US PATENT SUBCLASS 501 / 126
.~.~ Trivalent metal compound (e.g., iron oxide, chromium oxide, trivalent rare earth oxide, etc.) containing

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

1  DF  CERAMIC COMPOSITIONS {15}
94  DF  .~ Refractory {8}
126.~.~ 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}
132  DF  .~.~.~> Chromium compound containing

DEFINITION

Classification: 501/126

Trivalent metal compound (e.g., iron oxide, chromium oxide, trivalent rare earth oxide, etc.) containing:

(under subclass 94) Subject matter containing a compound of a trivalent metal.

(1) Note. The trivalent compound, may be, for example, an oxide of trivalent iron, trivalent chromium, or a trivalent rare earth.