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. 30, 1999
Filed:
Sep. 18, 1996
Nigel D Griffin, Whitminster, GB;
Camco Drilling Group Ltd., Stonehouse, Gloucestershire, GB;
Abstract
A preform element includes a polycrystalline facing table having a front face, a peripheral surface, and a rear surface bonded to the front surface of a tungsten carbide substrate. The front surface of the substrate has a flat central region and an outer peripheral region which is inclined away from the front face of the facing table as it extends outwardly. The outer peripheral region is formed with a number of spaced semi-circular recesses into which extend projections of diamond material formed on the rear surface of the facing table. The outer edge of each recess lies on the periphery of the substrate and the curved inner edge is tangential to the central region of the substrate. Smaller recesses are formed in the bottom surfaces of the semi-circular recesses and at other locations over the front surface of the substrate.