US PATENT SUBCLASS 501 / 129
.~.~.~.~.~ And silica-clay mixtures

Current as of: June, 1999
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501 /   HD   COMPOSITIONS: CERAMIC

1  DF  CERAMIC COMPOSITIONS {15}
94  DF  .~ Refractory {8}
126  DF  .~.~ Trivalent metal compound (e.g., iron oxide, chromium oxide, trivalent rare earth oxide, etc.) containing {2}
127  DF  .~.~.~ Aluminum compound (e.g., clay, aluminium oxide, etc.) {1}
128  DF  .~.~.~.~ And silicon compound other than clay {2}
129.~.~.~.~.~ And silica-clay mixtures

DEFINITION

Classification: 501/129

And silica-clay mixtures:

(under subclass 128) Subject matter wherein the silicon compound is silica and the aluminum compound is clay.