US PATENT SUBCLASS 411 / 493
.~.~ End structure

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.~.~ End structure {6}
494  DF  .~.~.~> Pyramidal point
495  DF  .~.~.~> Slotted end
496  DF  .~.~.~> Chisel point
497  DF  .~.~.~> Stepped end
498  DF  .~.~.~> Conical point
499  DF  .~.~.~> Having a curved surface

DEFINITION

Classification: 411/493

End structure:

(under subclass 487) Subject matter wherein significance is attributed to the piercing end of the fastener.