05135061 is referenced by 289 patents and cites 33 patents.

A preform cutting element for a rotary drill bit for use in drilling or coring holes in subsurface formations includes a cutting table 12, 13 of superhard material such as polycrystalline diamond. The rear face of the cutting table is bonded to a substrate 11 of less hard material, such as cemented tungsten carbide. A front portion 12 of the cutting table comprises a form of superhard material which is less wear-resistant than the superhard material forming the remainder 13 of the cutting table. The provision of the less wear-resistant superhard material at the front cutting faces reduces the tendency of the cutting table to spall.

Cutting elements for rotary drill bits
Application Number
Publication Number
Application Date
August 3, 1990
Publication Date
August 4, 1992
Thomas A Newton Jr
13711 Cricket Hollow, Houston, 77069
Browning Bushman Anderson & Brookhart
E21B 10/46
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