US5510086A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adcat exhaust treatment device
Assignee: Motors Liquidation Co
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Filing: 1995-04-10
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Granted: 1996-04-23
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Expires: 2015-04-10
Abstract
Abstract The invention relates to a catalytic converter system for controlling exhaust emissions from a combustion engine wherein the catalytic converter has three catalysts zones. A zone which is first in line with the direction of the flow of exhaust and which includes a light-off catalyst such as palladium. A second zone in line of the direction of the exhaust flow includes a hydrocarbon adsorber/catalyst. A third zone in line of the direction of the exhaust flow includes a catalyst system converter CO and NO x . The three-zone system of the present invention produces hydrocarbon efficiencies above 98 percent and retains hydrocarbon efficiencies above 50 percent in cold performance situations immediately after start-up of the combustion engine.
Inventors
- 👤 Mark D. Hemingway
- 👤 George A. English
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:01
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01D53/9481; F; F01; F01N; F01N13/00; F01N13/009; F01N13/0097; F01N3/00; F01N3/08; F01N3/0807; F01N3/0814; F01N3/0828; F01N3/0835; F01N3/10; F01N3/24; F01N3/28; F01N3/2803; F01N2250/00; F01N2250/12; F01N2510/00; F01N2510/06; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
101 words
A catalytic converter system for controlling vehicle exhaust emissions comprising: a catalyst package comprising a substrate; said substrate having first, second and third catalytic zones positioned respectively within the direction of exhaust flow traveling through the catalyst system; said zones being defined within said substrate by different coatings on said substrate, said first zone having a light-off catalyst coating said second zone having an adsorber/catalyst coating for adsorption of hydrocarbon, said third zone having a catalyst coating for converting CO and No x constituents in the exhaust flow, and said second zone being immediately adjacent to said first and third zones.
Claim 2
Dependent Claim
101 words
A catalytic converter system for controlling vehicle exhaust emissions comprising: a catalyst package comprising a substrate; said substrate having first, second and third catalytic zones positioned respectively within the direction of exhaust flow traveling through the catalyst system; said zones being defined within said substrate by different coatings on said substrate, said first zone having a light-off catalyst coating said second zone having an adsorber/catalyst coating for adsorption of hydrocarbon, said third zone having a catalyst coating for converting CO and No x constituents in the exhaust flow, and said second zone being immediately adjacent to said first and third zones.
Claim 3
Dependent Claim
17 words
A catalytic converter system as set forth in claim 1 wherein said light-off catalyst coating comprises palladium.
Claim 4
Dependent Claim
27 words
A catalytic converter system as set forth in claim 1 wherein said adsorber/catalyst coating comprises an adhered washcoat including a zeolite, for adsorption of hydrocarbon, and palladium.
Claim 5
Dependent Claim
40 words
A catalytic converter system as set forth in claim 1 wherein said third zone comprising the catalyst coating for controlling CO and No x exhaust constituents comprises platinum and rhodium wherein the platinum:rhodium rate ratio ranges from 5:1 to 10:1.
Claim 6
Dependent Claim
38 words
A catalytic converter system as set forth in claim 2 wherein said first zone is constructed and arranged to create a heat wave sufficient to prevent hydrocarbons collected in the second zone from desorbing during warmer performance situations.
Claim 7
Dependent Claim
27 words
A catalytic converter system as set forth in claim 2 wherein said palladium is coated on said substrate in an amount greater than 150 grams/ft 3 .
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-23 | 1999-10-23 | 2000-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-23 | 2003-10-23 | 2004-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-23 | 2007-10-23 | 2008-04-23 | $7700.00 | Window Closed / Lapsed |