US PATENT SUBCLASS 411 / 527
.~.~.~.~ And helically inclined tongues, e.g., speed nut, etc.

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  DF  .~.~ Sheet metal {5}
525  DF  .~.~.~ Having plural longitudinal slits {2}
527.~.~.~.~ And helically inclined tongues, e.g., speed nut, etc.

DEFINITION

Classification: 411/527

And helically inclined tongues, e.g., speed nut, etc.:

(under subclass 525) Subject matter wherein the material is formed such as to produce a pair of promontory structures having deformed edges tracing a helical path.