US PATENT SUBCLASS 411 / 497
.~.~.~ Stepped end

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}
487  DF  .~ Shank or penetrating end structure {5}
493  DF  .~.~ End structure {6}
497.~.~.~ Stepped end

DEFINITION

Classification: 411/497

Stepped end:

(under subclass 493) Subject matter wherein the piercing end comprises a series of sections each successive one of which is of increased transverse dimension in the longitudinal direction towards the impact receiving surface.