US PATENT SUBCLASS 209 / 727
.~.~.~.~ Including oppositely directed axial flows around evacuated core (e.g., hydrocyclone having reverse free-vortexes formed, 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.~.~.~.~ Including oppositely directed axial flows around evacuated core (e.g., hydrocyclone having reverse free-vortexes formed, etc.) {5}
728  DF  .~.~.~.~.~> Plural individual interconnected, oppositely directed axial flow producing separation phases (e.g., system arrangements, multiple hydrocyclones, etc.) {1}
730  DF  .~.~.~.~.~> Including auxiliary fluid (e.g., air or gas core, dilution water, elutriation liquid, etc.) {1}
732  DF  .~.~.~.~.~> Including specific overflow discharge feature (e.g., adjustable vortex finder, shape, size, etc.)
733  DF  .~.~.~.~.~> Including specific underflow discharge feature (e.g., apex construction, secondary vortex chamber, etc.)
734  DF  .~.~.~.~.~> Including specific inlet feature (e.g., shape, size, etc.)

DEFINITION

Classification: 209/727

Including oppositely directed axial flows around evacuated core (e.g., hydrocyclone having reverse free-vortexes formed, etc.):

(under subclass 725) Methods and apparatus wherein the liquid suspension of material circulation creates coaxial, counter traveling spiral currents about a reduced pressure or vacuum central region.

(1) Note. A named hydrocyclone exhibiting the required coaxial, counter traveling spiral currents is appropriate for classification in this subclass.

(2) Note. A named hydrocyclone producing only a single vortex is classified in subclass 725.

SEE OR SEARCH THIS CLASS, SUBCLASS:

715, for analogous subject matter involving a gaseous suspension of material. See (1) Note in Class 209 subclass 155.

SEE OR SEARCH CLASS

55, Gas Separation, 434+, for apparatus for analogous subject matter for the indiscriminate removal of solids from a gaseous suspension. See (3) Note in Class 209 subclass 132.

95, Gas Separation: Processes, appropriate subclasses, for analogous methods for indiscriminate removal of solids from gaseous suspension. See (3) Note in Class 209

132,.

210, Liquid Purification or Separation,

787+, for processes and subclasses 512.1+ for apparatus employing cyclonic or centrifugal force effects for indiscriminately removing solids from a liquid suspension. See (3) Note in Class 209 subclass 132.