US PATENT SUBCLASS 148 / 668
.~.~ Refractory metal (i.e., titanium(Ti), zirconium(Zr), hafnium(Hf), vanadium(V), niobium(Nb), columbium(Cb), tantalum(Ta), chromium(Cr), molybdenum(Mo), tungsten(W)), or alloy base thereof

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


148 /   HD   METAL TREATMENT

95  DF  PROCESS OF MODIFYING OR MAINTAINING INTERNAL PHYSICAL STRUCTURE (I.E., MICROSTRUCTURE) OR CHEMICAL PROPERTIES OF METAL, PROCESS OF REACTIVE COATING OF METAL AND PROCESS OF CHEMICAL-HEAT REMOVING (E.G., FLAME-CUTTING, ETC.) OR BURNING OF METAL {17}
559  DF  .~ Heating or cooling of solid metal {22}
668.~.~ Refractory metal (i.e., titanium(Ti), zirconium(Zr), hafnium(Hf), vanadium(V), niobium(Nb), columbium(Cb), tantalum(Ta), chromium(Cr), molybdenum(Mo), tungsten(W)), or alloy base thereof {3}
669  DF  .~.~.~> Titanium(Ti) or titanium base alloy {1}
672  DF  .~.~.~> Zirconium(Zr) or zirconium base alloy
673  DF  .~.~.~> Tungsten(W) or tungsten base alloy

DEFINITION

Classification: 148/668

Refractory metal (i.e., titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), columbium (Cb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W)), or alloy base thereof:

(under subclass 559) Process wherein the metal being treated is titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), columbium (Cb), tantalum (Ta), chromium (Cr), molybdenum (Mo), tungsten (W), or an alloy thereof containing greater than 50 percent of one of said metals.