Patent US3674441A successfully refreshed from Google Patents.
US3674441A
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US
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Exhaust emission control
Assignee: Motors Liquidation Co
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Filing: 1970-11-09
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Granted: 1972-07-04
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Expires: 1990-11-09
Abstract
Abstract INTERNAL COMBUSTION ENGINE EXHAUST GASES, PASSING UNCONVERTED THROUGH AN EXHAUST GAS CATALYTIC CONVERTER DURING THE WARM-UP PERIOD OF THE CATALYST BED, ARE DIRECTED TO A BED OF STORAGE MATERIAL WHICH SEPARATES AND RETAINS UNDESIRABLE CONSTITUENTS OF THE EXHAUST GASES. AFTER WARMUP OF THE CATALYST BED, THE RETAINED CONSTITUENTS ARE PURGED FROM THE STORAGE BED AND RECIRCULATED TO AND CONVERTED IN THE CATALYST BED. THE STORAGE BED SUPPLEMENTS THE EMISSION CONTROL OF THE CATALYST BED BY REDUCING EMISSION OF UNDESIRABLE EXHAUST GAS CONSTITUENTS DURING STARTING OF THE ENGINE AND WARM-UP OF THE CATALYST BED.
Inventors
- 👤 Edward N Cole
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:43
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/0807; F01N3/0871; F01N3/0878; F01N3/0828; F01N3/0835; F01N3/0842; F01N3/0857; F01N2240/00; F01N2240/26; F01N2250/00; F01N2250/12; F01N2410/00; F01N2410/12; F01N2570/00; F01N2570/12; F01N2570/14; F01N3/10; F01N3/18; F01N3/20; Y; Y02; Y02A; Y02A50/00; Y02A50/20
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |