US PATENT SUBCLASS 71 / 62
.~.~ Silicon-containing

Current as of: June, 1999
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71 /   HD   CHEMISTRY: FERTILIZERS

1  DF  PROCESSES AND PRODUCTS {5}
31  DF  .~ Inorganic material {5}
62.~.~ Silicon-containing

DEFINITION

Classification: 71/62

(under subclass 31) Processes and products directed to the preparation of inorganic fertilizers containing Si values; slags not provided for above are herein classified.