US3784675A
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Process for reducing the content of nitrogen oxides in the exhaust gases from internal combustion engines
Assignee: Chevron USA Inc
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Filing: 1971-12-13
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Granted: 1974-01-08
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Expires: 1991-12-13
Abstract
Abstract A METHOD IS PROPOSED FOR THE REDUCTION OF NITROGEN OXIDES IN EXHAUST GASES FROM INTERNAL COMBUSTION ENGINES TO SELECTIVELY FORM NITROGEN AS SUBSTANTIALLY THE ONLY NITROGEN-CONTAINING PRODUCT. THE METHOD COMPRISES CONTACTING AN EXHAUST GAS FROM AN INTERNAL COMBUSTION ENGINE AT AN ELEVATED TEMPERATURE IN A REDUCING ATMOSPHERE WITH ABOUT 0.003 TO ABOUT 0.5 TROY OUNCE OF RUTHENIUM PER 1000 CUBIC FEET OF EXHAUST GAS PER HOUR.
Inventors
- 👤 T Kobylinski
- 👤 B Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:36
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/9459; B01D53/9477; B01D2251/00; B01D2251/10; B01D2251/102; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1026; B01D2255/90; B01D2255/92; B01D2255/9207; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/46; B01J23/462
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |