US PATENT SUBCLASS 209 / 22
.~.~ Coincident

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.~.~ Coincident {4}
23  DF  .~.~.~> With deposition
24  DF  .~.~.~> Horizontal current {1}
26  DF  .~.~.~> Inclined current {1}
28  DF  .~.~.~> Vertical current {1}

DEFINITION

Classification: 209/22

(under subclass 21) Methods and apparatus in which the material to be separated is subjected simultaneously to sifting and gaseous suspension.

(1) Note. In the main the material is supported by the sifter while gaseous currents are sent through it to suspend and carry off the lighter components, but the subclass is not restricted thereto.

(2) Note. This is generic and receives such cases as do not permit assignment to subclasses indented thereunder. The gaseous suspension must be free, and there must be substantial conveyance of the suspended material to distinguish from stratification under the influence of the gas.

(3) Note. This subclass and those indented thereunder deal mostly with grain, flour, and minerals, but will also take other materials when the separations fall within the definitions.