US PATENT SUBCLASS 411 / 387.3
.~.~.~ Having enhanced gripping structure


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  DD  .~.~ Drill-tip-type end {5}
387.3.~.~.~ Having enhanced gripping structure