US PATENT SUBCLASS 71 / 30
.~.~.~.~ With nitrogen-containing substances

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

1  DF  PROCESSES AND PRODUCTS {5}
11  DF  .~ Organic material-containing {6}
27  DF  .~.~ From synthetic material {1}
28  DF  .~.~.~ Urea and its derivatives {2}
30.~.~.~.~ With nitrogen-containing substances

DEFINITION

Classification: 71/30

(under subclass 28) Processes or products which include inorganic N containing substances, other than NH4, such as nitrates. Thus, fertilizers containing urea admixed with a nitrate and urea nitrate both belong in this subclass.