US PATENT SUBCLASS 210 / 430
.~.~.~ Filter surrounds valve

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}
429  DF  .~.~ Filter coaxial with valve seat or valve stem {2}
430.~.~.~ Filter surrounds valve

DEFINITION

Classification: 210/430

(under subclass 429) Appartus in which the filter surrounds the controller seat or head.

SEE OR SEARCH THIS CLASS, SUBCLASS:

371, for a centrifugal basket having valve means coacting with the bottom of the basket.

426, for a multiway valve unit encased in a filter housing for controlling cleaning by a backwash fluid.