US PATENT SUBCLASS 71 / 54
.~.~ Nitrogen-containing (except 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}
54.~.~ Nitrogen-containing (except ammonium) {2}
55  DF  .~.~.~> Cyanamide {2}
58  DF  .~.~.~> Nitrates {2}

DEFINITION

Classification: 71/54

(under subclass 31) Methods directed to the preparation of inorganic fertilizers containing N values other than or in addition to NH4 and products corresponding to these methods.