US PATENT SUBCLASS 252 / 521.1
.~.~ Rare earth metal 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}
521.1.~.~ Rare earth metal compound


DEFINITION

Classification: 252/521.1

Rare earth metal compound:

(under subclass 518.1) Compositions wherein the metal compound is a rare earth metal compound.

(1) Note. The rare earth metals are lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), samarium (Sm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), and lutetium (Lu).

SEE OR SEARCH THIS CLASS, SUBCLASS:

509, for conductive or emissive compositions containing a rare earth metal compound and elemental carbon.