US PATENT SUBCLASS 204 / 671
.~.~.~ Cylindrical or annular

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}
670  DF  .~.~ Concentric electrodes {1}
671.~.~.~ Cylindrical or annular

DEFINITION

Classification: 204/671

Cylindrical or annular:

(under subclass 670) Apparatus in which at least the overlapping portions of the concentric electrodes are cylindrical or annular in shape.