US PATENT SUBCLASS 411 / 414
.~.~ Buttress thread

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

378  DF  EXTERNALLY THREADED FASTENER ELEMENT, E.G., BOLT, SCREW, ETC. {16}
411  DF  .~ Thread or shank structure {7}
414.~.~ Buttress thread

DEFINITION

Classification: 411/414

Buttress thread:

(under subclass 411) Subject matter wherein the cross section of the ridge comprises a gradual leading flank and an abrupt trailing flank which intersect to define a relatively pointed ridge crest.