US PATENT SUBCLASS 210 / 108
.~.~ Backwash or blowback

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

97  DF  FLOW, FLUID PRESSURE OR MATERIAL LEVEL, RESPONSIVE {14}
106  DF  .~ Filter cleaning {2}
108.~.~ Backwash or blowback

DEFINITION

Classification: 210/108

(under subclass 106) Apparatus comprising backwash or blowback means.

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420+, for a filter provided with a flow controller providing selective direction flow therethrough.