Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate
2007-12-25
2007-12-25
Mai, Lanna (Department: 3637)
Boring or penetrating the earth
Bit or bit element
Rolling cutter bit or rolling cutter bit element
C175S434000
Reexamination Certificate
active
11451885
ABSTRACT:
An earth-boring bit has a mechanical face seal assembly with PCD faces. The bit has a bearing shaft with a cone rotatably mounted on the bearing shaft. The seal locates between the bearing shaft and the cone for sealing lubricant therein. The seal includes at least one rigid seal ring having a cemented carbide body and an annular PCD face located on it. The mating face may also be of a PCD material. The cemented carbide body contains a binder that migrates into the PCD face while the PCD face is being formed. A binder-free region is leached on the surface of the PCD face.
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Article entitledSyndite PCD Wear-Resistant Parts, A. Lammer, 5 pgs.
Article entitledFriction&Wear Behaviour of Syndite PCD, K. Steinmetz, et al. 6 pgs.
Koltermann Terry
Lin Chih C.
Scott Danny E.
Baker Hughes Incorporated
Bracewell & Giuliani LLP
Mai Lanna
Smith Matthew J.
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