US PATENT SUBCLASS 71 / 35
.~.~.~.~.~ Nitrogen-containing

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

DEFINITION

Classification: 71/35

(under subclass 34) Processes, which also include inorganic N containing values, other than NH4.