US PATENT SUBCLASS 420 / 99
.~ One percent or more carbon containing, but less than 1.7 percent

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

8  DF  FERROUS (I.E., IRON BASE) {24}
99.~ One percent or more carbon containing, but less than 1.7 percent {1}
100  DF  .~.~> Chromium containing {1}

DEFINITION

Classification: 420/99

One percent or more carbon containing, but less than 1.7 percent:

(under subclass 8) Alloy or metallic composition containing 1 percent or more carbon.

(1) Note. Due to schedule superiority, alloys containing 1.7 percent or more carbon are classified above in subclasses 9+. Patents classified in subclasses 9+ above are not cross-referenced to this or indented subclasses unless there is a positive disclosure of an alloy containing less that 1.7 percent carbon.