Patent US3474749A successfully refreshed from Google Patents.
US3474749A
Expired / Lapsed
US
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Floatable vessel
Assignee: Vickers Ltd
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Filing: 1968-02-28
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Granted: 1969-10-28
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Expires: 1988-02-28
Abstract
No abstract record available.
Inventors
- 👤 Robert Henry Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:03
CPC Classifications
B; B63; B63B; B63B35/00; B63B35/44; B63B35/4413; B63B1/00; B63B1/02; B63B1/04; B63B1/048; B63B21/00; B63B21/50; B63B2001/044
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3031997A
Cited
US3294051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |