US3553961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion engine system
Assignee: Phillips Petroleum Co
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Filing: 1968-12-26
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Granted: 1971-01-12
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Expires: 1988-12-26
Abstract
Abstract A DUAL ENGINE SYSTEM IS PROVIDED IN WHICH THE EXHAUST FROM A PRIMARY ENGINE IS PASSED TO THE COMBUSTION ZONE OF A SECONDARY ENGINE TO REDUCE THE CONCENTRATION OF CARBON MONOXIDE, UNBURNED HYDROCARBONS AND NITROGEN OXIDES IN THE EXHAUST GASES DISCHARGED FROM THE SYSTEM.
Inventors
- 👤 Leo A Mcreynolds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:54
CPC Classifications
F; F02; F02B; F02B41/00; F02B75/00; F02B75/10; F02B73/00; F02M; F02M2700/00; F02M2700/34
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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |