US PATENT SUBCLASS 411 / 450
.~.~ Having means engageable on underside of member being secured by fastener

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  DF  .~ Including integral locking means {3}
450.~.~ Having means engageable on underside of member being secured by fastener

DEFINITION

Classification: 411/450

Having means engageable on underside of member being secured by fastener:

(under subclass 446) Subject matter wherein the fastener includes a portion which is adapted to be beneath a member being secured by means of a separate operation after the fastener has been driven.

(1) Note. The separate operation, e.g., could be partial rotation of the fastener.