US PATENT SUBCLASS 92 / 110
.~ Hollow stem forms axially extending fluid passage

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

109  DF  PISTON WITH RIGID AXIALLY EXTENDING HOLLOW STEM {2}
110.~ Hollow stem forms axially extending fluid passage {2}
111  DF  .~.~> Plural laterally spaced passages
112  DF  .~.~> Passage communicates with lateral port extending through piston side wall portion

DEFINITION

Classification: 92/110

(under subclass 109) Apparatus in which the tubular element forms a conduit or passage through which a fluid is conducted.

SEE OR SEARCH CLASS

91, Motors: Expansible Chamber Type,

376+, for a hollow piston rod provided with a valve within said hollow rod.

417, Pumps,

486, for an expansible chamber type pump having a fluid conduit rigidly fixed to the piston, and see the search note therein.