US PATENT SUBCLASS 454 / 207
.~.~ With specific filtering means

Current as of: June, 1999
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454 /   HD   VENTILATION

196  DF  MEANS COMBINED WITH WINDOW {12}
200  DF  .~ With air pump {5}
207.~.~ With specific filtering means

DEFINITION

Classification: 454/207

With specific filtering means:

(under subclass 200) Subject matter wherein particular significance is attributed to a means for removing solids or other impurities from the air.

SEE OR SEARCH THIS CLASS, SUBCLASS:

156+, particularly subclass 158 for porous filters used to filter out solid particles in a vehicle inlet airway.

201+, for window ventilation having means for lowering the temperature of the air combined with filtering means.

SEE OR SEARCH CLASS

96, Gas Separation: Apparatus, appropriate subclasses for means for removing dust and other contaminants from air, per se.