US3767764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for removing nitrogen oxide from automotive exhaust
Assignee: WR Grace and Co Conn
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Filing: 1971-12-09
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Granted: 1973-10-23
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Expires: 1991-12-09
Abstract
Abstract A PROCESS FOR REMOVING CARBON MONXIDE, HYDROCARBONS AND NITROGEN OXIDES FROM THE EXHAUST STREAM OF INTERNAL COMBUSTION ENGINES BY PASSING T HE EXHAUST GAS THROUGH A CATALYST FOR CONVERSION OF CO TO CARBON DIOXIDE AND NITROGEN OXIDES TO AMMONIA, FOLLOWED BY ADMIXING THE EFFLUENT FROM THE CATALYST WITH A SECOND EXHAUST GAS STREAM DILUTED WITH AIR, AND PASSING THIS COMBINED EFFLUENT THROUGH A SECOND CATALYTIC CONVERTOR, W HEREIN THE AMMONIA AND NITROGEN OXIDES REACT TO FORM NITROGEN, AND THE CO AND HYDROCARBONS ARE CONVERTED TO INNOCUOUS ENTITIES.
Inventors
- 👤 G Dolbear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:32
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/944; B01D53/9459; B01D53/9477; F01N13/00; F01N13/009; B01D2251/00; B01D2251/10; B01D2251/102; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1023; B01D2255/20; B01D2255/207; B01D2255/2073; B01D2255/20746; B01D2255/20761; F01N2570/00; F01N2570/14; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 0
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |