Boring or penetrating the earth – With tool shaft detail
Reexamination Certificate
2006-08-22
2006-08-22
Dang, Hoang (Department: 3672)
Boring or penetrating the earth
With tool shaft detail
C166S065100, C340S854400
Reexamination Certificate
active
07093680
ABSTRACT:
An insulator for a subsurface signal transmitting apparatus. The insulator includes a housing, a mandrel axially disposed inside the housing, a first insulating material disposed between the housing and the mandrel, a first sleeve formed of a second insulating material disposed between the housing and a first tubular member and the first tubular member coupled to the mandrel.
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Haslett James W.
Holbert Marvin L.
Smallwood Robert E.
Trofimenkoff Frederick N.
Dang Hoang
Patterson & Sheridan L.L.P.
Weatherford / Lamb, Inc.
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