US PATENT SUBCLASS 420 / 28
.~.~.~ Over .1 percent aluminum 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  DF  .~ 1.7 percent or more carbon containing {2}
13  DF  .~.~ 2.7 percent or more carbon equivalent containing (i.e., cast iron) {7}
28.~.~.~ Over .1 percent aluminum containing

DEFINITION

Classification: 420/28

Over .1 percent aluminum containing:

(under subclass 13) Alloy or metallic composition which additionally contains more than 0.1 percent of aluminum.