US PATENT SUBCLASS 71 / 63
.~.~ Carbonates, oxides, sulfates, halides, etc.

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

1  DF  PROCESSES AND PRODUCTS {5}
31  DF  .~ Inorganic material {5}
63.~.~ Carbonates, oxides, sulfates, halides, etc.

DEFINITION

Classification: 71/63

(under subclass 31) Processes and products directed to the preparation of inorganic fertilizers containing carbonates, oxides, sulphates or halides; shells, such as oyster shells,

are herein classified.