US PATENT SUBCLASS 92 / 178
.~ With ball or roller anti-friction means on side wall portion

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

172  DF  PISTON {19}
178.~ With ball or roller anti-friction means on side wall portion

DEFINITION

Classification: 92/178

(under subclass 172) Apparatus including a ball or roller bearing means mounted on the piston for engagement with a working chamber wall when the piston is in operative position.

SEE OR SEARCH CLASS

384, Bearings, appropriate subclasses for linear bearings with ball or roller anti-friction contacting surfaces. Class 384 takes a nominally claimed piston and cylinder having ball or roller type anti-friction contacting surfaces.