US PATENT SUBCLASS 204 / 639
.~.~.~ With foraminous or perforated membrane support or spacer (e.g., screen, perforated plate, fabric, 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}
639.~.~.~ With foraminous or perforated membrane support or spacer (e.g., screen, perforated plate, fabric, etc.)

DEFINITION

Classification: 204/639

With foraminous or perforated membrane support or spacer (e.g., screen, perforated plate, fabric, etc.):

(under subclass 627) Apparatus having a foraminous or perforated membrane support or spacer (e.g., screen, perforated plate, fabric, etc.).

SEE OR SEARCH THIS CLASS, SUBCLASS:

636, for an ion selective barrier separator with alternating

anion and cation selective membranes and a foraminous or perforated membrane support or spacer.

638, for an ion selective barrier separator with a foraminous or perforated membrane support or spacer but without both anion and cation selective membranes.