US5454845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat-resistant filter
Assignee: Toyota Industries Corp
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Filing: 1993-09-21
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Granted: 1995-10-03
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Expires: 2013-09-21
Abstract
Abstract The present invention relates to a heat-resistant filter which is suitable for trapping particulate contained in a high temperature exhaust gas from an engine, and can be reconditioned by removing with burning the trapped particulate. This invention aims at providing a heat-resistant filter, which will suppress a rise in back pressure to a small amount even when exhaust gas processing is executed for a long period of time, will not cause problems in removing deposits through heating and burning by an electrical heat-generating member, and can endure corrosive action under a high-temperature acidic atmosphere. A filter layer having heat-resistant fibers laminated at random is provided between two air-permeable partitions, the first of which is disposed upstream in the direction of a fluid flow to be filtered and is formed of a planar fabric made of non-conductive heat-resistant fibers.
Inventors
- 👤 Meiji Anahara
- 👤 Makoto Tsuzuki
- 👤 Ryuta Kamiya
- 👤 Hiroshi Matsuura
- 👤 Yoshiharu Yasui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:40
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/24; B01D46/2403; B01D46/2407; B01D39/00; B01D39/14; B01D46/56; B01D46/58; B01D46/66; B01D46/80; B01D46/84; F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/022; F01N3/0226; F01N3/023; F01N3/027; F01N3/031; F01N3/032; B01D2273/00; B01D2273/20; F01N2330/00; F01N2330/10; Y; Y10; Y10S; Y10S55/00; Y10S55/10; Y10S55/30
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
88 words
A heat-resistant filter for use in an exhaust gas passage in communication with an engine to collect particulate contained in exhaust gas, said filter comprising: a filter layer of randomly disposed heat-resistant fibers; and first and second air-permeable partitions facing each other with said filter layer therebetween; said first partition being disposed relative to the second partition for location upstream of the latter when the filter is installed in the exhaust gas passage, and wherein said first partition includes a planar fabric made of electrically non-conductive heat-resistant fibers.
Claim 2
Dependent Claim
88 words
A heat-resistant filter for use in an exhaust gas passage in communication with an engine to collect particulate contained in exhaust gas, said filter comprising: a filter layer of randomly disposed heat-resistant fibers; and first and second air-permeable partitions facing each other with said filter layer therebetween; said first partition being disposed relative to the second partition for location upstream of the latter when the filter is installed in the exhaust gas passage, and wherein said first partition includes a planar fabric made of electrically non-conductive heat-resistant fibers.
Claim 3
Dependent Claim
24 words
A heat-resistant filter according to claim 1, wherein both said air-permeable partitions are formed in a tube shape and arranged concentric to each other.
Claim 4
Dependent Claim
19 words
A heat-resistant filter according to claim 2, wherein both said air-permeable partitions have a rectangular shape in cross section.
Claim 5
Dependent Claim
21 words
A heat-resistant filter according to claim 1, further comprising an electrical heat-generating member disposed close to and along said first partition.
Claim 6
Dependent Claim
19 words
A heat-resistant filter according to claim 4, wherein said second air-permeable partition is formed of a woven metal wire.
Claim 7
Dependent Claim
35 words
A heat-resistant filter according to claim 5, further comprising a porous plate disposed relative to the second partition for location downstream of the second partition when the filter is installed in the exhaust gas passage.
Claim 8
Dependent Claim
23 words
A heat-resistant filter according to claim 4, wherein said filter has a body formed in a tube shape encircling the first air-permeable partition.
Claim 9
Dependent Claim
19 words
A heat-resistant filter according to claim 7, wherein said second air-permeable partition is formed of a woven metal wire.
Claim 10
Dependent Claim
41 words
A heat-resistant filter according to claim 8, wherein said tube body is formed of a porous plate disposed relative to the second air permeable partition for location downstream of the latter when the filter is installed in the exhaust gas passage.
Claim 11
Dependent Claim
17 words
A heat-resistant filter according to claim 9, further including a cover tube arranged outside the filter body.
