Mining or in situ disintegration of hard material – Cutter tooth or tooth head – Rolling or rotatable bit
Reexamination Certificate
2011-05-24
2011-05-24
Kreck, John (Department: 3672)
Mining or in situ disintegration of hard material
Cutter tooth or tooth head
Rolling or rotatable bit
C299S113000, C299S107000
Reexamination Certificate
active
07946656
ABSTRACT:
A retention assembly, comprises a carbide bolster comprising a cavity formed in its base end. A shaft comprises an inserted end disposed within the cavity. The shaft is disposed within a hollow shank which comprises a first end contacting the bolster and a loaded end in mechanical communication with the shaft. Wherein, the inserted end is brazed to an inner surface of the cavity.
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Dahlgren Scott
Durrand Christopher
Elqueta Italo
Hall David R.
Marshall Jonathan
Holme Roberts & Owen LLP
Kreck John
Schlumberger Technology Corporation
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