US PATENT SUBCLASS 501 / 133
.~.~ Silica containing

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

1  DF  CERAMIC COMPOSITIONS {15}
94  DF  .~ Refractory {8}
133.~.~ Silica containing

DEFINITION

Classification: 501/133

Silica containing:

(under subclass 94) Subject matter wherein the refractory composition comprises silica.