US PATENT SUBCLASS 411 / 425
.~.~.~ Twisted

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}
424  DF  .~.~ Shank structure {2}
425.~.~.~ Twisted

DEFINITION

Classification: 411/425

Twisted:

(under subclass 424) Subject matter wherein the shank is formed by subjecting it to torsional plastic deformation.