Patent US3816401A successfully refreshed from Google Patents.
US3816401A
Expired / Lapsed
US
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Exhaust gas conversion process and catalyst
Assignee: Union Oil Company of California
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Filing: 1972-05-25
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Granted: 1974-06-11
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Expires: 1992-05-25
Abstract
Abstract PROCESS AND CATALYST FOR THE CATALYTIC CONVERSION OF NITROGEN OXIDES, UNBURNED HYDROCARBONS AND CARBON MONOOXIDE IN INTERNAL COMBUSTION ENGINE EXHAUST GASES. THE CATALYST COMPRISES ESSENTIALLY A COMPOSITE OF COPPER OXIDE AND IROON OXIDES WHICH HAS BEEN PRECALINED AT HIGH TEMPERATURES, BETWEEN ABOUT 1200* AND 2400*F. THE COMPOSITE CATALYST IS MORE ACTIVE THAN EITHER COMPONENT ALONE, AND MORE ACTIVE THAN THE SAME COMPOSITES CALCINED AT LOWER TEMPERATURES.
Inventors
- 👤 R Hansford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:26
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/08; B01J23/00; B01J23/70; B01J23/74; B01J23/745
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |