US5174969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roll-pack diesel particulate filter
Assignee: 3M Co
•
Filing: 1991-04-05
•
Granted: 1992-12-29
•
Expires: 2011-04-05
Abstract
Abstract An efficient, economical, compact diesel particulate filter comprising a casing radially filled with a bundle of tubes comprising woven, braided, or knitted inorganic yarn, wherein each tube is at least about twice the length of the bundle, and is folded at one end to prevent exhaust from traveling through the hollow of the tube without passing through its wall.
Inventors
- 👤 Edward M. Fischer
- 👤 Donald D. Johnson
- 👤 Stephen M. Sanocki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:31
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/0211; F01N3/022; F01N3/0226; F01N2330/00; F01N2330/08; F02; F02B; F02B3/00; F02B3/06; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S55/00; Y10S55/10; Y10S55/30
Claims Analysis
Total Claims: 55
Claim 1
Independent Claim
125 words
A diesel particulate filter comprising (a) a casing having an inlet end and an outlet end; (b) means for connecting said ends of said casing to an exhaust system; and (c) a filtering element substantially radially filling said casing, said filtering element comprising (i) a plurality of parallel, hollow tubes, each tube comprising one of woven, braided, or knitted inorganic yarn, said tubes extending between said ends of said casing in layers, said tubes being open at one of said inlet and said outlet end of said casing, and said tubes being integral in pairs by means of a fold; and (ii) means for restricting flow of exhaust along channels between adjacent ones of said parallel tubes and between said filtering element and said casing.
Claim 2
Dependent Claim
125 words
A diesel particulate filter comprising (a) a casing having an inlet end and an outlet end; (b) means for connecting said ends of said casing to an exhaust system; and (c) a filtering element substantially radially filling said casing, said filtering element comprising (i) a plurality of parallel, hollow tubes, each tube comprising one of woven, braided, or knitted inorganic yarn, said tubes extending between said ends of said casing in layers, said tubes being open at one of said inlet and said outlet end of said casing, and said tubes being integral in pairs by means of a fold; and (ii) means for restricting flow of exhaust along channels between adjacent ones of said parallel tubes and between said filtering element and said casing.
Claim 3
Dependent Claim
37 words
The diesel particulate filter according to claim 1 wherein all of said tubes are open at said outlet end of said casing and wherein all of said tubes are blocked at said inlet end of said casing.
Claim 4
Dependent Claim
19 words
The diesel particulate filter according to claim 1 wherein each fold is at said inlet end of said casing.
Claim 5
Dependent Claim
40 words
The diesel particulate filter according to claim 1 wherein said hollow tubes incorporate heat-fugitive yarn in an amount up to about 30 volume percent, based on the total volume of said inorganic yarn and said heat-fugitive yarn comprising said tubes.
Claim 6
Dependent Claim
44 words
The diesel particulate filter according to claim 1 wherein said means for restricting said flow of exhaust along said channels between adjacent tubes comprises an inorganic filler, said inorganic filler filling the length of said channels within a layer of said plurality of tubes.
Claim 7
Dependent Claim
17 words
The diesel particulate filter according to claim 5 wherein said inorganic filler comprises a texturized ceramic yarn.
Claim 8
Dependent Claim
16 words
The diesel particulate filter according to claim 6 wherein said ceramic yarn comprises an alumina-boria-silica ceramic.
Claim 9
Dependent Claim
34 words
The diesel particulate filter according to claim 5 wherein said filler further comprises up to about 30 percent heat-fugitive yarn, based on the total volume of said inorganic filler and said heat fugitive yarn.
Claim 10
Dependent Claim
48 words
The diesel particulate filter according to claim 1 wherein said means for restricting said flow of exhaust along said channels between said tubes comprises an inorganic filler, said inorganic filler filling at least a portion of each of said channels within a layer of said plurality of tubes.
Claim 11
Dependent Claim
33 words
The diesel particulate filter according to claim 9 further comprising inorganic stuffer in said channels between layers of said tubes, said inorganic stuffer being present only at one end of said filtering element.
Claim 12
Dependent Claim
17 words
The diesel particulate filter according to claim 10 wherein said inorganic stuffer comprises an inorganic nonwoven mat.
Claim 13
Dependent Claim
15 words
The diesel particulate filter according to claim 11 wherein said nonwoven mat is a filter.
Claim 14
Dependent Claim
15 words
The diesel particulate filter according to claim 11 wherein said nonwoven mat comprises ceramic microfibers.
Claim 15
Dependent Claim
16 words
The diesel particulate filter according to claim 13 wherein said ceramic microfibers comprise an alumina-boria-silica ceramic.
