US PATENT SUBCLASS 210 / 425
.~.~.~.~ 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}
424  DF  .~.~.~ Multi-way valve {1}
425.~.~.~.~ Backwash {1}
426  DF  .~.~.~.~.~> Encased

DEFINITION

Classification: 210/425

(under subclass 424) Apparatus to control backwash.

SEE OR SEARCH THIS CLASS, SUBCLASS:

278+, for a multiway valve unit controlling backwash in a particulate material type separator.