US PATENT SUBCLASS 210 / 392
.~.~.~ Fixed position or attached valve blocking means

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}
392.~.~.~ Fixed position or attached valve blocking means

DEFINITION

Classification: 210/392

(under subclass 391) Apparatus having (1) a member fixed in position which contacts the filter medium or its support, or (2) a member actuating valves attached to a moving filter medium or its support; either (1) or (2) acting to block fluid flow through part of the moving filter medium.