US PATENT SUBCLASS 210 / 439
.~.~.~.~ Axial flow through filter element

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

348  DF  FILTER {25}
435  DF  .~ Within flow line or flow line connected close casing {9}
437  DF  .~.~ Central internal liquid receiver, e.g., tube {3}
438  DF  .~.~.~ Imperforate central liquid tube {1}
439.~.~.~.~ Axial flow through filter element

DEFINITION

Classification: 210/439

(under subclass 438) Apparatus in which the liquid to be treated flows through the imperforate tube in one direction and through the filter medium, for treating purposes, in a direction opposite to the first mentioned direction of flow.

SEE OR SEARCH THIS CLASS, SUBCLASS:

288, for a particulate material type separator having similar structure.