US PATENT SUBCLASS 71 / 41
.~.~.~.~.~ Acids of phosphorus

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}
41.~.~.~.~.~ Acids of phosphorus

DEFINITION

Classification: 71/41

(under subclass 37) Processes wherein the acid used is an acid of phosphorus.

SEE OR SEARCH THIS CLASS, SUBCLASS:

37, for an acid of phosphorus mixed with another acid, see this class.