US PATENT SUBCLASS 423 / 75
.~.~ Volatizing


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

1  DF  TREATING MIXTURE TO OBTAIN METAL CONTAINING COMPOUND {15}
69  DF  .~ Group IVB metal (Ti, Zr, or Hf) {11}
75.~.~ Volatizing {1}
76  DF  .~.~.~> Titanium, zirconium, or hafnium {3}


DEFINITION

Classification: 423/75

(under subclass 69) Processes which include the step of causing a normally solid or liquid substance in either elemental or compound form to be changed into a gas or vapor; see Glossary.

SEE OR SEARCH CLASS

203, Distillation: Processes, Separatory, appropriate subclasses, especially

28+, for a process which includes a chemical reaction solely for the purpose of facilitating the isolation by distillation of a component of the original mixture. A process which includes vaporizing an impure mixture and then chemically treating the impure vapor to recover or separate therefrom a desired metal compound is classified in Class 423; see also reference to Class 203 in section III, Line and Search Notes.