US PATENT SUBCLASS 204 / 635
.~.~.~.~.~.~ Tortuous path-type frame or membrane spacer

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}
633  DF  .~.~.~.~ Both anion and cation selective membranes {1}
634  DF  .~.~.~.~.~ Alternating anion and cation selective membranes {2}
635.~.~.~.~.~.~ Tortuous path-type frame or membrane spacer

DEFINITION

Classification: 204/635

Tortuous path-type frame or membrane spacer:

(under subclass 634) Apparatus having a frame or spacer configured to direct liquid in a tortuous flow path (e.g., zig-zag, twisted, back and forth, etc.).