US PATENT SUBCLASS 210 / 338
.~.~.~.~ Concentric filter elements

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

322  DF  PLURAL DISTINCT SEPARATORS {1}
323.1  DF  .~ Filters {10}
335  DF  .~.~ In series for prefilt flow {3}
337  DF  .~.~.~ Nested units {1}
338.~.~.~.~ Concentric filter elements

DEFINITION

Classification: 210/338

(under subclass 337) Apparatus in which the nested units are concentric filter elements.