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:
Mar. 28, 2000
Filed:
Dec. 05, 1997
Applicant:
Inventors:
Ghanshyam Rai, The Woodlands, TX (US);
Ronald K Eyre, Orem, UT (US);
Nathan R Anderson, Pleasant Grove, UT (US);
Assignee:
Smith International, Inc., Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
175432 ; 175428 ; 175426 ;
Abstract
This invention is directed to cutting elements having an ultra hard cutting layer such as polycrystalline diamond or polycrystalline cubic boron nitride bonded on a cemented carbide substrate. The interface between the substrate and the cutting layer of each such cutting element is non-planar. The non-planar interface is designed to enhance the operating life of the cutting element by reducing chipping, spalling, partial fracturing, cracking and/or exfoliation of the ultra hard cutting layer, and by reducing the risk of delamination of the cutting layer from the substrate.