US PATENT SUBCLASS 71 / 47
.~.~.~.~.~ Carbonates, oxides, sulfates, silicon, and halides

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  DF  .~.~.~ Phosphates {6}
44  DF  .~.~.~.~ Heat-treatment {3}
47.~.~.~.~.~ Carbonates, oxides, sulfates, silicon, and halides

DEFINITION

Classification: 71/47

(under subclass 44) Processes wherein carbonates, oxides, sulphates, halides or silicon values, one or more, are present at some stage of the process. As in the preceding heat treatment subclasses, the added values are ordinarily present during the heat treatment.