US PATENT SUBCLASS 420 / 40
.~.~ Rare earth containing

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

8  DF  FERROUS (I.E., IRON BASE) {24}
34  DF  .~ Nine percent or more chromium containing {14}
40.~.~ Rare earth containing

DEFINITION

Classification: 420/40

Rare earth containing:

(under subclass 34) Alloy or metallic composition which additionally contains at least one of scandium, yttrium or a lanthanide metal.