US PATENT SUBCLASS 55 / 518
.~.~.~ Between perforated plates

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

490  DF  WITH MEANS SECURING OR RETAINING SEPARATING MEDIA {7}
512  DF  .~ Discrete fibrous or particulate solids {4}
516  DF  .~.~ Held between openwork {3}
518.~.~.~ Between perforated plates

DEFINITION

Classification: 55/518

(under subclass 516) Apparatus in which the filter media is retained between continuous surfaces, each having at least one aperture formed therethrough.