Patent US2918890A successfully refreshed from Google Patents.
US2918890A
Expired / Lapsed
US
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Submarine ballast door mechanism
Assignee: Cleveland Pneumatic Industries Inc
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Filing: 1958-03-20
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Granted: 1959-12-29
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Expires: 1978-03-20
Abstract
No abstract record available.
Inventors
- 👤 William A Gail
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:49
CPC Classifications
B; B63; B63G; B63G8/00; B63G8/14; B63G8/22
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) | 1962-12-28 | 1963-06-29 | 1963-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-12-28 | 1967-06-29 | 1967-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-12-28 | 1971-06-29 | 1971-12-29 | $7700.00 | Window Closed / Lapsed |