US PATENT SUBCLASS 71 / 34
.~.~.~.~ Alkali metal and ammonium only

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}
34.~.~.~.~ Alkali metal and ammonium only {2}
35  DF  .~.~.~.~.~> Nitrogen-containing
36  DF  .~.~.~.~.~> Alkali metal- and ammonium-containing

DEFINITION

Classification: 71/34

(under subclass 33) Methods directed to the preparation of inorganic fertilizers containing alkali metal or ammonium phosphates as the only phosphates present.