US PATENT SUBCLASS 411 / 387.1
.~.~ Drill-tip-type end


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

378  DF  EXTERNALLY THREADED FASTENER ELEMENT, E.G., BOLT, SCREW, ETC. {16}
386  DF  .~ Pilot end having means enhancing fastening or installation {1}
387.1.~.~ Drill-tip-type end {5}
387.2  DD  .~.~.~> Having a reaming portion
387.3  DD  .~.~.~> Having enhanced gripping structure
387.4  DD  .~.~.~> Thread-tapping portion or with thread pitch stabilizing ridge
387.5  DD  .~.~.~> Having distinct, spaced cutting edges or points (e.g., prongs)
387.6  DD  .~.~.~> Resembling a twist-drill-type bit {2}