US PATENT SUBCLASS 210 / 393
.~.~.~ Backwash or blowback and additional cleaner

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

348  DF  FILTER {25}
359  DF  .~ Movable medium {12}
391  DF  .~.~ With cleaning means {5}
393.~.~.~ Backwash or blowback and additional cleaner

DEFINITION

Classification: 210/393

(under subclass 391) Apparatus having blowback or backwash cleaning means and another cleaning means, e.g., scraper or brush.