US PATENT SUBCLASS 411 / 509
.~.~ Concentric ridge or flange

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}
508  DF  .~ Having resilient securing structure on shank {1}
509.~.~ Concentric ridge or flange {1}
510  DF  .~.~.~> Plural ridges or flanges

DEFINITION

Classification: 411/509

Concentric ridge or flange:

(under subclass 508) Subject matter wherein the configuration is a raised crested portion or protruding edge on and concentric to the shank portion.