US PATENT SUBCLASS 411 / 455
.~.~.~ Circumferential rib

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}
455.~.~.~ Circumferential rib

DEFINITION

Classification: 411/455

Circumferential rib:

(under subclass 451.1) Subject matter wherein the outwardly extending structure comprises a continuous narrow ridge extending about the periphery of the shank.