US PATENT SUBCLASS 501 / 128
.~.~.~.~ And silicon compound other than clay

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.~.~.~.~ And silicon compound other than clay {2}
129  DF  .~.~.~.~.~> And silica-clay mixtures
130  DF  .~.~.~.~.~> And clay containing {1}

DEFINITION

Classification: 501/128

And silicon compound other than clay:

(under subclass 127) Subject matter additionally containing a compound of silicon other than clay.