Cutting elements for rotary drill bits
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United States of America Patent
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Feb 26, 1991
Grant Date -
N/A
app pub date -
Apr 4, 1989
filing date -
Apr 5, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A cutting element for a rotary drill bit comprises a layer of polycrystalline diamond material having a front face and a rear face, a backing layer of less hard material bonded to the rear face of the diamond layer, and a front layer of less hard material bonded to the front face of the diamond layer and extending across at least the major part thereof. The front layer is thinner than the backing layer, at least in the vicinity of the cutting edge of the cutting element.
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