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Patent US2940266A successfully refreshed from Google Patents.
US2940266A
Expired / Lapsed
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Method of constructing an offshore well drilling island
Assignee: SHAMROCK DRILLING CO
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Filing: 1956-07-30
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Granted: 1960-06-14
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Expires: 1976-07-30
Abstract
No abstract record available.
Inventors
- 👤 Smith Verne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:40
CPC Classifications
E; E02; E02B; E02B17/00; E02B17/02; E02B17/027; E02B2017/0039
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US360273A
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US2736172A
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US1489428A
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US2317016A
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US2472869A
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US2574140A
Cited
US2628818A
Cited
US2579703A
Cited
US2771747A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |