US PATENT SUBCLASS 411 / 441
.~.~ Discrete guide or centering 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}
440  DF  .~ Having means to facilitate explosive driving {1}
441.~.~ Discrete guide or centering means

DEFINITION

Classification: 411/441

Discrete guide or centering means:

(under subclass 440) Subject matter wherein the specially adapted means comprises an alignment or guiding element mounted on a shank portion of the fastener wherein the element is structured to engage and cooperate with an interior surface of a bore of an explosively actuated driving tool.