US PATENT SUBCLASS 210 / 431
.~.~.~ Filter fixed to valve seat, opposed to valve head

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}
431.~.~.~ Filter fixed to valve seat, opposed to valve head

DEFINITION

Classification: 210/431

(under subclass 429) Apparatus in which the filter is fixed to the controller seat opposite the controller head.