US PATENT SUBCLASS 423 / 157.2
.~.~ Phosphate rock or ore

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.~.~ Phosphate rock or ore {1}
157.3  DF  .~.~.~> Acid treatment {1}

DEFINITION

Classification: 423/157.2

Phosphate rock or ore:

(under subclass 155) Processes wherein the initial mixture is a naturally formed aggregate material of earth in the form of rock or ore containing phosphate.