US PATENT SUBCLASS 423 / 507
.~.~ By reacting hydrogen halide or ammonium halide

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423 /   HD   CHEMISTRY OF INORGANIC COMPOUNDS

462  DF  HALOGEN OR COMPOUND THEREOF {10}
500  DF  .~ Elemental halogen {6}
507.~.~ By reacting hydrogen halide or ammonium halide

DEFINITION

Classification: 423/507

(under subclass 500) Processes in which a hydrogen halide or an ammonium halide is utilized as a reactant.

SEE OR SEARCH THIS CLASS, SUBCLASS:

502, for a process of preparing elemental halogen by catalytically reacting the hydrogen or ammonium halide.