US PATENT SUBCLASS 411 / 80.1
.~ Comprising a head and expandable portions spread by fastener (e.g., drywall anchor)


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411 /   HD   EXPANDED, THREADED, DRIVEN, HEADED, TOOL-DEFORMED, OR LOCKED-THREADED FASTENER

15  DF  HAVING SEPARATE EXPANDER MEANS {13}
80.1.~ Comprising a head and expandable portions spread by fastener (e.g., drywall anchor) {1}
80.2  DD  .~.~> Three or more expandable portions