US PATENT SUBCLASS 92 / 257
.~.~ Side wall portion interposed between separable axially spaced rigid members

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

172  DF  PISTON {19}
255  DF  .~ Plural separable parts {3}
257.~.~ Side wall portion interposed between separable axially spaced rigid members {1}
258  DF  .~.~.~> Rigid members connected by coaxial rigid stem or rod

DEFINITION

Classification: 92/257

(under subclass 255) Apparatus comprising a side wall forming portion and two axially spaced rigid members, said side wall forming portion being interposed between said members, said members being detachably secured together.

SEE OR SEARCH THIS CLASS, SUBCLASS:

205+, for a piston having a side wall portion interposed between a pair of separable axially spaced rigid members and in which movement of the rigid members toward or away from each other effects radial adjustment of said side wall portion

250+, for a piston having a flexible nonmetallic side wall portion interposed between separable axially spaced rigid members.