US PATENT SUBCLASS 92 / 248
.~ Nonmetallic portion

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

172  DF  PISTON {19}
248.~ Nonmetallic portion {1}
249  DF  .~.~> Flexible {3}

DEFINITION

Classification: 92/248

(under subclass 172) Apparatus in which the piston includes a portion made of nonmetallic material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

125, for a vane like oscillating piston provided with a nonmetallic peripheral sealing portion.

212, for an open ended skirt type piston provided with a nonmetallic portion.