US PATENT SUBCLASS 210 / 681
.~.~ Removing ions

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}
681.~.~ Removing ions {4}
682  DF  .~.~.~> Radioactive
683  DF  .~.~.~> Anions {2}
687  DF  .~.~.~> Calcium or magnesium (e.g., hardness, water softening, etc.)
688  DF  .~.~.~> Heavy metal

DEFINITION

Classification: 210/681

Removing ions:

(under subclass 660) Process in which a constituent removed comprises a dissociated charged chemical moiety.