US PATENT SUBCLASS 285 / 334
.~.~.~.~ Flat crest

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  DF  .~.~.~ Threaded (e.g., drill pipe type) {1}
334.~.~.~.~ Flat crest

DEFINITION

Classification: 285/334

(under subclass 333) Subject matter wherein the threads are flat crested, e.g., square or acme.