US PATENT SUBCLASS 204 / 638
.~.~.~.~ 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}
630  DF  .~.~.~ Ion selective {5}
638.~.~.~.~ With foraminous or perforated membrane support or spacer (e.g., screen, perforated plate, fabric, etc.)

DEFINITION

Classification: 204/638

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

(under subclass 630) 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.

639, for a nonion selective barrier separator with a foraminous or perforated membrane support or spacer.