US PATENT SUBCLASS 411 / 499
.~.~.~ Having a curved surface

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}
499.~.~.~ Having a curved surface

DEFINITION

Classification: 411/499

Having a curved surface:

(under subclass 493) Subject matter wherein the piercing end is in the shape of a continuous smooth arcuate three-dimensional figure boundary.