US PATENT SUBCLASS 420 / 9
.~ 1.7 percent or more carbon containing

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

8  DF  FERROUS (I.E., IRON BASE) {24}
9.~ 1.7 percent or more carbon containing {2}
10  DF  .~.~> Six percent or more total group IV, V or VI transition metals containing {1}
13  DF  .~.~> 2.7 percent or more carbon equivalent containing (i.e., cast iron) {7}

DEFINITION

Classification: 420/9

1.7 percent or more carbon containing:

(under subclass 8) Alloy or metallic composition which additionally contains 1.7 percent or more carbon.

(1) Note. This and indented subclasses contain patents drawn to graphitic steel.