US PATENT SUBCLASS 210 / 411
.~.~.~ Backwash or blowback

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  DF  .~.~ Fluid cleaning {2}
411.~.~.~ Backwash or blowback {1}
412  DF  .~.~.~.~> Liquid pulsator

DEFINITION

Classification: 210/411

(under subclass 409) Apparatus having means to pass a fluid, usually a liquid, through the filter medium in a direction reverse to normal filtering flow.

SEE OR SEARCH THIS CLASS, SUBCLASS:

427, for a flow controller for backwash and see the search

notes thereunder.

678, 793, and 798, for processes of rehabilitating a separation medium by reverse flow.