US PATENT SUBCLASS 252 / 509
.~.~.~ Magnesium, alkaline earth metal, or rare earth metal compound

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

500  DF  ELECTRICALLY CONDUCTIVE OR EMISSIVE COMPOSITIONS {6}
502  DF  .~ Elemental carbon containing {5}
506  DF  .~.~ With metal compound {3}
509.~.~.~ Magnesium, alkaline earth metal, or rare earth metal compound

DEFINITION

Classification: 252/509

(under subclass 506) Compositions which contain a magnesium, alkaline earth metal or rare earth metal compound in addition to the elemental carbon.

SEE OR SEARCH THIS CLASS, SUBCLASS:

521.1, for other conductive or emissive compositions which contain a rare earth compound.