US PATENT SUBCLASS 285 / 259
.~.~.~ Particular surface

Current as of: June, 1999
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285 /   HD   PIPE JOINTS OR COUPLINGS

238  DF  NONMETAL TO METAL {1}
239  DF  .~ Internal member (e.g., sleeve or nipple) {2}
242  DF  .~.~ External clamp or holder {8}
259.~.~.~ Particular surface

DEFINITION

Classification: 285/259

(under subclass 242) Subject matter wherein the internal surface of the external clamp or holder or the external surface of the internal member, or both have a particular surface or surfaces for increasing the gripping friction.

SEE OR SEARCH THIS CLASS, SUBCLASS:

328+, for a coupling comprising a particular joint interface.