Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate
2006-03-10
2010-06-22
Stephenson, Daniel P (Department: 3676)
Boring or penetrating the earth
Bit or bit element
Specific or diverse material
C175S426000
Reexamination Certificate
active
07740090
ABSTRACT:
A cutter having a base portion, an ultrahard layer disposed on the base portion, and at least one relief groove formed on an outer surface of the cutter. The at least one relief groove is configured to form a relief gap between the ultrahard layer and an inside surface of a cutter pocket.
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Shen Yuelin
Zhang John (Youhe)
Smith International Inc.
Stephenson Daniel P
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