US PATENT SUBCLASS 420 / 563
LEAD BASE

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

563LEAD BASE {8}
564  DF  .~> Alkali, alkaline earth metal or magnesium containing {1}
566  DF  .~> Silver containing
567  DF  .~> Arsenic containing {1}
570  DF  .~> Tin containing {1}
572  DF  .~> Antimony containing
573  DF  .~> Copper containing
574  DF  .~> Zinc containing
575  DF  .~> Cadmium containing

DEFINITION

Classification: 420/563

LEAD BASE:

(under the class definition) Alloy, or metallic composition containing over 50 percent of lead by weight.