US PATENT SUBCLASS 420 / 447
.~.~.~.~ Tantalum, niobium, vanadium, or hafnium 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}
447.~.~.~.~ Tantalum, niobium, vanadium, or hafnium containing {1}
448  DF  .~.~.~.~.~> Molybdenum or tungsten containing

DEFINITION

Classification: 420/447

Tantalum, niobium, vanadium or hafnium containing:

(under subclass 446) Alloy which additionally contains at least one, or the metals tantalum, niobium, vanadium, or hafnium.