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Patent US3434443A successfully refreshed from Google Patents.
US3434443A
Expired / Lapsed
US
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Underwater buoyancy transport vehicle
Assignee: United States Department of the Navy
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Filing: 1967-11-22
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Granted: 1969-03-25
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Expires: 1987-11-22
Abstract
No abstract record available.
Inventors
- 👤 Norman B Estabrook
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:43
CPC Classifications
B; B63; B63C; B63C11/00; B63C11/34; B63C11/36; B63C11/42; B63G; B63G8/00; B63G8/001; B63G2008/002; B63G2008/005; B63G2008/007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2981073A
Cited
US3356055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |