US PATENT SUBCLASS 454 / 158
.~.~.~ Porous filter

Current as of: June, 1999
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454 /   HD   VENTILATION

69  DF  VEHICLE (E.G., AUTOMOBILE, ETC.) {15}
143  DF  .~ Having inlet airway {7}
156  DF  .~.~ With air treatment means {3}
158.~.~.~ Porous filter

DEFINITION

Classification: 454/158

Porous filter:

(under subclass 156) Subject matter comprising a means containing a multitude of orifices which permit the passage therethrough of air but which resist the passage therethrough of solids or other impurities.