US PATENT SUBCLASS 210 / 410
.~.~.~ Air pump type

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

348  DF  FILTER {25}
407  DF  .~ With residue removing means or agitation of liquid {3}
409  DF  .~.~ Fluid cleaning {2}
410.~.~.~ Air pump type

DEFINITION

Classification: 210/410

(under subclass 409) Apparatus in which a fluid is trapped within the filter, which fluid, upon a release of pressure or cessation of normal flow, acts to force itself or a portion of the filtrate through the filter medium or acts to discharge trapped residue.