US PATENT SUBCLASS 411 / 422
.~.~.~ By transversely extending bore

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}
417  DF  .~.~ Circumferentially interrupted thread {2}
422.~.~.~ By transversely extending bore

DEFINITION

Classification: 411/422

By peripherally closed transversely extending aperture:

(under subclass 417) Subject matter wherein the ridge discontinuity comprises a peripherially closed cavity having an axis transverse to the fastening means axis.