06189634 is referenced by 40 patents and cites 26 patents.

A cutting element, insert or compact, is provided for use with drills used in the drilling and boring of subterranean formations. This new insert, in its preferred embodiment, has a “hoop” region of polycrystalline diamond extending around the periphery of the compact to reduce the residual stresses inherent in thick diamond regions of cutters. This compact has improved wear and durability characteristics because it avoids failures due to stresses, delaminations and fractures caused by the differences in thermal expansion coefficient between the diamond and the substrate during sintering. Moreover, this invention may provide multiple polycrystalline diamond edges as the PDC wears. This exposure of multiple polycrystalline diamond edges slows the rate of wear flat surface development and reduces the weight on the bit required for acceptable drill penetration rates.

Title
Polycrystalline diamond compact cutter having a stress mitigating hoop at the periphery
Application Number
9/157074
Publication Number
6189634 (B1)
Application Date
September 18, 1998
Publication Date
February 20, 2001
Inventor
Kenneth M Jensen
Springville
UT, US
Kenneth E Bertagnolli
Sandy
UT, US
Agent
Lloyd W Sadler
US
Assignee
U S Synthetic Corporation
UT, US
IPC
E21B 10/36
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