US PATENT SUBCLASS 210 / 638
.~.~ Including ion exchange or other chemical reaction

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

600  DF  PROCESSES {14}
634  DF  .~ Liquid/liquid solvent or colloidal extraction or diffusing or passing through septum selective as to material of a component of liquid; such diffusing or passing being effected by other than only an ion exchange or sorption process {11}
638.~.~ Including ion exchange or other chemical reaction

DEFINITION

Classification: 210/638

Including ion exchange or other chemical reaction:

(under subclass 634) Process in which a constituent of the liquid takes up, gives away, or replaces a chemical moiety such that a different compound is formed.

(1) Note. A process in which a dissolved constituent, after having migrated into an extracting liquid or through a septum, is precipitated is classifiable here but a process in which precipitation is caused by addition of a second liquid without extractive solution, e.g., adding a halide solution to a silver salt solution to cause precipitation, is classifiable in subclass 702.

(2) Note. Adding a pH or surfactant agent is not considered to cause a chemical reaction and such a process is classifiable in subclass 639 infra.

SEE OR SEARCH THIS CLASS, SUBCLASS:

660, for an ion exchange process, per se.