US PATENT SUBCLASS 209 / 731
.~.~.~.~.~.~ Adjacent or subsequent to underflow discharge (e.g., dilution water, elutriation liquid, sedimentation chamber, sump, etc.)

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

132  DF  FLUID SUSPENSION {2}
155  DF  .~ Liquid {5}
208  DF  .~.~ Grading deposition {4}
725  DF  .~.~.~ Rotational hydrodynamic extraction (e.g., unidirectional hydrocyclone, vortical, whirlpool, etc.) {2}
727  DF  .~.~.~.~ Including oppositely directed axial flows around evacuated core (e.g., hydrocyclone having reverse free-vortexes formed, etc.) {5}
730  DF  .~.~.~.~.~ Including auxiliary fluid (e.g., air or gas core, dilution water, elutriation liquid, etc.) {1}
731.~.~.~.~.~.~ Adjacent or subsequent to underflow discharge (e.g., dilution water, elutriation liquid, sedimentation chamber, sump, etc.)

DEFINITION

Classification: 209/731

Adjacent or subsequent to underflow discharge (e.g., dilution water, elutriation liquid, sedimentation chamber, sump, etc.):

(under subclass 730) Methods and apparatus wherein the secondary fluid acts upon heavier or larger material carried in an outer spiraling current.

SEE OR SEARCH THIS CLASS, SUBCLASS:

733, for particular underflow discharge features without the introduction of secondary fluid. See (2) Note therein.