US PATENT SUBCLASS 411 / 480
.~ Separately attached head

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}
480.~ Separately attached head

DEFINITION

Classification: 411/480

Separately attached head:

(under subclass 439) Subject matter wherein the impact receiving surface of the fastener is an initially discrete element which is subsequently secured to a shank portion.