US PATENT SUBCLASS 285 / 355
.~ Screw

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

335  DF  PACKED {20}
355.~ Screw

DEFINITION

Classification: 285/355

(under subclass 335) Subject matter comprising screw threads at the coupling interface.

SEE OR SEARCH THIS CLASS, SUBCLASS:

148.19+, for differential screw threads.

328+, for a particular interface, especially subclasses 333+ for a threaded conically tapered interface.

390+, for unpacked screw couplings.