US PATENT SUBCLASS 285 / 333
.~.~.~ Threaded (e.g., drill pipe type)

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  DF  .~.~ Discontinuous interface surface {1}
333.~.~.~ Threaded (e.g., drill pipe type) {1}
334  DF  .~.~.~.~> Flat crest

DEFINITION

Classification: 285/333

(under subclass 332.4) Subject matter comprising a threaded portion generally on the tapered surfaces, e.g., pin and box

drill pipe couplings.

SEE OR SEARCH THIS CLASS, SUBCLASS:

36, for pin and box drill couplings with attached thread jamming preventers.