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:
Aug. 06, 1991
Filed:
Nov. 29, 1990
Applicant:
Inventors:
Dan B Justman, Houston, TX (US);
George A Cross, Kingwood, TX (US);
Assignee:
Smith International, Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
384 97 ; 384 95 ; 3849071 ; 175107 ;
Abstract
A bearing assembly for a downhole motor comprising a pair of annular support rings, each having a plurality of polycrystalline diamond thrust bearing inserts mounted thereon. The rings are oriented to have the respective inserts face and bear against each other. In operation, drilling mud passes through the space between the inserts to cool the inserts. The rings are made of tungsten carbide to prevent erosion of the areas at the bases of the inserts, thereby improving the life of the thrust bearings.