US PATENT SUBCLASS 210 / 688
.~.~.~ Heavy metal

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  DF  .~.~ Removing ions {4}
688.~.~.~ Heavy metal

DEFINITION

Classification: 210/688

Heavy metal:

(under subclass 681) Process wherein the constituent is a positively charged ion of a metal whose specific gravity is greater than four.