US PATENT SUBCLASS 420 / 24
.~.~.~.~ Magnesium present in agent only as a compound with a nonmetal

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}
18  DF  .~.~.~ Processes of adding magnesium {7}
24.~.~.~.~ Magnesium present in agent only as a compound with a nonmetal

DEFINITION

Classification: 420/24

Magnesium present in agent only as a compound with a nonmetal:

(under subclass 18) Process wherein the magnesium is added to the iron alloy only as a compound with a nonmetal and the

additive contains no metallic magnesium or alloy thereof.

(1) Note. To be classified in this subclass, there must be a positive disclosure that the magnesium compound decomposes or reacts to yield metallic magnesium in the iron alloy. In the absence of such disclosure a patent is classified elsewhere under subclasses 13+ as appropriate.