Boring or penetrating the earth – With orienting or racking means for unconnected tools or...
Reexamination Certificate
2005-07-05
2005-07-05
Neuder, William (Department: 3672)
Boring or penetrating the earth
With orienting or racking means for unconnected tools or...
C166S077510
Reexamination Certificate
active
06913096
ABSTRACT:
A top drive well drilling apparatus includes a body with means for suspending the body from a drilling rig. A motor is secured to the body. The motor has a central passage defining a rotational axis. The central passage is adapted to receive a tubular drive shaft. A pipe gripping assembly is provided which underlies and is in axial alignment with the central passage. The pipe gripping assembly rotates independent of the motor for purposes of orientation.
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Dobrijevic Sinisa
Nielsen Shawn James
Davis & Bujold P.L.L.C.
Neuder William
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