US PATENT SUBCLASS 204 / 665
.~.~ With filter (e.g., electrostatic filter, etc.)

Current as of: June, 1999
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204 /   HD   CHEMISTRY: ELECTRICAL AND WAVE ENERGY

193  DF  APPARATUS {5}
660  DF  .~ Apparatus for electrical (including simultaneous electrical and magnetic) separation or purification of liquid or magnetic treatment of liquid (other than separation) {10}
665.~.~ With filter (e.g., electrostatic filter, etc.)

DEFINITION

Classification: 204/665

With filter (e.g., electrostatic filter, etc.):

(under subclass 660) Apparatus in which a foraminous or porous mass (e.g., electrostatic filter, etc.) is used to physically trap one or more constituents while allowing the remaining liquid to pass therethrough.

(1) Note. A filter for this subclass may also be electrically charged (i.e., as an electrode) to preferentially attract one or more constituents in the liquid under treatment, provided that physical entrapment also occurs at the filter.

SEE OR SEARCH THIS CLASS, SUBCLASS:

562, and 571, for similar processes.

674, for electrical separation apparatus having a porous, perforated, or grid electrode.