US PATENT SUBCLASS 411 / 503
.~.~.~ Sheet metal type

Current as of: June, 1999
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411 /   HD   EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER

500  DF  HEADED FASTENER ELEMENT {2}
501  DF  .~ Having plastically flowable or deflectable end, e.g., rivet, etc. {2}
502  DF  .~.~ Plural end legs {1}
503.~.~.~ Sheet metal type

DEFINITION

Classification: 411/503

Sheet metal type:

(under subclass 502) Subject matter wherein the fastening means is made or formed from a planar piece of metallic material.