US PATENT SUBCLASS 209 / 425
.~.~.~.~ Pulsating current

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

422  DF  STRATIFIERS {6}
*  DD  .~ With liquid treatment {3}
*  DD  .~.~ Movable bed {3}
*  DD  .~.~.~ Permeable {2}
425.~.~.~.~ Pulsating current {2}
426  DF  .~.~.~.~.~> Divergent or opposite travel
427  DF  .~.~.~.~.~> Parallel travel

DEFINITION

Classification: 209/425

(under subclass 422) Devices and methods in which a pulsating or interrupted flow of liquid is sent through a permeable or perforated support and through material thereon to agitate

the material in such manner that the constituents are arranged in strata with the heaviest in the lowest stratum, or the heaviest is formed into a stratum and the lightest carried away by the liquid.

(1) Note. This subclass takes such processes and apparatus as are not classifiable in the indented subclasses, generally cases in which there is no definite horizontal movement of the heaviest material.