US PATENT SUBCLASS 285 / 332.4
.~.~ Discontinuous interface surface

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

328  DF  PARTICULAR INTERFACE {4}
332  DF  .~ Tapered {6}
332.4.~.~ Discontinuous interface surface {1}
333  DF  .~.~.~> Threaded (e.g., drill pipe type) {1}

DEFINITION

Classification: 285/332.4

(under subclass 332) Devices wherein the surface of the interface of at least one member is interrupted to cause an irregularity therein.

SEE OR SEARCH THIS CLASS, SUBCLASS:

332.2+, for devices having a packing carried by a groove in an interface.