Claim 16
Dependent Claim
30 words
The diesel particulate filter according to claim 1 wherein said means for restricting the flow of exhaust along channels between said filtering element and said casing comprises an intumescent mat.
Claim 17
Dependent Claim
22 words
The diesel particulate filter according to claim 1 further comprising an inorganic warp perpendicular to the longitudinal axis of said parallel tubes.
Claim 18
Dependent Claim
15 words
The diesel particulate filter according to claim 16 wherein said inorganic warp comprises inorganic yarn.
Claim 19
Dependent Claim
22 words
The diesel particulate filter according to claim 17 further comprising an organic warp perpendicular to the longitudinal axis of said parallel tubes.
Claim 20
Dependent Claim
19 words
The diesel particulate filter according to claim 1 further comprising a pressure-sensitive sheet material between layers of said tubes.
Claim 21
Dependent Claim
18 words
The diesel particulate filter according to claim 1 further comprising an oxidation catalyst coated onto said inorganic yarn.
Claim 22
Dependent Claim
16 words
The diesel particulate filter according to claim 1 wherein said inorganic yarn comprises a ceramic yarn.
Claim 23
Dependent Claim
14 words
The diesel particulate filter according to claim 21 wherein said ceramic yarn is texturized.
Claim 24
Dependent Claim
15 words
The diesel particulate filter according to claim 22 wherein said ceramic yarn comprises alumina-boria-silica ceramic.
Claim 25
Dependent Claim
132 words
A diesel particulate filter comprising (a) a casing having an inlet end and an outlet end; (b) means for connecting said ends of said casing to an exhaust system; and (c) a filtering element substantially radially filling said casing, said filtering element comprising (i) a continuous hollow tube comprising one of woven, braided, or knitted inorganic yarn, said tube being folded in a zig-zag pattern to provide a layer comprising a plurality of parallel tube segments, wherein ends of said tube segments are defined by folds, said layer being spirally wound such that said ends of said tube segments extend between said ends of said casing, and (ii) means for restricting flow of exhaust along channels between adjacent ones of said parallel tube segments and between said filtering element and said casing.
Claim 26
Dependent Claim
132 words
A diesel particulate filter comprising (a) a casing having an inlet end and an outlet end; (b) means for connecting said ends of said casing to an exhaust system; and (c) a filtering element substantially radially filling said casing, said filtering element comprising (i) a continuous hollow tube comprising one of woven, braided, or knitted inorganic yarn, said tube being folded in a zig-zag pattern to provide a layer comprising a plurality of parallel tube segments, wherein ends of said tube segments are defined by folds, said layer being spirally wound such that said ends of said tube segments extend between said ends of said casing, and (ii) means for restricting flow of exhaust along channels between adjacent ones of said parallel tube segments and between said filtering element and said casing.
Claim 27
Dependent Claim
40 words
The diesel particulate filter according to claim 24 wherein said means for restricting said flow of exhaust along said channels between said tube segments comprises an inorganic filler, said inorganic filler filling the length of said channels within said layers.
Claim 28
Dependent Claim
17 words
The diesel particulate filter according to claim 25 wherein said inorganic filler comprises a texturized ceramic yarn.
Claim 29
Dependent Claim
15 words
The diesel particulate filter according to claim 26 wherein said ceramic yarn comprises alumina-boria-silica ceramic.
Claim 30
Dependent Claim
44 words
The diesel particulate filter according to claim 24 wherein said means for restricting said flow of exhaust along said channels between said tube segments comprises an inorganic filler, said inorganic filler filling at least a portion of each of said channels within said layer.
Claim 31
Dependent Claim
42 words
The diesel particulate filter according to claim 28 further comprising inorganic stuffer in a portion of said channels between layers of said spirally wound layer of said tube segments, said inorganic stuffer being present only at one end of said filtering element.
Claim 32
Dependent Claim
17 words
The diesel particulate filter according to claim 29 wherein said inorganic stuffer comprises an inorganic nonwoven mat.
Claim 33
Dependent Claim
15 words
The diesel particulate filter according to claim 30 wherein said nonwoven mat comprises ceramic microfibers.
Claim 34
Dependent Claim
15 words
The diesel particulate filter according to claim 31 wherein said ceramic microfibers comprise alumina-boria-silica ceramic.
Claim 35
Dependent Claim
30 words
The diesel particulate filter according to claim 24 wherein said means for restricting the flow of exhaust along channels between said filtering element and said casing comprises an intumescent mat.
Claim 36
Dependent Claim
15 words
The diesel particulate filter according to claim 24 wherein said inorganic yarn comprises ceramic yarn.
