US PATENT SUBCLASS 92 / 175
.~ Spaced faces joined by rigid stem (e.g., spool)


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

172  DF  PISTON {19}
175.~ Spaced faces joined by rigid stem (e.g., spool)


DEFINITION

Classification: 92/175

(under subclass 172) Apparatus in which the piston includes a pair of axially spaced portions each of which includes an end face and a side wall, said spaced portions being rigidly joined by a portion of smaller peripheral extent than the spaced portions.

SEE OR SEARCH THIS CLASS, SUBCLASS:

138, for a piston provided with spaced faces joined by a rigid stem, in which the stem is provided with a linkage or transmission engaging portion.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

324+, for a spool type piston valve.