US PATENT SUBCLASS 420 / 422
ZIRCONIUM OR HAFNIUM BASE

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

422ZIRCONIUM OR HAFNIUM BASE {1}
423  DF  .~> Copper containing

DEFINITION

Classification: 420/422

ZIRCONIUM OR HAFNIUM BASE:

(under the class definition) Alloy, or metallic composition which contains over 50 percent of zirconium or over 50 percent of hafnium.