US PATENT SUBCLASS 71 / 61
.~.~ Alkali metal or ammonium

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

1  DF  PROCESSES AND PRODUCTS {5}
31  DF  .~ Inorganic material {5}
61.~.~ Alkali metal or ammonium

DEFINITION

Classification: 71/61

(under subclass 31) Processes and products directed to the preparation of inorganic fertilizers containing alkali metal or ammonium values.