US PATENT SUBCLASS 423 / 157.4
.~.~.~.~ Sulfating

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

1  DF  TREATING MIXTURE TO OBTAIN METAL CONTAINING COMPOUND {15}
155  DF  .~ Alkaline earth metal (Mg, Ca, Sr, or Ba) {11}
157.2  DF  .~.~ Phosphate rock or ore {1}
157.3  DF  .~.~.~ Acid treatment {1}
157.4.~.~.~.~ Sulfating

DEFINITION

Classification: 423/157.4

Sulfating:

(under subclass 157.3) Processes in which the treatment includes the step of chemically forming a compound containing the sulfate, (SO4)[supscrpt]-2[end supscrpt], radical.

(1) Note. Included in this subclass are treatments with materials such as sulfuric acid and (SO4[end subscrpt])[supscrpt]-2[end supscrpt] salts.