Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate
2008-04-01
2008-04-01
Neuder, William P (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
C175S425000
Reexamination Certificate
active
07350600
ABSTRACT:
An earth-boring bit has a bit body that includes head sections, each having depending bit legs with a circumferentially extending outer surface, a leading side, and a trailing side. A bearing shaft depends inwardly from each of the bit legs for mounting a cutter. The bit includes a beveled surface formed at a junction of the leading side and the outer surface of each bit leg. The beveled surface is angled relative to a radial plane emenating from the axis of the bit. The angle of the beveled surface is at least 20 degrees, and extends to an inner surface of the bit leg. The bit can also have a layer of hardfacing on the leading, trailing and shirttail surfaces of the bit leg. A diversion finger of hardfacing extends circumferentially to direct cuttings.
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Beuershausen, D., 1 page drawings OD Hardfacing (Mar. 13, 2003), and was sold in May 2003.
Beuershausen Christopher C.
Hales Ronald
Jones Ronald L.
Koltermann Terry J.
Lema Raul E.
Baker Hughes Incorporated
Bracewell & Giuliani LLP
Neuder William P
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