US PATENT SUBCLASS 106 / 631
.~.~ Perlite, rock, stone, shale, slate, flint, granite, feldspar or limestone containing

Current as of: June, 1999
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106 /   HD   COMPOSITIONS: COATING OR PLASTIC

*  DD  COATING OR PLASTIC COMPOSITIONS {40}
600  DF  .~ Alkali metal silicate containing {23}
631.~.~ Perlite, rock, stone, shale, slate, flint, granite, feldspar or limestone containing

DEFINITION

Classification: 106/631

Perlite, rock, stone, shale, slate, flint, granite, feldspar or limestone containing:

(under subclass 600) Subject matter employing perlite, rock, stone, shale, slate, flint, granite, feldspar or limestone.

SEE OR SEARCH THIS CLASS, SUBCLASS:

400, and 467, for filler materials, per se.