Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate
2008-08-14
2010-11-02
Wright, Giovanna C (Department: 3672)
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
C175S425000
Reexamination Certificate
active
07823664
ABSTRACT:
An earth boring bit has a steel body having at least one leg with a depending bearing pin. A cone having cutting elements is rotatably mounted to the bearing pin. A ball plug weld is on the outer surface of the leg. A layer of hardfacing applied to part of the outer surface of the leg, the hardfacing having carbide particles in a matrix. A corrosion resistant coating containing at least 50% nickel is formed on parts of the outer surface of the leg that are free of the layer of hardfacing both above and below the ball plug weld.
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Bradford, III John F.
El Hakam Carmel Z.
Kulkarni Ajay V.
Luce David K.
Massey Alan J.
Baker Hughes Incorporated
Bracewell & Giuliani LLP
Wright Giovanna C
LandOfFree
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