US PATENT SUBCLASS 210 / 617
.~.~.~.~ In bed form

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

600  DF  PROCESSES {14}
601  DF  .~ Treatment by living organism {13}
615  DF  .~.~ Utilizing contact surfaces supporting microorganism (e.g., trickling filter, etc.) {2}
616  DF  .~.~.~ Particulate media {1}
617.~.~.~.~ In bed form {1}
618  DF  .~.~.~.~.~> And rehabilitating or regenerating same

DEFINITION

Classification: 210/617

In bed form:

(under subclass 616) Process wherein the particulate media is relatively closely packed in a dense mass rather than being dispersed through the liquid.