US PATENT SUBCLASS 71 / 31
.~ Inorganic material

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

1  DF  PROCESSES AND PRODUCTS {5}
31.~ Inorganic material {5}
32  DF  .~.~> Phosphorus-containing {1}
54  DF  .~.~> Nitrogen-containing (except ammonium) {2}
61  DF  .~.~> Alkali metal or ammonium
62  DF  .~.~> Silicon-containing
63  DF  .~.~> Carbonates, oxides, sulfates, halides, etc.

DEFINITION

Classification: 71/31

Methods of making fertilizer containing only inorganic materials and the corresponding products, when not provided for in any of the indented subclasses.