US PATENT SUBCLASS 209 / 165
.~.~.~.~.~.~ Preferential

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}
162  DF  .~.~ Floating {3}
163  DF  .~.~.~ Buoyant material {2}
*  DD  .~.~.~.~ Bubbles {2}
164  DF  .~.~.~.~.~ Processes {2}
165.~.~.~.~.~.~ Preferential

DEFINITION

Classification: 209/165

(under subclass 164) Processes by which certain components of a material are separated by bubble flotation from other components which are normally flotable, which processes do not involve the use of reagents which modify the physical characteristics of the liquid or bubbles.

(1) Note. This subclass will include processes in which the surfaces of one or more constituents are changed otherwise than by coating with a reagent or adsorption of the reagent and where no reagent is employed to modify the physical characteristics of the liquid or the bubbles by which the flotation is attained.

SEE OR SEARCH CLASS

516, Colloid Systems and Wetting Agents; Subcombinations Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,

10+, for foam colloid systems or agents for such systems or making or stabilizing such systems or agents, subclasses 115+ for compositions for or subcombination compositions for or breaking of or inhibiting of foam colloid systems; in each instance, when generically claimed or when there is no hierarchically superior provision in the USPC for the specifically claimed art.