US PATENT SUBCLASS 313 / 640
.~.~.~.~ And rare earth metal

Current as of: June, 1999
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313 /   HD   ELECTRIC LAMP AND DISCHARGE DEVICES

567  DF  WITH GAS OR VAPOR {24}
637  DF  .~ With particular gas or vapor {2}
638  DF  .~.~ With metal vapor {1}
639  DF  .~.~.~ Mercury vapor {2}
640.~.~.~.~ And rare earth metal {1}
641  DF  .~.~.~.~.~> With rare gas

DEFINITION

Classification: 313/640

And rare earth metal:

(under subclass 639) Subject matter wherein a rare earth metal is included in the composition.

(1) Note. The "rare earth" element are metallic in character.

(2) Note. Misch metal is an alloy of iron with mixture of rare earth metals.

(3) Note. The "rare earth" elements include the atomic numbers from 57 to 71.