US5800587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration arrangement and method
Assignee: Donaldson Co Inc
•
Filing: 1997-02-12
•
Granted: 1998-09-01
•
Expires: 2017-02-12
Abstract
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.
Inventors
- 👤 Brad E. Kahlbaugh
- 👤 Susan B. Reinhart
- 👤 Denis J. Dudrey
- 👤 John T. Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:53
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D46/00; B01D46/56; B01D46/62; B01D46/64; B01D39/16; B01D39/1607; B01D39/1623; B01D39/18; B01D46/24; B01D46/2403; B01D46/2411; B01D46/52; B01D46/521; F; F02; F02M; F02M35/00; F02M35/02; F02M35/024; B01D2267/00; B01D2267/40; B01D2275/00; B01D2275/10; B01D2275/20; B01D2275/208; B01D2279/00; B01D2279/60
Claims Analysis
Total Claims: 46
Claim 1
Independent Claim
216 words
A filter construction comprising: (a) first and second end caps; each of said first and second end caps comprising polyurethane foam; (i) said first end cap having a central air flow exit aperture therein; (ii) said second end cap comprising a closed end cap having no central aperture therein; (b) a cylindrical inner liner embedded in, and extending between, said first and second end caps; (c) a cylindrical outer liner embedded in, and extending between, said first and second end caps; and, (d) a cylindrical filter media arrangement positioned between said inner liner and said outer liner; said cylindrical filter media arrangement extending between said first and second end caps; said filter media arrangement including: (i) a first region of fibrous depth media comprising fibers and having a first average percent solidity, within the construction, of no greater than about 3%; and, (ii) a second region of fibrous depth media positioned immediately downstream from said first region of fibrous depth media; said second region of fibrous depth media comprising fibers and having a second average percent solidity, within the construction, different from said first average percent solidity in said first region; (e) said filter construction being constructed and arranged for filtering air flow, during use, from an upstream, outermost, side through to a downstream, inner, side.
Claim 2
Dependent Claim
216 words
A filter construction comprising: (a) first and second end caps; each of said first and second end caps comprising polyurethane foam; (i) said first end cap having a central air flow exit aperture therein; (ii) said second end cap comprising a closed end cap having no central aperture therein; (b) a cylindrical inner liner embedded in, and extending between, said first and second end caps; (c) a cylindrical outer liner embedded in, and extending between, said first and second end caps; and, (d) a cylindrical filter media arrangement positioned between said inner liner and said outer liner; said cylindrical filter media arrangement extending between said first and second end caps; said filter media arrangement including: (i) a first region of fibrous depth media comprising fibers and having a first average percent solidity, within the construction, of no greater than about 3%; and, (ii) a second region of fibrous depth media positioned immediately downstream from said first region of fibrous depth media; said second region of fibrous depth media comprising fibers and having a second average percent solidity, within the construction, different from said first average percent solidity in said first region; (e) said filter construction being constructed and arranged for filtering air flow, during use, from an upstream, outermost, side through to a downstream, inner, side.
Claim 3
Dependent Claim
30 words
A filter construction according to claim 1 wherein: (a) said second average percent solidity in said second region is greater than said first average percent solidity of said first region.
Claim 4
Dependent Claim
24 words
A filter construction according to claim 2 wherein: (a) said first average percent solidity in said first region is no greater than about 2%.
Claim 5
Dependent Claim
36 words
A filter construction according to claim 3 wherein: (a) said first region of depth media has a thickness of at least 70% of the overall combined thickness of the first and second regions of depth media.
Claim 6
Dependent Claim
23 words
A filter construction according to claim 4 wherein: (a) said first region of depth media has a thickness of 2.5 to 3.5 cm.
Claim 7
Dependent Claim
23 words
A filter construction according to claim 5 wherein: (a) said second region of depth media has a thickness of 0.5 to 1.5 cm.
Claim 8
Dependent Claim
46 words
A filter construction according to claim 6 wherein: (a) said first region of depth media is constructed and arranged for operational loading therein of at least two times, by weight, the amount of operationally retained solids in all fibrous depth media downstream from said first region.
Claim 9
Dependent Claim
47 words
A filter construction according to claim 6 wherein: (a) said first region of fibrous depth media is constructed and arranged for operational loading therein of at least five times, by weight, the amount of operationally retained solids in all fibrous depth media downstream from said first region.
