US PATENT SUBCLASS 210 / 778
.~.~.~ With or by addition to prefilt

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

600  DF  PROCESSES {14}
767  DF  .~ Separating {16}
777  DF  .~.~ Including precoating filter medium with filter aid {1}
778.~.~.~ With or by addition to prefilt

DEFINITION

Classification: 210/778

With or by addition or prefilt:

(under subclass 777) Process wherein the filter aid material is added to the influent before or during filtration.