US PATENT SUBCLASS 210 / 333.1
.~.~.~.~ Sequential backwash

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

322  DF  PLURAL DISTINCT SEPARATORS {1}
323.1  DF  .~ Filters {10}
332  DF  .~.~ With residue removal or liquid agitation {2}
333.01  DF  .~.~.~ Backwash or blowback {1}
333.1.~.~.~.~ Sequential backwash

DEFINITION

Classification: 210/333.1

Sequential backwash:

(under subclass 333.01) Apparatus having means to successively clean the filter units.