US3224831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating engine exhaust gas with an oxidation catalyst containing platinum and phosphorus
Assignee: Ethyl Corp
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Filing: 1961-07-12
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Granted: 1965-12-21
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Expires: 1981-07-12
Abstract
No abstract record available.
Inventors
- 👤 Ruth E Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:45
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/185; B01J27/1856; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/92; B01D53/94; B01D53/944; B01J23/00; B01J23/38; B01J23/40; B01J23/42; B01J21/00; B01J21/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A METHOD OF SUBSTANTIALLY OXIDIZING THE UNBURNED HYDROCARBON AND CARBON MONOXIDE CONSTITUENTS OF THE EXHAUST GAS OF INTERNAL COMBUSTION ENGINES, SAID METHOD COMPRISING CONTACTING SAID EXHAUST GAS IN THE PRESENCE OF OXYGEN WITH AN EXHAUST GAS OXIDATION CATALYST PREPARED BY (A) IMPREGNATING AN ALUMINA CARRIER WITH FROM 0.003 TO 5 PERCENT BY WEIGHT OF PLATINUM AS A COMPOUND OF PLATINUM AND WITH FROM ABOUT 1 TO 15 PERCENT, BASED ON THE WEIGHT OF SAID CARRIER, OF A PHOSPHORUS COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE ACIDS OF PHOSPHORUS AND AMMONIUM PHOSPHATE, AND (B) HEATING THE RESULTANT MATERIAL TO A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 300-100*C.
Claim 2
Independent Claim
108 words
A METHOD OF SUBSTANTIALLY OXIDIZING THE UNBURNED HYDROCARBON AND CARBON MONOXIDE CONSTITUENTS OF THE EXHAUST GAS OF INTERNAL COMBUSTION ENGINES, SAID METHOD COMPRISING CONTACTING SAID EXHAUST GAS IN THE PRESENCE OF OXYGEN WITH AN EXHAUST GAS OXIDATION CATALYST PREPARED BY (A) IMPREGNATING AN ALUMINA CARRIER WITH FROM 0.003 TO 5 PERCENT BY WEIGHT OF PLATINUM AS A COMPOUND OF PLATINUM AND WITH FROM ABOUT 1 TO 15 PERCENT, BASED ON THE WEIGHT OF SAID CARRIER, OF A PHOSPHORUS COMPOUND SELECTED FROM THE GROUP CONSISTING OF THE ACIDS OF PHOSPHORUS AND AMMONIUM PHOSPHATE, AND (B) HEATING THE RESULTANT MATERIAL TO A TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 300-100*C.
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) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |