US PATENT SUBCLASS 420 / 449
.~.~.~.~ Zirconium or boron containing

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

441  DF  NICKEL BASE {6}
442  DF  .~ Chromium containing {5}
445  DF  .~.~ Aluminum containing {1}
446  DF  .~.~.~ Titanium containing {3}
449.~.~.~.~ Zirconium or boron containing

DEFINITION

Classification: 420/449

Zirconium or boron containing:

(under subclass 446) Alloy, or metallic composition which additionally contains at least one of the elements zirconium, or boron.