US PATENT SUBCLASS 411 / 477
.~ Of sheet metal

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}
477.~ Of sheet metal {2}
478  DF  .~.~> Folded or twisted
479  DF  .~.~> Hollow fastener

DEFINITION

Classification: 411/477

Of sheet metal:

(under subclass 439) Subject matter wherein the fastener is formed from sheet metal.

(1) Note. The fastener is usually formed by cutting or stamping.