US PATENT SUBCLASS 501 / 98.5
.~.~.~.~ With 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}
98.4  DF  .~.~.~ Aluminum nitride containing (AIN) {2}
98.5.~.~.~.~ With alkaline earth metal compound

DEFINITION

Classification: 501/98.5

With alkaline earth metal compound:

(under subclass 98.4) Subject matter additionally containing an alkaline earth metal compound.