US PATENT SUBCLASS 411 / 494
.~.~.~ Pyramidal point

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}
494.~.~.~ Pyramidal point

DEFINITION

Classification: 411/494

Pyramidal point:

(under subclass 493) Subject matter wherein the piercing end has the shape of a polyhedron having a polygonal base and triangular faces meeting at a common point.