US PATENT SUBCLASS 419 / 20-- .~.~.~ Rare earth oxide

US PATENT SUBCLASS 419 / 20
.~.~.~ Rare earth oxide

Current as of: June, 1999
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419 /	HD	POWDER METALLURGY PROCESSES

1	DF	POWDER METALLURGY PROCESSES WITH HEATING OR SINTERING {16}
10	DF	.~ Metal and nonmetal in final product {5}
19	DF	.~.~ Oxide containing {3}
20		.~.~.~ Rare earth oxide

DEFINITION

Classification: 419/20

Rare earth oxide:

(under subclass 19) Processes wherein the oxide contained in the final product is a binary compound of oxygen and a rare earth element.

(1) Note. For the purpose of this classification the term "rare earth" includes elements with atomic numbers 57-71 and

87+, i.e., lanthanum, cerium, praesodymium, neodymium, promethium, sam erium, europium, adolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutecium, francium, radium, actinium, thorium, pratinium, uranium, neptunium, plutonium, americium, curium, berkelium, californium, einsteinium, fermium, mendeleyium, noblium and lawrencium.