US PATENT SUBCLASS 423 / 541.4
.~.~.~.~ Ammonium sulfate

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

511  DF  SULFUR OR COMPOUND THEREOF {4}
512.1  DF  .~ Oxygen containing {11}
539  DF  .~.~ Sulfur dioxide {4}
541.1  DF  .~.~.~ Utilizing metal sulfate as reactant {1}
541.4.~.~.~.~ Ammonium sulfate

DEFINITION

Classification: 423/541.4

Ammonium sulfate:

(under subclass 541.1) Processes which include the step of using sulfate of ammonium as a reactant.