Patent US3470857A successfully refreshed from Google Patents.
US3470857A
Expired / Lapsed
US
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Internal combustion engine construction and method for improved operation with exhaust gas recirculation
Assignee: Motors Liquidation Co
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Filing: 1968-09-05
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Granted: 1969-10-07
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Expires: 1988-09-05
Abstract
No abstract record available.
Inventors
- 👤 Donald L Stivender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:17
CPC Classifications
F; F02; F02D; F02D21/00; F02D21/06; F02D21/08; F01; F01L; F01L13/00; F01L13/0015; F01L13/0021; F02B; F02B2275/00; F02B2275/34; F02B75/00; F02B75/16; F02B75/18; F02B75/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US928390A
Cited
US1265799A
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US3146768A
Cited
US3237615A
Cited
US3318292A
Cited
US3320928A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |