US PATENT SUBCLASS 209 / 28
.~.~.~ Vertical current

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}
22  DF  .~.~ Coincident {4}
28.~.~.~ Vertical current {1}
29  DF  .~.~.~.~> With deposition

DEFINITION

Classification: 209/28

(under subclass 22) Methods and apparatus in which there are coincident grading suspension and sifting, a vertical current of gas, generally air, being employed to effect the suspension.

SEE OR SEARCH THIS CLASS, SUBCLASS:

250, 276, 280, 295, 312, 318, and 321, for sifters employing a stream of gas for feeding material, or for agitation or conveying.