Boring or penetrating the earth – Cutter element laterally shiftable below ground
Reexamination Certificate
2006-12-05
2006-12-05
Bagnell, David (Department: 3672)
Boring or penetrating the earth
Cutter element laterally shiftable below ground
C175S284000, C175S383000
Reexamination Certificate
active
07143847
ABSTRACT:
Drilling apparatus, such as an underreamer (20) comprises a generally cylindrical tubular body (22) and two cutting blades (26, 27) pivotally mounted to the body and movable between a retracted position and an extended position. Each cutting blade has a retracted position minimum gauge cutting portion (36) and an extended position maximum gauge cutting portion (35), with the blades in the extended position the gauge cutting portions (35) extending axially and being located in a transverse plane on or forward of the blade pivot axis.
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Bagnell David
Patterson & Sheridan LLP
Stephenson Daniel P
Weatherford / Lamb, Inc.
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