US PATENT SUBCLASS 411 / 446
.~ Including integral locking means

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

439  DF  IMPACT DRIVEN FASTENER, E.G., NAIL, SPIKE, TACK, ETC. {13}
446.~ Including integral locking means {3}
447  DF  .~.~> Comprising deformable portion {1}
450  DF  .~.~> Having means engageable on underside of member being secured by fastener
451.1  DD  .~.~> Comprising protrusion or recess on shank {7}

DEFINITION

Classification: 411/446

Including integral locking means:

(under subclass 439) Subject matter wherein the fastener is provided with means unitary thereto specially adapted to prevent or render difficult withdrawal subsequent to driving of the fastener.