US PATENT SUBCLASS 204 / 518
.~.~ 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}
518.~.~ Barrier separation (e.g., using membrane, filter paper, etc.) {5}
519  DF  .~.~.~> With control responsive to sensed condition
520  DF  .~.~.~> Ion selective {8}
542  DF  .~.~.~> Combined with diverse-type separation (e.g., electro-osmotic barrier separation combined with centrifugal separation, etc.)
543  DF  .~.~.~> Biological material prepared, recovered, or treated (e.g., urine, etc.)
544  DF  .~.~.~> Organic material prepared, recovered, or treated

DEFINITION

Classification: 204/518

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

(under subclass 450) 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 subclasses indented hereunder are not intended to provide for the mere use of a perforated electrode.

SEE OR SEARCH THIS CLASS, SUBCLASS:

516+, for electrophoretic or electro-osmotic barrier separation of inorganic siliceous or calcareous material.

627+, for corresponding apparatus.