Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate
2007-08-21
2007-08-21
Neuder, William (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
C175S425000, C175S428000
Reexamination Certificate
active
11415657
ABSTRACT:
An insert for a rock bit that includes tungsten carbide particles, and a cobalt binder disposed around the particles, wherein a grain size of the tungsten carbide particles and a content of the cobalt binder are selected to provide a fracture toughness of at least about 18 ksi (in)0.5, a wear number of at least about 2, and a hardness of 85 to 87 Ra is disclosed.
REFERENCES:
patent: 7036614 (2006-05-01), Liang et al.
patent: 7048080 (2006-05-01), Griffo et al.
patent: 2004/0140133 (2004-07-01), Liang
Griffo Anthony
Liang Dah-Ben
Neuder William
Smith International Inc.
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