US PATENT SUBCLASS 423 / 358
.~.~ From organic material containing nitrogen

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}
352  DF  .~ Ammonia or ammonium hydroxide {6}
358.~.~ From organic material containing nitrogen

DEFINITION

Classification: 423/358

(under subclass 352) Processes in which the product is made from a substance which contains nitrogen and is of organic structure.

(1) Note. The organic material is frequently a waste product or of undetermined constitution.

(2) Note. The reaction often is a steam hydrolysis.

(3) Note. See subclass 226 (1) Note for structural requirement of an organic material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

550, for processes wherein ammonia from waste gases is recovered as ammonium sulfate.