Patent US3956459A successfully refreshed from Google Patents.
US3956459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the elimination of pollutants in exhaust gases
Assignee: Wyeth Holdings LLC
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Filing: 1974-01-28
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Granted: 1976-05-11
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Expires: 1994-01-28
Abstract
Abstract An improved process for oxidation of exhaust gases emanating from internal combustion engines which utilizes a stabilized alumina support containing a uniform distribution of cupric oxide and chromic oxide as a first promoter level and thereover palladium as a second promoter level as well as the process for manufacture thereof are disclosed.
Inventors
- 👤 Robert Henry Whitman
- 👤 Edward Leyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:55
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/89; B01J23/8933; B01J23/8993; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A process for treating exhaust gases from internal combustion engines to oxidize the air pollutants therein which comprises contacting said gases with catalyst material consisting essentially of an alumina support stabilized against excessive shrinkage by treatment with an alkaline earth metal compound and calcination at 1800°F., said support uniformly impregnated with from about 2 to 10 weight percent of cupric oxide and from about 2 to 10 weight percent of chromic oxide as a first promoter level and thereover from about 0.0025 to 0.1 weight percent of palladium as a second promoter level, said percentages being based on the weight of the stabilized support.
Claim 2
Dependent Claim
104 words
A process for treating exhaust gases from internal combustion engines to oxidize the air pollutants therein which comprises contacting said gases with catalyst material consisting essentially of an alumina support stabilized against excessive shrinkage by treatment with an alkaline earth metal compound and calcination at 1800°F., said support uniformly impregnated with from about 2 to 10 weight percent of cupric oxide and from about 2 to 10 weight percent of chromic oxide as a first promoter level and thereover from about 0.0025 to 0.1 weight percent of palladium as a second promoter level, said percentages being based on the weight of the stabilized support.
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) | 1979-05-11 | 1979-11-10 | 1980-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-11 | 1983-11-10 | 1984-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-11 | 1987-11-10 | 1988-05-11 | $7700.00 | Window Closed / Lapsed |