US PATENT SUBCLASS 204 / 640
.~.~.~ Cylindrical barrier (e.g., filter, membrane, etc.)

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

193  DF  APPARATUS {5}
600  DF  .~ Electrophoretic or electro-osmotic apparatus {11}
627  DF  .~.~ Barrier separator (e.g., electrodialyzer, etc.) {5}
640.~.~.~ Cylindrical barrier (e.g., filter, membrane, etc.)

DEFINITION

Classification: 204/640

Cylindrical barrier (e.g., filter, membrane, etc.):

(under subclass 627) Apparatus having a separation barrier (e.g., filter, membrane, etc.) in the form of a cylinder or annulus.