US PATENT SUBCLASS 411 / 389
.~.~ Both ends threaded

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}
388  DF  .~ Double-ended {1}
389.~.~ Both ends threaded

DEFINITION

Classification: 411/389

Both ends threaded:

(under subclass 388) Subject matter wherein each end configuration of the fastening means is provided with a helical ridge.