US PATENT SUBCLASS 204 / 516
.~.~.~ Barrier separation (e.g., using membrane, filter paper, etc.)

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

*  DD  PROCESSES AND PRODUCTS {7}
450  DF  .~ Electrophoresis or electro-osmosis processes and electrolyte compositions therefor when not provided for elsewhere {14}
515  DF  .~.~ Inorganic siliceous or calcareous material prepared, separated, or treated (e.g., clay, earth, concrete, asbestos, glass, etc.) {1}
516.~.~.~ Barrier separation (e.g., using membrane, filter paper, etc.) {1}
517  DF  .~.~.~.~> Ion selective

DEFINITION

Classification: 204/516

Barrier separation (e.g., using membrane, filter paper, etc.):

(under subclass 515) Process in which a barrier (e.g., membrane, filter paper, etc.) is used to separate some ions or particles from other ions or particles by allowing some ions or particles to pass through the barrier while the others are retained at or stopped from passing through the barrier.

(1) Note. This subclass and the subclass indented hereunder are not intended to provide for the mere use of a perforated electrode.

SEE OR SEARCH THIS CLASS, SUBCLASS:

518+, for electrophoretic or electro-osmotic barrier separation of other materials.