US PATENT SUBCLASS 420 / 500
.~ Sulfur, selenium, or tellurium containing

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

469  DF  COPPER BASE {15}
500.~ Sulfur, selenium, or tellurium containing

DEFINITION

Classification: 420/500

Sulfur, selenium or tellurium containing:

(under subclass 469) Alloy, or metallic composition which additionally contains at least one of the elements sulfur, selenium, or tellurium.