US PATENT SUBCLASS 501 / 98.2
.~.~.~.~ With rare earth or alkaline earth metal compound

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

1  DF  CERAMIC COMPOSITIONS {15}
94  DF  .~ Refractory {8}
96.1  DF  .~.~ Boride, silicide, nitride, oxynitride, carbonitride, or oxycarbonitride containing {7}
98.1  DF  .~.~.~ Silicon aluminum oxynitride containing (i.e., SiAION compounds) {2}
98.2.~.~.~.~ With rare earth or alkaline earth metal compound

DEFINITION

Classification: 501/98.2

With rare earth or alkaline earth metal compound:

(under subclass 98.1) Compositions in which a rare earth or alkaline earth metal compound is found.