US PATENT SUBCLASS 210 / 409
.~.~ Fluid cleaning

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

348  DF  FILTER {25}
407  DF  .~ With residue removing means or agitation of liquid {3}
409.~.~ Fluid cleaning {2}
410  DF  .~.~.~> Air pump type
411  DF  .~.~.~> Backwash or blowback {1}

DEFINITION

Classification: 210/409

(under subclass 407) Apparatus having (1) means to add a fluid to or trap a fluid within the filter unit for cleaning purposes or (2) constructed to backwash the filter medium.

SEE OR SEARCH THIS CLASS, SUBCLASS:

433, for a bypass around a filter including those whereby a filter is cleaned by prefilt flow.