US PATENT SUBCLASS 411 / 508
.~ Having resilient securing structure on shank

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.~ Having resilient securing structure on shank {1}
509  DF  .~.~> Concentric ridge or flange {1}

DEFINITION

Classification: 411/508

Having resilient securing structure on shank:

(under subclass 500) Subject matter provided with an elastic configuration on a shank portion of the fastening means wherein the configuration is specially adapted to retain the fastening means in a secure position.