US PATENT SUBCLASS 423 / 394.2
.~.~.~.~ Purification or recovery


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

351  DF  NITROGEN OR COMPOUND THEREOF (EXCEPT AMMONIUM SALT OF NON-NITROGEN ACID) {5}
385  DF  .~ Oxygen containing {4}
387  DF  .~.~ Hydrogen containing {2}
390.1  DF  .~.~.~ Nitric acid {4}
394.2.~.~.~.~ Purification or recovery


DEFINITION

Classification: 423/394.2

Purification or recovery:

(under subclass 390.1) Processes wherein the nitric acid is separated from impurities or undesired foreign matter.