US PATENT SUBCLASS 411 / 454
.~.~.~.~.~ Defined by twisted shank

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

439  DF  IMPACT DRIVEN FASTENER, E.G., NAIL, SPIKE, TACK, ETC. {13}
446  DF  .~ Including integral locking means {3}
451.1  DD  .~.~ Comprising protrusion or recess on shank {7}
452  DF  .~.~.~ Longitudinal rib {1}
453  DF  .~.~.~.~ Spiral rib {1}
454.~.~.~.~.~ Defined by twisted shank

DEFINITION

Classification: 411/454

Defined by twisted shank:

(under subclass 453) Subject matter wherein the ridge rib is formed by the shank having been subjected to torsion about its axis.