Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Reexamination Certificate
2003-01-16
2004-06-22
Lee, Jong-Suk (James) (Department: 3673)
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Submerging, raising, or manipulating line of pipe or cable...
C405S158000, C166S387000, C138S093000, C294S066100
Reexamination Certificate
active
06752569
ABSTRACT:
BACKGROUND AND BRIEF SUMMARY OF THE INVENTION
This invention concerns a tool for use in deep water, which tool consists of or includes a sealing device.
Such a tool, with a sealing device, may be used for recovery of pipelines from such great depths that all work has to be carried out by remotely operated vehicles, as opposed to divers. A number of known tools of this type use hydraulic pressure to operate the sealing device, whereby the tool fastens itself to a pipe section, for hauling same back to the surface. Obviously, these tools rely on having a hydraulic line from the surface to the tool, which may be on the sea bed.
An object of the present invention is to obviate the need for such a hydraulic line.
According to the present invention, in a sealing device of an underwater tool, external water pressure at depth can act on a piston, which is movable within a chamber, to cause it to compress a seal member.
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BSW Limited
Gauthier & Connors LLP
Lee Jong-Suk (James)
LandOfFree
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