Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate
2008-03-31
2010-11-16
Wright, Giovanna C (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
C175S425000, C175S426000
Reexamination Certificate
active
07832506
ABSTRACT:
Cutting elements offering increased toughness and thermal fatigue resistance can be formed of a wear resistant material having coarse grains disposed in a binder matrix with a binder content of at least about 18% by weight. The coarse grains include grains of at least one selected from the group of a transition metal carbide, a transition metal boride, and transition metal nitride. The binder content and coarse grain size may be selected to provide a Rockwell A hardness of at least about 75 Ra or a wear number of at least about 1.5.
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Bitler Jonathan
Liang Dah-Ben
Minikus James C.
Portwood Gary R.
Singh Amardeep
Osha • Liang LLP
Smith International Inc.
Wright Giovanna C
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