US PATENT SUBCLASS 92 / 93
.~.~ Annular flexible wall portion peripherally sealed to spaced relatively fixed concentric rigid members

Current as of: June, 1999
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92 /   HD   EXPANSIBLE CHAMBER DEVICES

89  DF  COLLAPSIBLE CHAMBER WALL PORTION (E.G., HINGED OR FLEXIBLE WALL) {1}
90  DF  .~ Wall portion formed of flexible material {5}
93.~.~ Annular flexible wall portion peripherally sealed to spaced relatively fixed concentric rigid members

DEFINITION

Classification: 92/93

(under subclass 90) Apparatus comprising a pair of concentric rigid members, said members being fixed with respect to each other and being radially spaced from each other to provide a ring shaped space therebetween and a ring shaped flexible wall portion spanning said space and having the inner periphery thereof in sealing engagement with the inner member and the outer periphery thereof in sealing engagement with the outer member.