US PATENT SUBCLASS 252 / 520.5
.~.~ Tungsten or yttrium compound

Current as of: June, 1999
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252 /   HD   COMPOSITIONS

500  DF  ELECTRICALLY CONDUCTIVE OR EMISSIVE COMPOSITIONS {6}
518.1  DF  .~ Metal compound containing {16}
520.5.~.~ Tungsten or yttrium compound

DEFINITION

Classification: 252/520.5

Tungsten or yttrium compound:

(under subclass 518.1) Compositions wherein the metal compound is a tungsten compound or an yttrium compound.