US2907172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for constructing offshore drilling platforms
Assignee: Shell Development Co
•
Filing: 1955-09-19
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Granted: 1959-10-06
•
Expires: 1975-09-19
Abstract
No abstract record available.
Inventors
- 👤 Wilfred S Crake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:54
CPC Classifications
E; E02; E02B; E02B17/00; E02B17/02; E02B17/027; E02B2017/0039; E02B2017/0047
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2736172A
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US1873807A
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US2210408A
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US2364865A
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US2475933A
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US2817212A
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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) | 1962-10-05 | 1963-04-06 | 1963-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-05 | 1967-04-06 | 1967-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-05 | 1971-04-06 | 1971-10-06 | $7700.00 | Window Closed / Lapsed |