Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Reexamination Certificate
2011-08-16
2011-08-16
Stephenson, Daniel P (Department: 3676)
Boring or penetrating the earth
With tool shaft detail
Axially telescoping shaft section
C267S125000
Reexamination Certificate
active
07997357
ABSTRACT:
A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define a first and a second chamber for holding the fluid. Fluid can flow between the first and second chambers in response to the movement of the second member in relation to the first member. The valve assembly can also include a coil or a valve for varying a resistance of the fluid to flow between the first and second chambers.
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Burgess Daniel E.
Perry Carl Allison
Turner William Evans
Wassell Mark Ellsworth
APS Technology, Inc.
Stephenson Daniel P
Woodcock & Washburn LLP
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