US PATENT SUBCLASS 423 / 440
.~.~ Refractory metal containing

Current as of: June, 1999
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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

414  DF  CARBON OR COMPOUND THEREOF {3}
439  DF  .~ Binary compound (e.g., carbide, etc.) {3}
440.~.~ Refractory metal containing

DEFINITION

Classification: 423/440

(under subclass 439) Products or processes wherein the other element is chromium, molybdenum, tungsten, vanadium, niobium, tantalum, titanium, zirconium or hafnium, known as the refactory metals.