US PATENT SUBCLASS 423 / 356
.~.~ From ammonium compound

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}
356.~.~ From ammonium compound {1}
357  DF  .~.~.~> Utilizing calcium compound

DEFINITION

Classification: 423/356

(under subclass 352) Processes in which the product is made from a compound containing the ammonium (NH4[supscrpt]+[end supscrpt]) radical.

(1) Note. The processes usually involve contact of the compound with steam.

(2) Note. The nitrogen in inorganic salts such as NH4Cl and (NH4[end subscrpt])2SO4[end subscrpt] is often referred to as "fixed nitrogen" in these patents.