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:
Dec. 30, 1986
Filed:
May. 25, 1984
Applicant:
Inventor:
Mahlon Dennis, Kingwood, TX (US);
Assignee:
Strata Bit Corporation, Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175329 ; 175410 ;
Abstract
A drill bit for connection on a drill string has a hollow tubular body with an end cutting face and an exterior peripheral stabilizer surface with cylindrical sintered carbide inserts positioned in recesses therein having polycrystalline diamond cutting elements mounted on said inserts. The inserts each also have a metal reinforcing shroud secured on the supporting face providing a reinforcement for the polycrystalline diamond cutting elements which is not subject to notch fracture. Each shroud is arranged so that a wall of the associated recess reinforces the shroud against shear forces and reinforces the stud against fracture.