US3883444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auto exhaust catalyst
Assignee: WR Grace and Co
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Filing: 1973-04-11
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Granted: 1975-05-13
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Expires: 1993-04-11
Abstract
Abstract This invention is a catalytic system for internal combustion engines. More specifically, this invention is a catalytic system which comprises cobalt oxide and optionally additional oxides of nickel, promoted with palladium and supported on a suitable support material as a catalyst for nitrogen oxide conversion.
Inventors
- 👤 James M Maselli
- 👤 Gwan Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:56
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01D53/9404; B01D53/9409; B01D53/9413; B01J; B01J23/00; B01J23/70; B01J23/89; B01J23/892; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1023; B01D2255/20; B01D2255/207; B01D2255/20746; B01D2255/20753; B01D2255/90; B01D2255/92; B01D2255/9207; B01J2235/00; B01J2235/15; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
40 words
A COMPOSITION USEFUL AS AN INTERNAL COMBUSTION ENGINE EXHAUST CATALYST WHICH COMPRISES 4-20 WEIGHT PERCENT COBALT OXIDE, 0.1-15 WEIGHT PERCENT NICKEL OXIDE, 0.005-0.1 WEIGHT PERCENT PALLADIUM AND THE REMAINDER BEING SUPPORT MATERIAL SUCH THAT THE TOTAL WEIGHT PERCENT EQUAL 100.
Claim 2
Dependent Claim
40 words
A COMPOSITION USEFUL AS AN INTERNAL COMBUSTION ENGINE EXHAUST CATALYST WHICH COMPRISES 4-20 WEIGHT PERCENT COBALT OXIDE, 0.1-15 WEIGHT PERCENT NICKEL OXIDE, 0.005-0.1 WEIGHT PERCENT PALLADIUM AND THE REMAINDER BEING SUPPORT MATERIAL SUCH THAT THE TOTAL WEIGHT PERCENT EQUAL 100.
Claim 3
Dependent Claim
38 words
The composition according to claim 1 wherein said catalyst is 4-12 weight percent cobalt oxide, 2-12 weight percent nickel oxide, 0.01-0.06 weight percent palladium and the remainder being support material such that the total weight percent equals 100.
Claim 4
Dependent Claim
20 words
The composition according to claim 1 wherein said support is magnesium aluminate spinel having a surface area of 20-200 m2/gm.
Claim 5
Dependent Claim
19 words
The composition according to claim 1 wherein said support material is mullite having a surface area of 20-200 m2gm.
Claim 6
Dependent Claim
54 words
An article of manufacture useful as an internal combustion engine exhaust catalyst comprising a ceramic monolithic structure impregnated with a catalytic component consisting essentially of 4-20 weight percent cobalt oxide, 0-15 weight percent nickel oxide, and 0.01 to 0.06 weight percent palladium, said weight percent being based on the weight of the monolithic structure.
Claim 7
Dependent Claim
54 words
An article of manufacture useful as an internal combustion engine exhaust catalyst comprising a ceramic monolithic structure impregnated with a catalytic component consisting essentially of 4-20 weight percent cobalt oxide, 0-15 weight percent nickel oxide, and 0.01 to 0.06 weight percent palladium, said weight percent being based on the weight of the monolithic structure.
Claim 8
Dependent Claim
14 words
The article according to claim 5 wherein said ceramic structure consists essentially of mullite.
Claim 9
Dependent Claim
61 words
The article according to claim 5 wherein said monolithic structure contains a coating of a composition of stabilized transitional alumina, said composition comprising a transitional alumina and 0.1-10 percent by weight of at least one rare earth metal oxide, said weight percent being based on the weight of the alumina, said coating being between said monolithic structure and the catalytic component.
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) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |