Boring or penetrating the earth – Processes
Reexamination Certificate
2007-08-07
2007-08-07
Tsay, Frank (Department: 3672)
Boring or penetrating the earth
Processes
C175S423000
Reexamination Certificate
active
10483013
ABSTRACT:
A slips assembly which comprises a plurality of slip segments which, when positioned adjacent to each other, form a collar, which collar is larger than the diameter of the tubular body of the tubular at the top of the drill string and smaller than the diameter the upset shoulder of the said tubular, there being a segment moving means which can move the segments together to from a collar slidably located around the body of the said tubular, which slips assemblies can also be utilised in conjunction with, or as part of, the couplers referred to in prior patent applications, either to support, raise or lower the string below, or restraint, lower or raise the tubular, or stand of tubulars, above.
REFERENCES:
patent: 3722603 (1973-03-01), Brown
patent: 3748702 (1973-07-01), Brown
patent: 4203182 (1980-05-01), Boyadjieff et al.
patent: 4389760 (1983-06-01), Krasnov
patent: 5297833 (1994-03-01), Willis et al.
patent: 5351767 (1994-10-01), Stogner et al.
patent: 6119772 (2000-09-01), Pruet
patent: 6412554 (2002-07-01), Allen et al.
patent: 6470975 (2002-10-01), Bourgoyne et al.
patent: 2658431 (1978-06-01), None
patent: 3105565 (1982-09-01), None
Bartlett & Sherer
Brill Gerow D.
Coupler Developments Limited
Sherer Ronald B.
Tsay Frank
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