Patent US2783027A successfully refreshed from Google Patents.
US2783027A
Expired / Lapsed
US
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Method and apparatus for submerged well drilling
Assignee: Shell Development Co
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Filing: 1954-04-20
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Granted: 1957-02-26
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Expires: 1974-04-20
Abstract
No abstract record available.
Inventors
- 👤 Walton E Gilbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:44
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1871034A
Cited
US1829304A
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US2336977A
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US2476309A
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US2606003A
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US2676787A
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US2644669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-26 | 1960-08-27 | 1961-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-26 | 1964-08-27 | 1965-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-26 | 1968-08-27 | 1969-02-26 | $7700.00 | Window Closed / Lapsed |