US PATENT SUBCLASS 420 / 501
SILVER BASE

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

501SILVER BASE {3}
502  DF  .~> Copper containing {2}
505  DF  .~> Other noble metal containing
506  DF  .~> Zinc, or cadmium containing

DEFINITION

Classification: 420/501

SILVER BASE:

(under the class definition) Alloy, or metallic composition

which contains over 50 percent of silver by weight.