Boring or penetrating the earth – Processes
Reexamination Certificate
2007-02-21
2009-02-03
Dang, Hoang (Department: 3672)
Boring or penetrating the earth
Processes
C175S339000, C175S371000
Reexamination Certificate
active
07484572
ABSTRACT:
A roller cone drill bit having a bit body with at least one support arm extending therefrom. Each support arm may have an interior surface and an exterior surface with an associated spindle extending inwardly from the interior surface. A respective cone assembly may be rotatably disposed on each spindle. A gap may be formed between interior portions of each cone assembly and exterior portions of the associated spindle with a fluid seal disposed in the gap to block fluid flow therethrough. Each cone assembly may include a generally circular backface disposed adjacent to the interior surface of the associated support arm. At least one fluid passageway may extend through each support arm to allow communication of fluid from the interior surface to an exterior surface of the support arm. A debris diverter insert having a generally hollow bore may be disposed within each fluid passageway.
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patent: 6264367 (2001-07-01), Slaughter, Jr. et al.
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Search Report Patent Acts 1977, Application No. GB0703383.0, 4 pages, Dated May 14, 2007.
Blackman Mark P.
Crawford Michael B.
King William W.
Pruitt Gerald L.
Rohde Bruce A.
Baker & Botts L.L.P.
Dang Hoang
Halliburton Energy Service,s Inc.
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