US3983072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust catalyst
Assignee: Ethyl Corp
•
Filing: 1973-04-16
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Granted: 1976-09-28
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Expires: 1993-04-16
Abstract
Abstract Engine exhaust gas is rendered less noxious by contact with a catalyst consisting essentially of manganese oxide and palladium on a suitable support such as alumina. Optionally, the support may be precoated with a rare earth metal oxide to improve catalyst hardness.
Inventors
- 👤 Ruth E. Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:15
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/64; B01J23/656; B01J23/6562; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
53 words
A catalyst especially adapted for use over an extended period in lowering the hydrocarbon and carbon monoxide content of exhaust gas emitted by an internal combustion engine operating on gasoline containing a tetraalkyl lead antiknock agent, said catalyst consisting essentially of about 0.1-20 weight per cent manganese in an oxide form and 0.005-0.3
Claim 2
Dependent Claim
53 words
A catalyst especially adapted for use over an extended period in lowering the hydrocarbon and carbon monoxide content of exhaust gas emitted by an internal combustion engine operating on gasoline containing a tetraalkyl lead antiknock agent, said catalyst consisting essentially of about 0.1-20 weight per cent manganese in an oxide form and 0.005-0.3
Claim 3
Dependent Claim
13 words
A catalyst of claim 1 wherein said support is a high surface monolithic
Claim 4
Dependent Claim
13 words
A catalyst of claim 3 wherein said alumina support is precoated with a
Claim 5
Dependent Claim
23 words
A catalyst of claim 4 wherein said rare earth metal oxide consists mainly of an oxide selected from lanthanum oxide, praseodymium oxide and
Claim 6
Dependent Claim
15 words
A catalyst of claim 5 containing 1 to 20 weight per cent manganese in an
Claim 7
Dependent Claim
13 words
A catalyst of claim 3 wherein said support is precoated with a mixture
Claim 8
Dependent Claim
21 words
A catalyst of claim 7 wherein the atom ratio of said rare earth metal to aluminum in said precoat is 1:8-20.
References Cited (Backward Citations)
US2742437A
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US3295918A
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US3498927A
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US3545917A
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US3524721A
Cited
US3770659A
Cited
US3776859A
Cited
US3764564A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-28 | 1980-03-29 | 1980-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-28 | 1984-03-29 | 1984-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-28 | 1988-03-29 | 1988-09-28 | $7700.00 | Window Closed / Lapsed |