Patent US4934142A successfully refreshed from Google Patents.
US4934142A
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US
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Exhaust emission control device for a diesel engine
Assignee: Toyota Motor Corp
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Filing: 1988-12-07
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Granted: 1990-06-19
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Expires: 2008-12-07
Abstract
Abstract An exhaust emission gas control device having a first filter trapping particulates contained in an exhaust gas, and a second filter removing offensive odor components in the exhaust gas. The first filter is a honeycomb type having a cordierite substrate on which τ-alumina is coated. The second filter is provided downstream of the first filter, and is formed by an ion-exchange of copper on a synthetic zeolite rich in silica to form copper ions thereon.
Inventors
- 👤 Kotaro Hayashi
- 👤 Tokuta Inoue
- 👤 Sumio Ito
- 👤 Kiyoshi Kobashi
- 👤 Shinichi Takeshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:16
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9481; B01D53/9459; B01D53/9463; B01D53/9472; F; F01; F01N; F01N3/00; F01N3/02; F01N3/021; F01N3/023; F01N3/027; F01N3/031; F01N3/033; F01N3/08; F01N3/0807; F01N3/0828; F01N3/0835; F01N3/0871; F01N3/0878; F01N3/10; F01N3/18; F01N3/20; F01N3/24; F01N3/28; F01N3/2882; B01D2255/00; B01D2255/20; B01D2255/207; B01D2255/20761; B01D2255/50; B01D2257/00; B01D2257/90; B01D2258/00; B01D2258/01; B01D2258/012; F01N2240/00; F01N2240/18; F01N2250/00; F01N2250/02; F01N2250/12; F01N2250/14; F01N2330/00; F01N2330/06; F01N2370/00; F01N2370/22; F01N2370/24; F01N2390/00; F01N2390/02; F01N2410/00; F01N2410/04; F01N2410/12; F01N2510/00; F01N2510/12; F01N2570/00; F01N2570/04; F01N2570/08; F02; F02B; F02B3/00; F02B3/06; Y; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
95 words
An exhaust emission control device for a diesel engine comprising: a housing for placement in the exhaust system of the diesel engine; a first filter arranged in the housing for trapping particulates in the exhaust gas, the first filter extending across the entire cross-section of the housing; a second filter in the housing adjacent the first filter for absorbing offensive odor components of the housing, exhaust gas and extending across the entire cross section of the housing, the second filter being formed of a zeolite carrying copper ions formed by an ion-exchange of copper thereon.
Claim 2
Dependent Claim
95 words
An exhaust emission control device for a diesel engine comprising: a housing for placement in the exhaust system of the diesel engine; a first filter arranged in the housing for trapping particulates in the exhaust gas, the first filter extending across the entire cross-section of the housing; a second filter in the housing adjacent the first filter for absorbing offensive odor components of the housing, exhaust gas and extending across the entire cross section of the housing, the second filter being formed of a zeolite carrying copper ions formed by an ion-exchange of copper thereon.
Claim 3
Dependent Claim
22 words
An exhaust emission control device according to claim 1, wherein said first filter is a honeycomb type filter having a cordierite substrate.
Claim 4
Dependent Claim
41 words
An exhaust emission control device according to claim 2, wherein said cordierite substrate is made by alternatively disposing first porous cells having inlet portions which are closed by plugs, and second porous cells having outlet portions which are closed by plugs.
Claim 5
Dependent Claim
17 words
An exhaust emission control device according to claim 3, wherein said cordierite substrate is coated with τ-alumina.
Claim 6
Dependent Claim
28 words
An exhaust emission control device according to claim 4, wherein said τ-alumina carries a catalyst to lower a temperature used for igniting particulates trapped in said first filter.
Claim 7
Dependent Claim
20 words
An exhaust emission control device according to claim 1, wherein said second filter is formed of a monolith type ceramic.
Claim 8
Dependent Claim
19 words
An exhaust emission control device according to claim 1, wherein said zeolite is a synthetic zeolite rich in silica.
Claim 9
Dependent Claim
22 words
An exhaust emission control device according to claim 1, wherein said copper ions are carried on the entire surface of said zeolite.
Claim 10
Dependent Claim
24 words
An exhaust emission control device according to claim 1, wherein said copper ions are carried on a part of the surface of said zeolite.
Claim 11
Dependent Claim
27 words
An exhaust emission control device according to claim 1, wherein the cross-sectional area of said first filter is substantially the same as that of said second filter.
Claim 12
Dependent Claim
59 words
An exhaust emission control device according to claim 1, further comprising means for forming a normal gas flow path first through said first filter and then through said second filter, and to form a regeneration gas flow path wherein at least a portion of the exhaust gas passes first through said second filter and then through said first filter.
Claim 13
Dependent Claim
25 words
An exhaust emission control device according to claim 11, wherein an electric heater is arranged in said housing between said first filter and second filter.
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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) | 1993-06-18 | 1993-12-18 | 1994-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-18 | 1997-12-18 | 1998-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-18 | 2001-12-18 | 2002-06-19 | $7700.00 | Window Closed / Lapsed |