US PATENT SUBCLASS 501 / 89
.~.~.~ And aluminum compound

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

1  DF  CERAMIC COMPOSITIONS {15}
87  DF  .~ Carbide or oxycarbide containing {2}
88  DF  .~.~ Silicon carbide {4}
89.~.~.~ And aluminum compound

DEFINITION

Classification: 501/89

And aluminum compound:

(under subclass 88) Subject matter additionally comprising a compound of aluminum.

(1) Note. The aluminum compound may be, for example, Al2O3 or clay.