US5238474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration arrangement
Assignee: Donaldson Co Inc
•
Filing: 1992-06-12
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Granted: 1993-08-24
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Expires: 2012-06-12
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
2026-10-28 20:05
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: 18
Claim 1
Independent Claim
137 words
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.
Claim 2
Dependent Claim
137 words
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.
Claim 3
Dependent Claim
29 words
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.
Claim 4
Dependent Claim
38 words
A filter construction according to claim 1 wherein said first region of depth media occupies less than 70% of a total volume of depth media within said construction which is located upstream from said oiled, pleated paper filter.
Claim 5
Dependent Claim
30 words
A filter construction according to claim 1 wherein said second region of depth media has a percent solidity greater than a percent solidity of said first region of depth media.
Claim 6
Dependent Claim
52 words
A filter construction according to claim 1 wherein: (a) said first region of depth media comprises material having an average fiber size within a range of about 16 to 22 microns; and, (b) said second region of depth media comprises material having an average fiber size of less than about 18 microns.
Claim 7
Dependent Claim
28 words
A filter construction according to claim 1 wherein said first region of depth media comprises fibers having an average fiber size of between about 16 and 22 microns.
Claim 8
Dependent Claim
26 words
A filter construction according to claim 1 wherein said second region of depth media comprises fibers having an average diameter of less than about 18 microns.
Claim 9
Dependent Claim
28 words
A filter construction according to claim 1 wherein said first region of depth media comprises fibers having an average fiber size of between about 18 and 20 microns.
Claim 10
Dependent Claim
31 words
A filter construction according to claim 1 wherein: (a) each of said first and second regions-of depth media ia cylindrically shaped; and (b) said oiled pleated paper filter is cylindrically shaped.
Claim 11
Dependent Claim
38 words
A filter construction according to claim 9 wherein said first region of depth media occupies less than 70% of a total volume of depth media within said construction which is located upstream from said oiled pleated paper filter.
Claim 12
Dependent Claim
125 words
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.
Claim 13
Dependent Claim
125 words
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.
Claim 14
Dependent Claim
63 words
A filter construction according to claim 11 wherein: (a) said first region of depth media occupies less than 70% of a total volume of depth media within said construction which is located upstream of said oiled pleated paper filter; and, (b) said second region of depth media has a percent solidity greater than a percent solidity of said first region of depth media.
Claim 15
Dependent Claim
52 words
A filter construction according to claim 12 wherein: (a) said first region of depth media comprises material having an average fiber size within a range of about 16 to 22 microns; and, (b) said second region of depth media comprises material having an average fiber size of less than about 18 microns.
Claim 16
Dependent Claim
29 words
A filter construction according to claim 13 including a third region of depth media; said third region of depth media being positioned downstream from said oiled pleated paper filter.
Claim 17
Dependent Claim
52 words
A filter construction according to claim 11 wherein: (a) said first region of depth media comprises material having an average fiber size within a range of about 16 to 22 microns; and, (b) said second region of depth media comprises material having an average fiber size of less than about 18 microns.
Claim 18
Dependent Claim
29 words
A filter construction according to claim 15 including a third region of depth media; said third region of depth media being positioned downstream from said oiled pleated paper filter.
References Cited (Backward Citations)
US1771639A
Cited
US1743675A
Cited
US2174528A
Cited
US2334840A
Cited
US2918138A
Cited
US2966960A
Cited
US3290870A
Cited
US3298149A
Cited
US3417551A
Cited
US3552553A
Cited
US3727769A
Cited
US3680659A
Cited
US3918945A
Cited
US3766629A
Cited
US3822531A
Cited
US4093437A
Cited
US3990333A
Cited
US4086070A
Cited
US4102785A
Cited
US4074985A
Cited
FR2380058A1
Cited
US4233042A
Cited
US4314832A
Cited
US4322230A
Cited
EP0053879A2
Cited
US4695300A
Cited
WO1984003450A1
Cited
US4536440A
Cited
US4647373A
Cited
US4619674A
Cited
US4758460A
Cited
EP0212082A1
Cited
US4629483A
Cited
US4650506A
Cited
US4720292A
Cited
US4976759A
Cited
US4720292B1
Cited
US4720292B2
Cited
US4701197A
Cited
US5122270A
Cited
US5082476A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-08-23 | 1997-02-22 | 1997-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-23 | 2001-02-22 | 2001-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-23 | 2005-02-22 | 2005-08-24 | $7700.00 | Window Closed / Lapsed |