferably monolithic, that is affixed to the drill bit body at the axial forward end thereof. The hard insert presents at least three discrete leading cutting edges for cutting the earth strata.