US PATENT SUBCLASS 209 / 31
.~.~.~ With deposition

Current as of: June, 1999
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209 /   HD   CLASSIFYING, SEPARATING, AND ASSORTING SOLIDS

12.1  DF  PLURAL, DIVERSE SEPARATING OPERATIONS {17}
21  DF  .~ Gaseous suspension and sifting {2}
30  DF  .~.~ Successive {4}
31.~.~.~ With deposition

DEFINITION

Classification: 209/31

(under subclass 30) Methods and apparatus for subjecting material to be separated successively to gaseous suspension and sifting, and collecting one or more of the components suspended by the gas.