Claim 37
Dependent Claim
14 words
The diesel particulate filter according to claim 34 wherein said ceramic yarn is texturized.
Claim 38
Dependent Claim
15 words
The diesel particulate filter according to claim 33 wherein said ceramic yarn comprises alumina-boria-silica ceramic.
Claim 39
Dependent Claim
18 words
The diesel particulate filter according to claim 24 further comprising an oxidation catalyst coated onto said inorganic yarn.
Claim 40
Dependent Claim
141 words
A diesel particulate filter comprising (a) a casing having an inlet end and an outlet end; (b) means for connecting said ends of said casing to an exhaust system; and (c) a filtering element substantially radially filling said casing, said filtering element comprising (i) a plurality of parallel, hollow tubes, each tube comprising one of woven braided, or knitted inorganic yarn, said tubes extending between said ends of said casing in layers, said tubes being open at one of said inlet and said outlet end of said casing, and said tubes being blocked at one of said outlet end and said inlet end of said casing; and (ii) means for restricting flow of exhaust along channels between adjacent ones of said parallel tubes and between said filtering element and said casing, wherein said means for restricting flow provides filtration of exhaust.
Claim 41
Dependent Claim
141 words
A diesel particulate filter comprising (a) a casing having an inlet end and an outlet end; (b) means for connecting said ends of said casing to an exhaust system; and (c) a filtering element substantially radially filling said casing, said filtering element comprising (i) a plurality of parallel, hollow tubes, each tube comprising one of woven braided, or knitted inorganic yarn, said tubes extending between said ends of said casing in layers, said tubes being open at one of said inlet and said outlet end of said casing, and said tubes being blocked at one of said outlet end and said inlet end of said casing; and (ii) means for restricting flow of exhaust along channels between adjacent ones of said parallel tubes and between said filtering element and said casing, wherein said means for restricting flow provides filtration of exhaust.
Claim 42
Dependent Claim
37 words
The diesel particulate filter according to claim 38 wherein all of said tubes are open at said outlet end of said casing and wherein all of said tubes are blocked at said inlet end of said casing.
Claim 43
Dependent Claim
44 words
The diesel particulate filter according to claim 38 wherein said means for restricting said flow of exhaust along said channels between said tubes comprises an inorganic filler, said inorganic filler filling the length of said channels within a layer of said plurality of tubes.
Claim 44
Dependent Claim
17 words
The diesel particulate filter according to claim 40 wherein said inorganic filler comprises a texturized ceramic yarn.
Claim 45
Dependent Claim
15 words
The diesel particulate filter according to claim 41 wherein said ceramic yarn comprises alumina-boria-silica ceramic.
Claim 46
Dependent Claim
48 words
The diesel particulate filter according to claim 38 wherein said means for restricting said flow of exhaust along said channels between said tubes comprises an inorganic filler, said inorganic filler filling at least a portion of each of said channels within a layer of said plurality of tubes.
Claim 47
Dependent Claim
33 words
The diesel particulate filter according to claim 43 further comprising inorganic stuffer in said channels between layers of said tubes, said inorganic stuffer being present only at one end of said filtering element.
Claim 48
Dependent Claim
17 words
The diesel particulate filter according to claim 44 wherein said inorganic stuffer comprises an inorganic nonwoven mat.
Claim 49
Dependent Claim
15 words
The diesel particulate filter according to claim 45 wherein said nonwoven mat comprises ceramic microfibers.
Claim 50
Dependent Claim
15 words
The diesel particulate filter according to claim 46 wherein said ceramic microfibers comprise alumina-boria-silica ceramic.
Claim 51
Dependent Claim
30 words
The diesel particulate filter according to claim 38 wherein said means for restricting the flow of exhaust along channels between said filtering element and said casing comprises an intumescent mat.
Claim 52
Dependent Claim
15 words
The diesel particulate filter according to claim 38 wherein said inorganic yarn comprises ceramic yarn.
Claim 53
Dependent Claim
14 words
The diesel particulate filter according to claim 49 wherein said ceramic yarn is texturized.
Claim 54
Dependent Claim
15 words
The diesel particulate filter according to claim 50 wherein said ceramic yarn comprises alumina-boria-silica ceramic.
Claim 55
Dependent Claim
18 words
The diesel particulate filter according to claim 38 further comprising an oxidation catalyst coated onto said inorganic yarn.
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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) | 1995-12-29 | 1996-06-29 | 1996-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-12-29 | 2000-06-29 | 2000-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-12-29 | 2004-06-29 | 2004-12-29 | $7700.00 | Window Closed / Lapsed |