US PATENT SUBCLASS 210 / 677
.~.~.~ Using conserved or recirculated fluid

Current as of: June, 1999
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210 /   HD   LIQUID PURIFICATION OR SEPARATION

600  DF  PROCESSES {14}
660  DF  .~ Ion exchange or selective sorption {8}
670  DF  .~.~ Including rehabilitating or regenerating exchange material or sorbent {7}
677.~.~.~ Using conserved or recirculated fluid

DEFINITION

Classification: 210/677

Using conserved or recirculated fluid:

(under subclass 670) Process in which a liquid which has once been contacted with the separatory material is again contacted with the same or a different separatory material at a different step in the treating-regenerating cycle.

(1) Note. The second contacting must perform the restoration of separatory material and not further treat the liquid.

SEE OR SEARCH THIS CLASS, SUBCLASS:

194+, for separatory apparatus including means to recirculate a constituent.