US PATENT SUBCLASS 210 / 665
.~.~.~ By making an insoluble substance or accreting suspended constituents

Current as of: June, 1999
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210 /   HD   LIQUID PURIFICATION OR SEPARATION

600  DF  PROCESSES {14}
660  DF  .~ Ion exchange or selective sorption {8}
663  DF  .~.~ Including diverse separating or treating of liquid {4}
665.~.~.~ By making an insoluble substance or accreting suspended constituents {2}
666  DF  .~.~.~.~> Utilizing organic agent
667  DF  .~.~.~.~> Utilizing aluminum, calcium, or iron containing agent

DEFINITION

Classification: 210/665

By making an insoluable substance or accreting suspended constituents:

(under subclass 663) Process in which a liquid is treated by

a chemical or physical agent to cause a dissolved constituent to separate from the solvent or to cause a constituent, dispersed in such a finely divided state that it is not filterable or settleable, to agglomerate, coagulate, coalesce, or flocculate.

(1) Note. This subclass requires a positive step to cause the precipitation or accretion, and merely allowing suspended material to settle will not warrant classification here, but is provided for in subclass 663.

(2) Note. Precipitation may be either by chemical reaction, (e.g., of silver by addition of sodium chloride, by salting out or addition of alcohol to sugar solution, etc.) or by physical means as agitation, heat, etc.

(3) Note. A process using a single inorganic flocculant or precipitant is classified in this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

601, especially 626 and 631, for a process utilizing a living organism and in which flocculation may occur.

695, for a process utilizing magnetic energy and which may precipitate or flocculate material in a liquid. 702, for a liquid purification or separation process using precipitation or flocculation, per se.

800+, for a process of separation including only settling of suspended material.

SEE OR SEARCH CLASS

23, Chemistry: Physical Processes,

295+, and 313+ for physical processes of crystallizing or agglomerating a specific nonmetallic element or an inorganic compound.

117, Single-Crystal, Oriented-Crystal, and Epitaxy Growth Processes; Non-Coating Apparatus Therefor, for processes and non-coating apparatus for growing therein-defined single-crystal of all types of materials, including inorganic or organic.

260, Chemistry of Carbon Compounds, appropriate subclasses, and

701+, and 704+ for a process of obtaining or purifying a specific organic compound.

423, Chemistry of Inorganic Compounds, appropriate subclasses for a chemical process of crystallizing a specific nonmetallic element or an inorganic compound.