US PATENT SUBCLASS 209 / 30
.~.~ Successive

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.~.~ Successive {4}
31  DF  .~.~.~> With deposition
32  DF  .~.~.~> Horizontal current {1}
34  DF  .~.~.~> Inclined current {1}
36  DF  .~.~.~> Vertical current {1}

DEFINITION

Classification: 209/30

(under subclass 21) Methods and apparatus employing both suspension by gas and sifting to segregate components of mixtures into grades of like characteristics, the two separations being sequential.

SEE OR SEARCH THIS CLASS, SUBCLASS:

19, and 20, for other combined separations including gaseous suspension.