US PATENT SUBCLASS 71 / 46
.~.~.~.~.~ Alkali metal values
Current as of:
June, 1999
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71 /
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CHEMISTRY: FERTILIZERS
1
DF
PROCESSES AND PRODUCTS
{5}
31
DF
.~ Inorganic material {5}
32
DF
.~.~ Phosphorus-containing {1}
33
DF
.~.~.~ Phosphates {6}
44
DF
.~.~.~.~ Heat-treatment {3}
46
.~.~.~.~.~ Alkali metal values
DEFINITION
Classification: 71/46
(under subclass 45) Processes wherein Si values are not present.