US PATENT SUBCLASS 71 / 45
.~.~.~.~.~ Alkali metal and silicon values

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}
44  DF  .~.~.~.~ Heat-treatment {3}
45.~.~.~.~.~ Alkali metal and silicon values

DEFINITION

Classification: 71/45

(under subclass 44) Processes wherein both alkali metal and silicon values are present at some stage of the process; other inorganic compounds may also be present. The preponderance of patents in this subclass apply the heat treatment in the presence of the alkali metal and silicon values.