US PATENT SUBCLASS 411 / 31
.~.~.~ Serrated end

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

15  DF  HAVING SEPARATE EXPANDER MEANS {13}
29  DF  .~ With hole forming means {1}
30  DF  .~.~ Formed on expansible sleeve {1}
31.~.~.~ Serrated end

DEFINITION

Classification: 411/31

Serrated end:

(under subclass 30) Subject matter wherein the aperture forming means is in the form of sharp teeth peripherally arranged about the end of the sleeve.