Patent US5082476A successfully refreshed from Google Patents.
US5082476A
Expired / Lapsed
US
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Filtration arrangement and method
Assignee: Donaldson Co Inc
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Filing: 1990-10-19
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Granted: 1992-01-21
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Expires: 2010-10-19
Abstract
Abstract Constructions and methods are described for collecting particulate material from gas streams. In one specifically described arrangement, a region of uniform or constant density depth media is oriented upstream of a region of gradient density depth media. In another, a preferred region of gradient density depth media is constructed, to effect particulate collection in a preferred manner. Preferred constructions described herein, utilize a pleated paper filter oriented downstream of depth media, to advantage.
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 09:14
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/56; B01D46/62; B01D46/64; B01D39/00; B01D39/14; 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; B01D2275/00; B01D2275/10
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
103 words
A filter construction comprising: (a) an upstream region of substantially constant density depth media having a percent solidity of no greater than about 3%; and (b) a downstream region of gradient density depth media; (i) said region of constant density depth media being constructed and arranged for operational loading therein of at least 65% by weight of retained solids within said filter construction; and (ii) said region of gradient density depth media being constructed and arranged for operational loading therein of at least 50% by weight of retained solids not retained within said upstream region, but which are retained within said filter construction.
Claim 2
Dependent Claim
103 words
A filter construction comprising: (a) an upstream region of substantially constant density depth media having a percent solidity of no greater than about 3%; and (b) a downstream region of gradient density depth media; (i) said region of constant density depth media being constructed and arranged for operational loading therein of at least 65% by weight of retained solids within said filter construction; and (ii) said region of gradient density depth media being constructed and arranged for operational loading therein of at least 50% by weight of retained solids not retained within said upstream region, but which are retained within said filter construction.
Claim 3
Dependent Claim
44 words
A filter construction according to claim 1 constructed and arranged such that the ratio of operationally retained solids in said volume of said region of constant density depth media to said region of gradient density depth media is at least about 5 to 1.
Claim 4
Dependent Claim
44 words
A filter construction according to claim 2 including: (a) an outer liner oriented adjacent an upstream side of said region of constant density depth media; and (b) means securing said upstream side of said region of constant density depth media to said outer liner.
Claim 5
Dependent Claim
44 words
A filter construction according to claim 1 including: (a) an outer liner oriented adjacent an upstream side of said region of constant density depth media; and (b) means securing said upstream side of said region of constant density depth media to said outer liner.
Claim 6
Dependent Claim
39 words
A construction according to claim 1 wherein: (a) said region of constant density depth media is provided with a substantially oval cross-section taken in a direction substantially coplanar with a flow path of gas against said construction, during use.
Claim 7
Dependent Claim
39 words
A construction according to claim 5 wherein: (a) said region of gradient density depth media is provided with a substantially circular cross-section taken in a direction substantially coplanar with a flow path of gas against said construction, during use.
Claim 8
Dependent Claim
25 words
A construction according to claim 6 including: (a) a cylindrical paper filter oriented adjacent a downstream side of said region of gradient density depth media.
Claim 9
Dependent Claim
15 words
A construction according to claim 7 wherein said paper filter comprises a fluted paper filter.
Claim 10
Dependent Claim
24 words
A construction according to claim 1 including: (a) a paper filter oriented adjacent a downstream side of said region of gradient density depth media.
Claim 11
Dependent Claim
15 words
A construction according to claim 9 wherein said paper filter comprises a fluted paper filter.
Claim 12
Dependent Claim
27 words
An arrangement according to claim 9 including an inner liner oriented adjacent a side of said paper filter opposite from said region of gradient density depth media.
Claim 13
Dependent Claim
49 words
A filter construction according to claim 1 wherein: (a) said upstream region of substantially constant density depth media has a percent solidity of no greater than about 2%; and, (b) said upstream region of substantially constant density depth media comprises two layers of material separated by a porous liner.
Claim 14
Dependent Claim
64 words
A filter construction according to claim 1 wherein: (a) said upstream region of substantially constant density depth media has a percent solidity of no greater than about 2%; and, (b) said downstream region of gradient density depth media has a percent solidity increasing from about 1-2% up to at least about 2-5% in transition from a most upstream portion to a most downstream portion.
Claim 15
Dependent Claim
24 words
A filter construction according to claim 13 wherein said upstream region comprises at least 60% by volume of depth media in said filter construction.
