US PATENT SUBCLASS 420 / 72
.~ Eight percent or more manganese containing

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

8  DF  FERROUS (I.E., IRON BASE) {24}
72.~ Eight percent or more manganese containing {4}
73  DF  .~.~> Nickel containing
74  DF  .~.~> Chromium containing
75  DF  .~.~> Titanium containing
76  DF  .~.~> Copper containing

DEFINITION

Classification: 420/72

Eight percent or more manganese containing:

(under subclass 8) Alloy or metallic composition which additionally contains 8 percent or more of manganese.

(1) Note. The alloys classified in this and indented subclass are often referred to as "authenitic manganese steel" or "Hadfield steel". These recitations shall be considered prima facie sufficient for classification hereunder in the absence of an indication that the alloy does not contain 8 percent or more manganese.