Patent US2970447A successfully refreshed from Google Patents.
US2970447A
Expired / Lapsed
US
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Marine apparatus and method for raising and lowering same
Assignee: Jersey Production Research Co
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Filing: 1957-04-01
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Granted: 1961-02-07
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Expires: 1977-04-01
Abstract
No abstract record available.
Inventors
- 👤 William A Castille
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:47
CPC Classifications
E; E02; E02B; E02B17/00; E02B17/04; E02B17/08; E02B17/0809; E02B17/02; E02B17/021; E02B2017/0056; E02B2017/0073; E02B2017/0086
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |