US PATENT SUBCLASS 411 / 56
.~.~ Stepped expander

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}
44  DF  .~ Including sleeve and distinct tapered expander (e.g., anchor bolt type) {9}
56.~.~ Stepped expander

DEFINITION

Classification: 411/56

Stepped expander:

(under subclass 44) Subject matter wherein the expander includes a plurality of sections of progressively increasing diameters to effect varying degrees of expansion of the sleeve.