Patent US2491497A successfully refreshed from Google Patents.
US2491497A
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Engine pressure control system
Assignee: Motors Liquidation Co
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Filing: 1944-10-20
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Granted: 1949-12-20
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Expires: 1964-10-20
Abstract
No abstract record available.
Inventors
- 👤 Clarence H Jorgensen
- 👤 William H Taylor
- 👤 Frederick J Hardman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:08
CPC Classifications
F; F02; F02B; F02B33/00; F02M; F02M2700/00; F02M2700/33
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) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |