Buoys – rafts – and aquatic devices – Buoy – Having means to control attitude or position
Reexamination Certificate
2008-08-20
2010-11-30
Avila, Stephen (Department: 3617)
Buoys, rafts, and aquatic devices
Buoy
Having means to control attitude or position
C441S029000, C441S032000
Reexamination Certificate
active
07841917
ABSTRACT:
A floatation device is disclosed that comprises a container10containing a liquefied gas, a gas chamber (60, FIG.2) and a remotely operable device29. The remotely operable device is switchable between a closed state in which fluid communication between the container and the gas chamber is prevented, and an open state in which fluid communication between the container and the gas chamber is enabled and vaporization of the liquefied gas charges the gas chamber with gas. The liquefied gas may be liquid nitrogen and the container may be heat insulated with an insulating vacuum cavity. A buoyancy unit (40, FIG.2) which comprises a rigid enclosure (42, FIG.2) defining an interior volume and a flexible diaphragm (55, FIG.2) that partitions the interior volume into first and second chambers is also disclosed.
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Avila Stephen
Deep Sea Recovery Ltd
Nixon & Vanderhye P.C.
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