US PATENT SUBCLASS 210 / 275
.~.~ Backwash or blowback means

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

263  DF  PARTICULATE MATERIAL TYPE SEPARATOR, E.G., ION EXCHANGE OR SAND BED {13}
269  DF  .~ With rehabilitation means {6}
275.~.~ Backwash or blowback means {3}
276  DF  .~.~.~> With mechanical agitator or residue remover
277  DF  .~.~.~> Flow controller external of closed casing {1}
279  DF  .~.~.~> With embedded fluid distributor

DEFINITION

Classification: 210/275

(under subclass 269) Apparatus including means for passing a fluid through the medium in a direction of flow during separation.

SEE OR SEARCH THIS CLASS, SUBCLASS:

411, 425 and 427, for similar apparatus in another type of filter.