US PATENT SUBCLASS 92 / 158
.~ Piston has lubricant retaining or conducting means

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

153  DF  WITH LUBRICATING MEANS {5}
158.~ Piston has lubricant retaining or conducting means {2}
159  DF  .~.~> Pocket or chamber
160  DF  .~.~> Port or passage extending through side wall portion

DEFINITION

Classification: 92/158

(under subclass 153) Apparatus comprising a piston provided with means for (1) holding or storing lubricant or (2) conveying or guiding lubricant from one location on the piston to another location thereon.

(1) Note. Such means may include an open peripheral groove or channel either sectional or continuous, a port, slit, or any opening through a portion of the piston disclosed as for the purpose of conducting lubricant from one point to another.