Claim 10
Dependent Claim
60 words
A filter construction according to claim 1 wherein: (a) said second region of fibrous depth media comprises at least two overlapping layers of media; (b) said first region of fibrous depth media comprises at least two overlapping layers of media; and (c) said first region of fibrous depth media is positioned adjacent to and in contact with said outer liner.
Claim 11
Dependent Claim
58 words
A filter construction according to claim 1 wherein: (a) said cylindrical filter media arrangement comprises a structure resulting from wrapping at least one layer of fibrous depth media of a first construction around at least one layer of fibrous depth media of a second construction; said second construction having a different average fiber diameter than said first construction.
Claim 12
Dependent Claim
23 words
A filter construction according to claim 1 including: (a) a cylindrical pleated paper media positioned downstream from said second region of depth media.
Claim 13
Dependent Claim
25 words
A filter construction according to claim 11 wherein: (a) said cylindrical pleated paper media is positioned immediately adjacent to said second region of depth media.
Claim 14
Dependent Claim
41 words
A filter construction according to claim 1 wherein: (a) said inner liner is a metal liner; (b) said outer liner is a metal liner; and (c) said first region of depth media is secured to said outer liner by an adhesive.
Claim 15
Dependent Claim
21 words
A filter construction according to claim 1 wherein: (a) said inner liner comprises plastic; and (b) said outer liner comprises plastic.
Claim 16
Dependent Claim
35 words
A filter construction according to claim 1 including: (a) a third region of fibrous depth media positioned upstream from said outer liner; said third region being positioned around an outer surface of said outer liner.
Claim 17
Dependent Claim
25 words
A filter construction according to claim 1 wherein: (a) said fibers of said first region are not mixed into said fibers of said second region.
Claim 18
Dependent Claim
19 words
A filter construction according to claim 1 wherein: (a) said first region of fibrous depth media comprises polyester fibers.
Claim 19
Dependent Claim
19 words
A filter construction according to claim 1 wherein: (a) said second region of fibrous depth media comprises polyester fibers.
Claim 20
Dependent Claim
62 words
A filter construction according to claim 1 wherein: (a) said cylindrical filter media arrangement includes at least two overlapping cylindrical layers of media; a first cylindrical layer comprising said first region of fibrous depth media; and a second cylindrical layer comprising said second region of fibrous depth media; and (b) said second region of fibrous depth media comprises a gradient density region.
Claim 21
Dependent Claim
46 words
A filter construction according to claim 1 wherein: (a) said cylindrical filter media arrangement comprises a structure resulting from coaxially wrapping at least one layer of fibrous depth media of a first construction and at least one layer of fibrous depth media of a second construction.
Claim 22
Dependent Claim
246 words
A filter construction comprising: (a) first and second end caps; each of said first and second end caps comprising polyurethane foam; (i) said first end cap having a central air flow exit aperture therein; (ii) said second end cap comprising a closed end cap having no central aperture therein; (b) a cylindrical inner liner embedded in, and extending between, said first and second end caps; (c) a cylindrical outer liner embedded in, and extending between, said first and second end caps; and, (d) a cylindrical filter media arrangement positioned between said inner liner and said outer liner; said cylindrical filter media arrangement extending between said first and second end caps; said filter media arrangement including: (i) a first region of fibrous depth media comprising fibers and having a average percent solidity, within the construction, of no greater than 3%; said first region of fibrous depth media being positioned adjacent to and in contact with said outer liner; said first region having an average fiber diameter within the range of 16-22 microns; and, (ii) a second region of fibrous depth media positioned immediately downstream from said first region of fibrous depth media; said second region of fibrous depth media comprising fibers and having an average fiber diameter which is less than said average fiber diameter of said first region of depth media; (e) said filter construction being constructed and arranged for filtering air flow, during use, from an upstream, outermost, side through to a downstream, inner, side.
