US PATENT SUBCLASS 71 / 39
.~.~.~.~.~ Nitric and hydrochloric

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}
37  DF  .~.~.~.~ Acid treatment {4}
39.~.~.~.~.~ Nitric and hydrochloric

DEFINITION

Classification: 71/39

(under subclass 37) Processes wherein the acid supplied is HNO3 or HCl mixed in the liquid state.

SEE OR SEARCH THIS CLASS, SUBCLASS:

37, for HNO3 or HCl mixed with another acid.