US PATENT SUBCLASS 55 / 327
.~.~.~ Filter is most upstream

Current as of: June, 1999
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55 /   HD   GAS SEPARATION

315  DF  PLURAL SERIAL BASICALLY DIVERSE SEPARATING MEDIA {3}
318  DF  .~ Plural stages in unitary casing {2}
320  DF  .~.~ Deflector and fibrous, filamentary, particulate solids, or cohesive sheet filter type {6}
327.~.~.~ Filter is most upstream

DEFINITION

Classification: 55/327

(under subclass 320) Apparatus in which the member first contacted with the fluid mixture in the housing or flow confining means is of the type which retains thereon or prevents passage therethrough of nongaseous particles.