Claim 23
Dependent Claim
246 words
A filter construction comprising: (a) first and second end caps; each of said first and second end caps comprising polyurethane foam; (i) said first end cap having a central air flow exit aperture therein; (ii) said second end cap comprising a closed end cap having no central aperture therein; (b) a cylindrical inner liner embedded in, and extending between, said first and second end caps; (c) a cylindrical outer liner embedded in, and extending between, said first and second end caps; and, (d) a cylindrical filter media arrangement positioned between said inner liner and said outer liner; said cylindrical filter media arrangement extending between said first and second end caps; said filter media arrangement including: (i) a first region of fibrous depth media comprising fibers and having a average percent solidity, within the construction, of no greater than 3%; said first region of fibrous depth media being positioned adjacent to and in contact with said outer liner; said first region having an average fiber diameter within the range of 16-22 microns; and, (ii) a second region of fibrous depth media positioned immediately downstream from said first region of fibrous depth media; said second region of fibrous depth media comprising fibers and having an average fiber diameter which is less than said average fiber diameter of said first region of depth media; (e) said filter construction being constructed and arranged for filtering air flow, during use, from an upstream, outermost, side through to a downstream, inner, side.
Claim 24
Dependent Claim
41 words
A filter construction according to claim 21 wherein: (a) said second region of depth media has an average percent solidity, within the filter construction, of at least 20% more than an average percent solidity of the first region of depth media.
Claim 25
Dependent Claim
43 words
A filter construction according to claim 22 wherein: (a) said second region of fibrous depth media has an average percent solidity, with the filter construction, of 20% to 50% more than an average percent solidity of the first region of fibrous depth media.
Claim 26
Dependent Claim
31 words
A filter construction according to claim 23 wherein: (a) said second region of depth media has an average percent solidity, within the filter construction, within the range of 1.8 to 3.5%.
Claim 27
Dependent Claim
36 words
A filter construction according to claim 24 wherein: (a) said second region of depth media comprises, by volume, 35% to 60% of all depth media in said first and second regions of depth media taken together.
Claim 28
Dependent Claim
48 words
A filter construction according to claim 25 wherein: (a) said first region comprises a mixture of fibers of a first denier and second denier, said second denier being larger than said first denier; a majority of said fiber mixture, by weight, comprising said fibers of said second denier.
Claim 29
Dependent Claim
57 words
A filter construction according to claim 26 wherein: (a) said first region comprises a mixture of fibers of 1.5 denier and 6 denier; and (b) said first region of fibrous depth media is constructed and arranged for operational loading therein of at least 60%, by weight, of all solids loaded on said filter media arrangement, during use.
Claim 30
Dependent Claim
20 words
A filter construction according to claim 27 wherein: (a) said second region of fibrous depth media comprises 1.5 denier fibers.
Claim 31
Dependent Claim
27 words
A filter construction according to claim 27 wherein: (a) said first region of depth media comprises 40-65%, of a total depth media volume within said filter construction.
Claim 32
Dependent Claim
51 words
A filter construction according to claim 21 wherein: (a) said second region of depth media is constructed and arranged to collect at least 60%, by weight, of material which is collected by said cylindrical filter media arrangement, in use, but which is not collected by said first region of depth media.
Claim 33
Dependent Claim
23 words
A filter construction according to claim 30 including: (a) a cylindrical surface loading media positioned downstream from said second region of depth media.
Claim 34
Dependent Claim
51 words
A filter construction according to claim 30 wherein: (a) said second region of depth media is constructed and arranged to collect at least 80%, by weight, of material which is collected by said cylindrical filter media arrangement, in use, but which is not collected by said first region of depth media.
Claim 35
Dependent Claim
37 words
A filter construction according to claim 32 wherein: (a) said first region of fibrous depth media is constructed and arranged for passage therethrough of at least 10%, by weight, of particles greater than 10 microns, during use.
Claim 36
Dependent Claim
27 words
A filter construction according to claim 33 wherein: (a) said first region of fibrous depth media has an average fiber diameter within the range of 18-20 microns.
Claim 37
Dependent Claim
42 words
A filter construction according to claim 34 wherein: (a) said first and second regions of depth media are constructed and arranged for a total operational loading therein of at least 90%, by weight, of material loaded on said filter construction, in use.
Claim 38
Dependent Claim
23 words
A filter construction according to claim 21 including: (a) a cylindrical pleated paper filter positioned downstream from said second region of depth media.
Claim 39
Dependent Claim
50 words
A filter construction according to claim 21 including: (a) a third region of depth media positioned downstream from said second region of fibrous depth media; and (b) said third region of fibrous depth media is spaced from said second region of fibrous depth media by a pleated paper filter member.
Claim 40
Dependent Claim
62 words
A filter construction according to claim 21 wherein: (a) said cylindrical filter media arrangement includes at least two overlapping cylindrical layers of media; a first cylindrical layer comprising said first region of fibrous depth media; and a second cylindrical layer comprising said second region of fibrous depth media; and (b) said second region of fibrous depth media comprises a gradient density region.
