US PATENT SUBCLASS 420 / 581
.~ Iron containing

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

580  DF  CONTAINING OVER 50 PER CENT METAL BUT NO BASE METAL {4}
581.~ Iron containing {2}
582  DF  .~.~> Copper containing
583  DF  .~.~> Chromium containing {1}

DEFINITION

Classification: 420/581

Iron containing:

(under subclass 580) Alloy, or metallic composition which contains iron in an amount which does not exceed 50 percent by weight.