Patent ID: 6758884
Filing Date: 2004-07-06
Classification: B03C

Abstract:
A filtration system for filtering particulates from air flowing in an upstream to downstream direction in an air flow channel, comprising:a plurality of point ionization sources, each of said plurality of point ionization sources located in the proximity of the periphery of said air flow channel and being oriented to generate ions in the proximity of said air flow channel in a direction generally upstream from each respective one of said plurality of point ionization sources, said ions predominately having an electrical charge with respect to ground; a particulate collection surface positioned within said air flow channel in a downstream direction from said plurality of point ionization sources, said particulate collection surface being electret charged in an opposite direction with respect to ground than said electrical charge of said ions; an ion trap positioned within said air flow channel between said plurality of ionization sources and said particulate collection surface, said ion trap being relatively electrically neutral as compared with said particulate collection surface and said ions.