US PATENT SUBCLASS 209 / 166
.~.~.~.~.~.~ With modifying agents

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}
166.~.~.~.~.~.~ With modifying agents {1}
167  DF  .~.~.~.~.~.~.~> Preferential

DEFINITION

Classification: 209/166

(under subclass 164) Processes of bubble flotation of some constituents of a mixture, but not others, in which some reagent is employed to modify the factors in the flotation.

(1) Note. The modification may be of surfaces of components, as by coating or adsorption of the reagent, by variation of the surface tension of the liquid in which the separation is performed, or by modifying the nature of the bubbles, or of any combination of such factors. Mere chemical alteration of the surfaces of components does not bring the case into this subclass unless there is associated therewith the use of some reagent having a function such as indicated above.

SEE OR SEARCH CLASS

127, Sugar, Starch, and Carbohydrates, for the manufacture of sugar, starch or carbohydrates from natural sources.

162, Paper Making and Fiber Liberation,

1+, for processes of chemical liberation, recovery or purification of natural cellulose or fibrous material. 204, Chemistry: Electrical and Wave Energy, for liquid purification including the use of electrical or wave energy.

210, Liquid Purification or Separation,

703+, for processes involving flotation wherein the solids are floated indiscriminately, and subclasses 220+ for related apparatus.

252, Compositions,

61, for reagents employed in flotation.

261, Gas and Liquid Contact Apparatus, appropriate subclasses, for means for effecting gas and liquid contact, per se.

366, Agitating, for method and apparatus for mixing gases and liquids by agitation.

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.