Cutting elements for rotary drill bits
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United States of America Patent
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-
May 29, 1990
Issued Date -
N/A
app pub date -
Nov 5, 1987
filing date -
Dec 22, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A cutting element, for a rotary drill bit, comprises a tablet having a front face, a rear face and a peripheral edge, at least the front face of the tablet being provided by a layer of superhard material, such as polycrystalline diamond. The peripheral edge of the tablet is formed with one or more re-entrant portions so as to define projecting cutting portions to the sides of the re-entrant portions. The element may be cut from a blank which is initially circular.
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