US PATENT SUBCLASS 423 / 380
.~.~.~ Utilizing free nitrogen as reactant

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}
364  DF  .~ Carbon containing {7}
371  DF  .~.~ Ternary compound {4}
380.~.~.~ Utilizing free nitrogen as reactant {2}
381  DF  .~.~.~.~> And using catalyst
382  DF  .~.~.~.~> Utilizing carbon reactant from specified source

DEFINITION

Classification: 423/380

(under subclass 371) Processes including the use of elemental or free nitrogen in a reaction.

(1) Note. The presence of atompheric air in the reaction is not sufficient to classify a patent in this subclass, unless clearly disclosed as the source of nitrogen.

SEE OR SEARCH THIS CLASS, SUBCLASS:

374, for a process in which free or elemental nitrogen is used in the manufacture of hydrogen cyanide.