US3512493A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable buoyancy lift device
Assignee: United States Department of the Navy
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Filing: 1968-04-23
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Granted: 1970-05-19
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Expires: 1988-04-23
Abstract
No abstract record available.
Inventors
- 👤 Lawrence William Hallanger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:06
CPC Classifications
B; B63; B63C; B63C7/00; B63C7/06; B63C7/10
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) | 1973-05-18 | 1973-11-17 | 1974-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-18 | 1977-11-17 | 1978-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-18 | 1981-11-17 | 1982-05-19 | $7700.00 | Window Closed / Lapsed |