US PATENT SUBCLASS 423 / 390.1
.~.~.~ Nitric acid

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.~.~.~ Nitric acid {4}
391  DF  .~.~.~.~> By reacting a salt and an acid
392  DF  .~.~.~.~> Utilizing ammonia as reactant
393  DF  .~.~.~.~> Utilizing nitrogen oxide as reactant {1}
394.2  DF  .~.~.~.~> Purification or recovery

DEFINITION

Classification: 423/390.1

Nitric acid:

(under subclass 387) Products and processes in which the product is nitric acid; i.e., HNO3.

SEE OR SEARCH THIS CLASS, SUBCLASS:

400, for processes for the production of nitrogen oxides, per se.