US PATENT SUBCLASS 71 / 28
.~.~.~ Urea and its derivatives

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.~.~.~ Urea and its derivatives {2}
29  DF  .~.~.~.~> With phosphorus-containing substances
30  DF  .~.~.~.~> With nitrogen-containing substances

DEFINITION

Classification: 71/28

(under subclass 27) Processes in which the organic fertilizer contains urea or one of its derivatives, and corresponding products.