Claim 16
Dependent Claim
24 words
A filter construction according to claim 1 wherein said upstream region comprises at least 60% by volume of depth media in said filter construction.
Claim 17
Dependent Claim
24 words
A filter construction according to claim 1 wherein said upstream region comprises at least 70% by volume of depth media in said filter construction.
Claim 18
Dependent Claim
218 words
A filter construction having an upstream side and a downstream side; said filter construction including: (a) a paper filter arrangement oriented adjacent said filter construction downstream side; and, (b) a depth media filter arrangement oriented upstream of said paper filter arrangement; said depth media arrangement comprising: (i) at least four layers of depth media each of which has a different percent solidity at least the other from three of the at least four layers of depth media within the depth media arrangement; said at least four layers of depth media including a most upstream layer of depth media and being arranged in stages oriented in downstream progression; (ii) none of said layers of depth media, except optionally said uppermost layer of depth media, comprising more than 25% by volume of depth media in said depth media filter arrangement; (iii) said most upstream layer of depth media comprising less than 50% by volume of depth media in said depth media filter arrangement; (iv) said most upstream layer of depth media having a percent solidity of 1-2%; and, (v) a next three downstream layers of depth media from said most upstream layer each having a greater percent solidity than a next upstream layer; and, each having a percent solidity no more than about 50% greater than a next upstream layer.
Claim 19
Dependent Claim
218 words
A filter construction having an upstream side and a downstream side; said filter construction including: (a) a paper filter arrangement oriented adjacent said filter construction downstream side; and, (b) a depth media filter arrangement oriented upstream of said paper filter arrangement; said depth media arrangement comprising: (i) at least four layers of depth media each of which has a different percent solidity at least the other from three of the at least four layers of depth media within the depth media arrangement; said at least four layers of depth media including a most upstream layer of depth media and being arranged in stages oriented in downstream progression; (ii) none of said layers of depth media, except optionally said uppermost layer of depth media, comprising more than 25% by volume of depth media in said depth media filter arrangement; (iii) said most upstream layer of depth media comprising less than 50% by volume of depth media in said depth media filter arrangement; (iv) said most upstream layer of depth media having a percent solidity of 1-2%; and, (v) a next three downstream layers of depth media from said most upstream layer each having a greater percent solidity than a next upstream layer; and, each having a percent solidity no more than about 50% greater than a next upstream layer.
Claim 20
Independent Claim
139 words
A method of filtering particulate material from a gas stream; said method including the steps of: (a) collecting at least 65% by weight of total particulates collected from the gas stream in a constant density depth media having a percent solidity of no greater than about 2%; (b) collecting at least 50% by weight of total particulates collected from the gas stream but not collected in the constant density depth media, in a gradient density depth media; said step of collecting in a gradient density depth media being conducted after said step of collecting in a constant density depth media; and, (c) collecting a remainder of total particulates collected from the gas stream with a paper filter; said step of collecting with a paper filter being conducted downstream from said step of collecting in a gradient density depth media.
Claim 21
Independent Claim
139 words
A method of filtering particulate material from a gas stream; said method including the steps of: (a) collecting at least 65% by weight of total particulates collected from the gas stream in a constant density depth media having a percent solidity of no greater than about 2%; (b) collecting at least 50% by weight of total particulates collected from the gas stream but not collected in the constant density depth media, in a gradient density depth media; said step of collecting in a gradient density depth media being conducted after said step of collecting in a constant density depth media; and, (c) collecting a remainder of total particulates collected from the gas stream with a paper filter; said step of collecting with a paper filter being conducted downstream from said step of collecting in a gradient density depth media.
References Cited (Backward Citations)
US1743675A
Cited
US1771639A
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
US4233042A
Cited
US4314832A
Cited
US4322230A
Cited
US4695300A
Cited
US4536440A
Cited
US4647373A
Cited
US4619674A
Cited
US4758460A
Cited
US4629483A
Cited
US4650506A
Cited
US4720292A
Cited
US4976759A
Cited
US4720292B1
Cited
US4720292B2
Cited
US4701197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-01-20 | 1995-07-22 | 1996-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-20 | 1999-07-22 | 2000-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-20 | 2003-07-22 | 2004-01-21 | $7700.00 | Window Closed / Lapsed |