US PATENT SUBCLASS 411 / 397
.~.~ Threadedly attached to shank

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}
396  DF  .~ Separate head element {1}
397.~.~ Threadedly attached to shank

DEFINITION

Classification: 411/397

Threadedly attached to shank:

(under subclass 396) Subject matter wherein the attachment is by mating exterior and interior helical ridge structure.