US PATENT SUBCLASS 210 / 277
.~.~.~ Flow controller external of closed casing

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

263  DF  PARTICULATE MATERIAL TYPE SEPARATOR, E.G., ION EXCHANGE OR SAND BED {13}
269  DF  .~ With rehabilitation means {6}
275  DF  .~.~ Backwash or blowback means {3}
277.~.~.~ Flow controller external of closed casing {1}
278  DF  .~.~.~.~> Multi-way valve unit

DEFINITION

Classification: 210/277

(under subclass 275) Apparatus in which flow of fluid is controlled by a flow controller external of the casing.

SEE OR SEARCH THIS CLASS, SUBCLASS:

190, for external supply for regenerating medium combinations.

418+, for a filter with a flow controller.