Claim 41
Dependent Claim
351 words
A filter construction comprising: (a) first and second end caps; each of said first and second end caps comprising polyurethane foam; (i) said first end cap having a central air flow exit aperture therein; (ii) said second end cap comprising a closed end cap having no central aperture therein; (b) a cylindrical inner liner embedded in, and extending between, said first and second end caps; (c) a cylindrical outer liner embedded in, and extending between, said first and second end caps; and, (d) a cylindrical filter media arrangement positioned between said inner liner and said outer liner; said cylindrical filter media arrangement extending between said first and second end caps; said filter media arrangement including: (i) a first region of fibrous depth media comprising polyester fibers; said first region being positioned adjacent to and in contact with said outer liner; said first region having an average fiber diameter within a range of 16-22 microns; said first region comprising a mixture of polyester fibers of a first denier and second denier, said second denier being larger than said first denier; a majority of said polyester fiber mixture, by weight, comprising said fibers of said second denier; and said first region being constructed and arranged for operational loading therein of: (A) at least 60%, by weight, of all solids loaded on said filter media arrangement, during use; and (B) at least two times, by weight, the amount of operationally retained solids in all fibrous depth media downstream from said first region; (ii) a second region of fibrous depth media comprising fibers and positioned immediately downstream from said first region of fibrous depth media; said second region of depth media being constructed and arranged to have a propensity to trap solids which is greater said first region; (iii) wherein said first region of fibrous depth media has a thickness of at least 50% of an overall combined thickness of the first and second regions of fibrous depth media; and (e) said filter construction being constructed and arranged for filtering air flow, during use, from an upstream, outermost, side through to a downstream, inner, side.
Claim 42
Dependent Claim
351 words
A filter construction comprising: (a) first and second end caps; each of said first and second end caps comprising polyurethane foam; (i) said first end cap having a central air flow exit aperture therein; (ii) said second end cap comprising a closed end cap having no central aperture therein; (b) a cylindrical inner liner embedded in, and extending between, said first and second end caps; (c) a cylindrical outer liner embedded in, and extending between, said first and second end caps; and, (d) a cylindrical filter media arrangement positioned between said inner liner and said outer liner; said cylindrical filter media arrangement extending between said first and second end caps; said filter media arrangement including: (i) a first region of fibrous depth media comprising polyester fibers; said first region being positioned adjacent to and in contact with said outer liner; said first region having an average fiber diameter within a range of 16-22 microns; said first region comprising a mixture of polyester fibers of a first denier and second denier, said second denier being larger than said first denier; a majority of said polyester fiber mixture, by weight, comprising said fibers of said second denier; and said first region being constructed and arranged for operational loading therein of: (A) at least 60%, by weight, of all solids loaded on said filter media arrangement, during use; and (B) at least two times, by weight, the amount of operationally retained solids in all fibrous depth media downstream from said first region; (ii) a second region of fibrous depth media comprising fibers and positioned immediately downstream from said first region of fibrous depth media; said second region of depth media being constructed and arranged to have a propensity to trap solids which is greater said first region; (iii) wherein said first region of fibrous depth media has a thickness of at least 50% of an overall combined thickness of the first and second regions of fibrous depth media; and (e) said filter construction being constructed and arranged for filtering air flow, during use, from an upstream, outermost, side through to a downstream, inner, side.
Claim 43
Dependent Claim
56 words
A filter construction according to claim 39 wherein: (a) said first region of fibrous depth media comprises polyester filters having a first average percent solidity; and (b) said second region of fibrous depth media comprises fibers having a second average percent solidity, wherein said second average percent solidity is greater than said first average percent solidity.
Claim 44
Dependent Claim
19 words
A filter construction according to claim 39 wherein: (a) said second region of fibrous depth media comprises polyester fibers.
Claim 45
Dependent Claim
25 words
A filter construction according to claim 31 wherein: (a) said first region of fibrous depth media is secured to said outer liner by an adhesive.
Claim 46
Dependent Claim
25 words
A filter construction according to claim 39 wherein: (a) said fibers of said first region are not mixed into said fibers of said second region.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-08-31 | 2002-03-02 | 2002-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-31 | 2006-03-02 | 2006-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-31 | 2010-03-02 | 2010-09-01 | $7700.00 | Window Closed / Lapsed |