US PATENT SUBCLASS 75 / 611
.~.~.~.~ Refractory metal, singly or in combination

Current as of: June, 1999
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75 /   HD   SPECIALIZED METALLURGICAL PROCESSES, COMPOSITIONS FOR USE THEREIN, CONSOLIDATED METAL POWDER COMPOSITIONS, AND LOOSE METAL PARTICULATE MIXTURES

330  DF  PROCESSES {9}
392  DF  .~ Producing or treating free metal {10}
414  DF  .~.~ At 300 degrees C or greater (e.g., pyrometallurgy, etc.) {7}
585  DF  .~.~.~ Nonferrous {25}
611.~.~.~.~ Refractory metal, singly or in combination {3}
612  DF  .~.~.~.~.~> Titanium(Ti), Zirconium(Zr), or Hafnium(Hf), singly or in combination {2}
622  DF  .~.~.~.~.~> Vanadium(V), Niobium(Nb) or Columbium(Cb), or Tantalum(Ta), singly or in combination
623  DF  .~.~.~.~.~> Chromium(Cr), Molybdenum(Mo), or Tungsten(W), singly or in combination

DEFINITION

Classification: 75/611

Refractory metal, singly or in combination:

(under subclass 585) Process in which a Refractory metal (i.e., Titanium (Ti), Zirconium (Zr), Hafnium (Hf), Vanadium (V), Niobium (Nb) or Columbium (Cb), Tantalum (Ta), Chromium (Cr), Molybdenum (Mo), or Tungsten (W)) is produced or a metal that contains over 50 percent by weight Refractory metal, singly or in combination, is treated.