US3764564A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for control of automobile exhaust emissions
Assignee: WR Grace and Co Conn
•
Filing: 1972-05-11
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Granted: 1973-10-09
•
Expires: 1992-05-11
Abstract
Abstract A process for preparing an automotive exhaust catalyst capable of converting the carbon monoxide and hydrocarbons in automobile exhaust gas to carbon dioxide and water, characterized by high activity and exceptional resistance to shrinkage in use. The catalyst is prepared by impregnating or cladding nodules of a support with certain transition metal oxides. One of these oxides is impregnated into or clad onto the support and the support is calcined prior to addition of the other catalytic components to the nodules.
Inventors
- 👤 J Maselli
- 👤 M Ernest
- 👤 G Kim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:33
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/868; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
21 words
The process according to claim 1 wherein the manganese coating is applied to only to the outer periphery of the nodules.
Claim 2
Dependent Claim
17 words
The process according to claim 1 wherein the manganese coating is applied by impregnation into the nodules.
Claim 3
Dependent Claim
23 words
The process according to claim 1 wherein the manganese salt is selected from the group consisting of the chloride, nitrate, acetate, and sulfate.
References Cited (Backward Citations)
US3295918A
Cited
US3532457A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |