US PATENT SUBCLASS 423 / 351
NITROGEN OR COMPOUND THEREOF (EXCEPT AMMONIUM SALT OF NON-NITROGEN ACID)

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

351NITROGEN OR COMPOUND THEREOF (EXCEPT AMMONIUM SALT OF NON-NITROGEN ACID) {5}
352  DF  .~> Ammonia or ammonium hydroxide {6}
364  DF  .~> Carbon containing {7}
385  DF  .~> Oxygen containing {4}
406  DF  .~> Binary compound {2}
413  DF  .~> Hydrogen containing (e.g., amide, imide, etc.)

DEFINITION

Classification: 423/351

(under the class definition) Products or processes in which the product is nitrogen or a compound thereof, limited as follows: where the compound is an ammonium (NH4+) salt, the anion must contain a nitrogen atom.

(1) Note. Ammonium hydroxide (NH4OH) is included under this definition.

SEE OR SEARCH THIS CLASS, SUBCLASS:

217, for the process of separating or obtaining nitrogen from atmospheric air where it is the intent to separate components of or purify the air.

SEE OR SEARCH CLASS

588, Hazardous or Toxic Waste Destruction or Containment, appropriate subclasses for the destruction or containment of hazardous or toxic waste containing nitrogen, oxygen, halogen, and metals.