Claim 12
Dependent Claim
19 words
A heat-resistant filter according to claim 4, wherein said filter has a body formed in a rectangular tube shape.
Claim 13
Dependent Claim
95 words
A heat-resistant filter for use in an exhaust gas passage in communication with an engine to collect particulate contained in exhaust gas, said filter comprising: a filter layer of randomly disposed heat-resistant fibers; and first and second air-permeable partitions formed in a tube shape and concentrically disposed facing each other with said filter layer therebetween; said first partition being disposed relative to the second partition for location upstream of the latter when the filter is installed in the exhaust gas passage, wherein said first partition includes a planar fabric made of electrically non-conductive heat-resistant fibers.
Claim 14
Dependent Claim
95 words
A heat-resistant filter for use in an exhaust gas passage in communication with an engine to collect particulate contained in exhaust gas, said filter comprising: a filter layer of randomly disposed heat-resistant fibers; and first and second air-permeable partitions formed in a tube shape and concentrically disposed facing each other with said filter layer therebetween; said first partition being disposed relative to the second partition for location upstream of the latter when the filter is installed in the exhaust gas passage, wherein said first partition includes a planar fabric made of electrically non-conductive heat-resistant fibers.
Claim 15
Dependent Claim
21 words
A heat-resistant filter according to claim 12 further comprising an electrical heat-generating member disposed close to and along said first partition.
Claim 16
Dependent Claim
19 words
A heat-resistant filter according to claim 13, wherein said second air-permeable partition is formed of a woven metal wire.
Claim 17
Dependent Claim
35 words
A heat-resistant filter according to claim 14, further comprising a porous plate disposed relative to the second partition for location downstream of the second partition when the latter is installed in the exhaust gas passage.
Claim 18
Dependent Claim
23 words
A heat-resistant filter according to claim 14, wherein said filter has a body formed in a tube shape encircling the first air-permeable partition.
Claim 19
Dependent Claim
19 words
A heat-resistant filter according to claim 16, wherein said second air-permeable partition is formed of a woven metal wire.
Claim 20
Dependent Claim
41 words
A heat-resistant filter according to claim 17, wherein said tube body is formed of a porous plate disposed relative to the second air permeable partition for location downstream of the latter when the filter is installed in the exhaust gas passage.
Claim 21
Dependent Claim
17 words
A heat-resistant filter according to claim 18, further including a cover tube arranged outside the filter body.
Claim 22
Dependent Claim
125 words
A heat-resistant filter for use in an exhaust gas passage in communication with an engine to collect particulate contained in exhaust gas, said filter comprising: a filter layer of randomly disposed heat-resistant fibers; a filter body having first and second air-permeable partitions formed in a tube shape and concentrically disposed facing each other with said filter layer therebetween; said first air-permeable partition being disposed relative to said second partition for location upstream of the latter when the filter is installed in said exhaust gas passage, and wherein said first partition includes a planar fabric made of electrically non-conductive heat resistant fibers; said second air-permeable partition being formed of a woven metal wire; and an electrical heat-generating member disposed close to and along said first partition.
Claim 23
Dependent Claim
125 words
A heat-resistant filter for use in an exhaust gas passage in communication with an engine to collect particulate contained in exhaust gas, said filter comprising: a filter layer of randomly disposed heat-resistant fibers; a filter body having first and second air-permeable partitions formed in a tube shape and concentrically disposed facing each other with said filter layer therebetween; said first air-permeable partition being disposed relative to said second partition for location upstream of the latter when the filter is installed in said exhaust gas passage, and wherein said first partition includes a planar fabric made of electrically non-conductive heat resistant fibers; said second air-permeable partition being formed of a woven metal wire; and an electrical heat-generating member disposed close to and along said first partition.
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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) | 1998-10-02 | 1999-04-03 | 1999-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-02 | 2003-04-03 | 2003-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-02 | 2007-04-03 | 2007-10-03 | $7700.00 | Window Closed / Lapsed |