US PATENT SUBCLASS 71 / 33
.~.~.~ Phosphates

Current as of: June, 1999
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71 /   HD   CHEMISTRY: FERTILIZERS

1  DF  PROCESSES AND PRODUCTS {5}
31  DF  .~ Inorganic material {5}
32  DF  .~.~ Phosphorus-containing {1}
33.~.~.~ Phosphates {6}
34  DF  .~.~.~.~> Alkali metal and ammonium only {2}
37  DF  .~.~.~.~> Acid treatment {4}
42  DF  .~.~.~.~> Alkaline treatment
43  DF  .~.~.~.~> Neutralization
44  DF  .~.~.~.~> Heat-treatment {3}
48  DF  .~.~.~.~> Products {4}

DEFINITION

Classification: 71/33

(under subclass 32) Methods directed to the preparation of inorganic fertilizers containing phosphates.

(1) Note. Subclasses 33-47 are primarily process subclasses

but include products corresponding thereto when such are claimed along with the processes, in which case the products are cross-referenced to subclass 48 and indented subclasses.