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US 5,238,474 AGranted
Filtration arrangement
AssigneeDonaldson Company, Inc.
InventorsBrad E. Kahlbaugh, Susan B. Reinhart, Denis J. Dudrey, John T. Herman
Life of this patent
Estimating the term…
Abstract
Constructions and methods are described for collecting particulate material from gas streams. In one specifically described arrangement, a region of depth media is oriented upstream of a second region of depth media. A surface loading media is positioned downstream from the second region of depth media. In an alternate embodiment, a further region of filter media is positioned downstream from the surface loading media.
Claims16
A filter construction comprising:
- (a) a first, most upstream, region of depth media having a percent solidity of no greater than about 2% and being constructed and arranged to remove at least about 60% by weight of particulates within the size range of about 1 microns to about 10 microns, carried by an airstream which passes into said filter construction during use;
- (b) a second region of depth media positioned downstream from said first region of depth media;
- said second region of depth media being constructed and arranged to entrap at least 60%, by weight, of any particulates within a size range of about 1 micron to about 10 micron, which pass through the first region of depth media during use;
- and,
- (c) an oiled pleated paper filter positioned downstream of said second region of depth media.
2 more elements
A filter construction according to claim 11 including a third region of depth media;
- said third region of depth media being positioned downstream from said oiled pleated paper filter.
A filter construction comprising:
- (a) a first region of depth media constructed and arranged to remove at least about 60%, by weight, of particulates within a size range of about 1 micrometer to about 10 micrometers which are carried by an airstream that passes into said filter construction, during use;
- (b) a second region of depth media positioned downstream from said first region of depth media;
- said second region of depth media being constructed and arranged to entrap at least 60%, by weight, of any particulates within a size range of about 1 micron to about 10 microns, which pass through the first region of depth media during use;
- and,
- (c) an oiled pleated paper filter positioned downstream of said second region of depth media.
2 more elements
Dependencies are inferred from the claim text.