Patent US2674988A successfully refreshed from Google Patents.
US2674988A
Expired / Lapsed
US
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Internal-combustion engine
Assignee: Motors Liquidation Co
•
Filing: 1951-11-10
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Granted: 1954-04-13
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Expires: 1971-11-10
Abstract
No abstract record available.
Inventors
- 👤 Ronald K Evans
- 👤 Margaret W Manning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:58
CPC Classifications
F; F02; F02F; F02F1/00; F02F1/004; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49236; Y10T29/49826; Y10T29/49863
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |