US PATENT SUBCLASS 420 / 455
.~ Rare earth containing

Current as of: June, 1999
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420 /   HD   ALLOYS OR METALLIC COMPOSITIONS

441  DF  NICKEL BASE {6}
455.~ Rare earth containing

DEFINITION

Classification: 420/455

Rare earth containing:

(under subclass 441) Alloy, or metallic composition which additionally contains at least one of the metals scandium, yttrium, or lanthanium through lutetum (i.e., atomic numbers 57 through 71).