US PATENT SUBCLASS 411 / 901
.~ Core and exterior of different materials

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

900  DF  FASTENER OR FASTENER ELEMENT COMPOSED OF PLURAL DIFFERENT MATERIALS {1}
901.~ Core and exterior of different materials {1}
902  DF  .~.~> Metal core {1}

DEFINITION

Classification: 411/901

Core and exterior or different materials:

Art collection of fastener or fastener elements in which the interior and exterior portions are made of distinct different substances.