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:
Oct. 10, 1995
Filed:
Feb. 16, 1994
Applicant:
Inventors:
Thomas M Dennis, Houston, TX (US);
Mark Hunt, Houston, TX (US);
Assignee:
Dennis Tool Company, Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
1754202 ; 299100 ; 175431 ;
Abstract
An improved bifurcated drill bit is set forth. It has a shank for connection with a chuck, a cylindrical head having an outer face, and duplicate cutter faces. Each cutter is formed of PDC inserts which are cylindrical (or segments thereof). The PDC inserts are formed from a circular disk or ring which has an alignment hole in the center. When mounted, the insert presents a PDC face which bears against the drill hole. The drill hole is formed by cutting action of the inserts. Impact and shock loading occurs at the PDC surface.