US PATENT SUBCLASS 420 / 50
.~.~.~ Over 1.5 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}
34  DF  .~ Nine percent or more chromium containing {14}
43  DF  .~.~ Eight percent or more nickel containing {6}
50.~.~.~ Over 1.5 percent silicon containing {1}
51  DF  .~.~.~.~> Group IV or V transition metal containing

DEFINITION

Classification: 420/50

Over 1.5 percent silicon containing:

(under subclass 43) Alloy or metallic composition which additionally contains more than 1.5 percent silicon.