US PATENT SUBCLASS 92 / 243
.~.~.~ Oppositely facing

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

172  DF  PISTON {19}
240  DF  .~ Side wall portion includes peripheral axially extending flexible lip {4}
242  DF  .~.~ Plural axially spaced lips {1}
243.~.~.~ Oppositely facing {1}
244  DF  .~.~.~.~> Lips formed on separable elements

DEFINITION

Classification: 92/243

(under subclass 242) Apparatus in which the spaced lips extend in opposite directions axially of the piston.