US PATENT SUBCLASS 204 / 517
.~.~.~.~ Ion selective

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  DF  .~.~.~ Barrier separation (e.g., using membrane, filter paper, etc.) {1}
517.~.~.~.~ Ion selective

DEFINITION

Classification: 204/517

Ion selective:

(under subclass 516) Process in which the barrier distinguishes between ions of different charges to effect separation.

(1) Note. Methods which distinguish between ions having different levels of positive or negative charge are included here as well as those distinguishing between positive and negative charges.

(2) Note. Use of ion exchange membranes to effect separation is included in this group.

SEE OR SEARCH THIS CLASS, SUBCLASS:

520+, for electrophoretic or electro-osmotic ion selective barrier separation of other materials.