US PATENT SUBCLASS 210 / 333.01
.~.~.~ Backwash or blowback

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.~.~.~ Backwash or blowback {1}
333.1  DF  .~.~.~.~> Sequential backwash

DEFINITION

Classification: 210/333.01

Backwash of blowback:

(under subclass 332) Apparatus having means for causing a reverse flow through the filter medium that is out of service.