US PATENT SUBCLASS 420 / 30
.~.~.~.~ Adding rare earth or alkaline earth metal

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

8  DF  FERROUS (I.E., IRON BASE) {24}
9  DF  .~ 1.7 percent or more carbon containing {2}
13  DF  .~.~ 2.7 percent or more carbon equivalent containing (i.e., cast iron) {7}
29  DF  .~.~.~ Processes {4}
30.~.~.~.~ Adding rare earth or alkaline earth metal

DEFINITION

Classification: 420/30

Adding rare earth or alkaline earth metal:

(under subclass 29) Process which includes a step of adding one or more of scandium, yttrium, a lantanide metal, calcium, strontium or barium to the alloy or metallic composition.