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Patent US2740261A successfully refreshed from Google Patents.
US2740261A
Expired / Lapsed
US
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Floating hulls for off shore oil well drilling
Assignee: Individual
•
Filing: 1950-11-06
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Granted: 1956-04-03
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Expires: 1970-11-06
Abstract
No abstract record available.
Inventors
- 👤 Alexander D Stark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:45
CPC Classifications
E; E02; E02B; E02B17/00; E02B17/04; E02B17/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2308743A
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US2515540A
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US2589146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |