US PATENT SUBCLASS 210 / 490
.~.~.~.~ Integral or coated layers

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

348  DF  FILTER {25}
483  DF  .~ Supported, shaped or superimposed formed mediums {11}
488  DF  .~.~ Abutted or superimposed members {2}
489  DF  .~.~.~ For series flow {1}
490.~.~.~.~ Integral or coated layers {1}
491  DF  .~.~.~.~.~> All fibrous

DEFINITION

Classification: 210/490

(under subclass 489) Apparatus in which (1) the layers are integrally united as by an adhesive or one material is partially diffused into another, or (2) each layer comprises a coated or impregnated material.