US PATENT SUBCLASS 411 / 436
.~ Thread structure

Current as of: June, 1999
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411 /   HD   EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER

427  DF  INTERNALLY THREADED FASTENER ELEMENT, E.G., NUT, ETC. {5}
436.~ Thread structure {2}
437  DF  .~.~> Interrupted
438  DF  .~.~> Coil spring

DEFINITION

Classification: 411/436

Thread structure:

(under subclass 427) Subject matter where significance is attributed to the helical ridge.