US PATENT SUBCLASS 411 / 520
.~.~ Sheet metal

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

511  DF  FASTENER SECURING ELEMENT {3}
516  DF  .~ Resilient metallic {3}
520.~.~ Sheet metal {5}
521  DF  .~.~.~> Circular
522  DF  .~.~.~> Parallel legs, e.g., U-shaped, etc. {1}
525  DF  .~.~.~> Having plural longitudinal slits {2}
528  DF  .~.~.~> Having longitudinal slit coincident with element axis
529  DF  .~.~.~> Having longitudinal slot forming fastener engaging slide

DEFINITION

Classification: 411/520

Sheet metal:

(under subclass 516) Subject matter wherein the element structure is formed from a substantially flat planar piece of metallic material.