US3701823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and means for two-stage catalytic treating of engine exhaust gases
Assignee: Universal Oil Products Co
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Filing: 1970-09-02
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Granted: 1972-10-31
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Expires: 1990-09-02
Abstract
Abstract A TWO-STAGE CATALYTIC TREATMENT OF ENGINE EXHAUSET GASES BY PASSING THEHOT GAS STREAM WITHOUT COOLING AND WITHOUT ADDED AIR THROUGH A FIRST CATALYST SECTION TO EFFECT REDUCTION OF NITROGEN OXIDES AND THEN MIXING AIR WITH THE RESULTING STREAM FOR PASSAGE THROUGH A SECOND STAGE CATALYST SECTION SO AS TO EFFECT MORE COMPLETE OXIDATION OF CO AND UNBRUNED HYDROCARBONS. A PREFERRED APPARATUS IS BULIT TO HAVE THE SECOND CATALYST STATE ALONG SIDE OF AND IN HEAT-EXCHANGE RELATIONSHIP WITH THE FIRST STAGE SO AS TO ASSIT IN MAINTAINING A HIGH TEMPERATUE FIRST CATALYTIC REDUCTION SECTION.
Inventors
- 👤 Leslie C Hardison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:43
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/30; F01N3/34; B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/944; B01D53/9459; B01D53/9463; B01D53/9472; F01N13/00; F01N13/009; F01N13/0097; F01N3/28; F01N3/2803; F01N3/2832; F01N3/2835; F01N3/2839; F01N3/2846; F01N3/285; F01N3/2892; B01D2251/00; B01D2251/10; B01D2251/102; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1021; B01D2255/1023; B01D2255/20; B01D2255/207; B01D2255/20723; B01D2255/20761; B01D2255/20784; F01N13/14; F01N2330/00; F01N2330/08; F01N2330/10; F01N2470/00; F01N2470/18; F01N2470/22; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |