B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
B01D 46/10 (2006.01) A41D 13/11 (2006.01) A62B 23/02 (2006.01) B01D 39/08 (2006.01) B01D 39/16 (2006.01) B03C 3/28 (2006.01)
Patent
CA 2123545
The present-invention is an air filter assembly which includes a frame having a filter mounted therein. The filter is constructed of woven microfilament strands having a cross- sectional height of at most 30 microns, the strands being spaced apart by at most 20 microns. The filter medium is single-ply so as to be non-entraining. Each strand preferably has a smooth outer surface for repelling particles smaller than the size of the openings in the filter. The frame may laterally adjustable, if desired. In an alternative embodiment, the filter includes a single-ply sheet of a filtering material having openings cut therein. The filtering material preferably has a smooth outer surface facing the air-flow for preventing the particles from clogging the filter. The openings may be made in the filtering material by processes such as laser cutting, x-ray lithography, chemical etching, or by stretching a microporous sheet. The percentage of the filter surface area that is open to air flow is sufficient to enable air flow without the use of mechanical blowing means.
Gowling Lafleur Henderson Llp
Wolfe Michael
LandOfFree
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