US PATENT SUBCLASS 210 / 427
.~.~.~ Backwash

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

348  DF  FILTER {25}
418  DF  .~ With flow controller for material being treated {5}
420  DF  .~.~ Selective directive flow relative to filter {4}
427.~.~.~ Backwash

DEFINITION

Classification: 210/427

(under subclass 420) Apparatus to control backwash.

SEE OR SEARCH THIS CLASS, SUBCLASS:

108, for flow, fluid pressure or material level control of backwash.

190+, for external regenerating medium supply combinations.

425+, for control of backwash by a selective directive multiway valve controller.