US PATENT SUBCLASS 92 / 253
.~.~.~ Axially spaced flexible side wall forming elements with interposed rigid spacer member

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

172  DF  PISTON {19}
248  DF  .~ Nonmetallic portion {1}
249  DF  .~.~ Flexible {3}
253.~.~.~ Axially spaced flexible side wall forming elements with interposed rigid spacer member

DEFINITION

Classification: 92/253

(under subclass 249) Apparatus in which the flexible portion forms a side wall portion of the piston and includes a pair of axially spaced flexible elements having a nonflexible member interposed between said elements.

SEE OR SEARCH THIS CLASS, SUBCLASS:

251+, for two or more axially spaced flexible nonmetallic elements interposed between separable rigid members, and including a rigid spacer member positioned between said elements.