US PATENT SUBCLASS 92 / 174
.~ Liquid between axially spaced side wall portions

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

172  DF  PISTON {19}
174.~ Liquid between axially spaced side wall portions

DEFINITION

Classification: 92/174

(under subclass 172) Apparatus in which the piston includes a pair of axially spaced rigid side wall portions and a body of liquid positioned between said spaced portions for direct engagement with such chamber wall when said piston is in operative position.

SEE OR SEARCH CLASS

277, Seal for a Joint or Juncture, for a generic sealing means or process,

411+, for a dynamic close proximity seal (e.g., contactless, fluent, etc.) having a gap or clearance.