US PATENT SUBCLASS 210 / 618
.~.~.~.~.~ And rehabilitating or regenerating same

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  DF  .~.~.~.~ In bed form {1}
618.~.~.~.~.~ And rehabilitating or regenerating same

DEFINITION

Classification: 210/618

And rehabilitating or regenerating same:

(under subclass 617) Process wherein the particulate media is restored to the condition in which it was before the

treatment process.

SEE OR SEARCH THIS CLASS, SUBCLASS:

791+, for a process of rehabilitating or regenerating a similar particulate bed used for filtering.