US PATENT SUBCLASS 420 / 78
.~.~ Over 2 percent silicon containing

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

8  DF  FERROUS (I.E., IRON BASE) {24}
77  DF  .~ Four percent or more aluminum containing {4}
78.~.~ Over 2 percent silicon containing

DEFINITION

Classification: 420/78

Over 2 percent silicon containing:

(under subclass 77) Alloy or metallic composition which additionally contains more than 2 percent silicon.