US PATENT SUBCLASS 501 / 90
.~.~.~ And carbonaceous material


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}
90.~.~.~ And carbonaceous material


DEFINITION

Classification: 501/90

And carbonaceous material:

(under subclass 88) Subject matter additionally comprising a material containing free carbon.

(1) Note. The free carbon containing material may be, for example, graphite or tar.