US PATENT SUBCLASS 411 / 487
.~ Shank or penetrating 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.~ Shank or penetrating end structure {5}
488  DF  .~.~> Flat-sided shank {1}
490  DF  .~.~> Stepped shank
491  DF  .~.~> Oval or lobular shank
492  DF  .~.~> Angular shank portion
493  DF  .~.~> End structure {6}

DEFINITION

Classification: 411/487

Shank or penetrating end structure:

(under subclass 439) Subject matter wherein significance is attributed to a piercing end or the shank portion between the piercing end and the impact receiving surface.