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

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.