Patent US2551375A successfully refreshed from Google Patents.
US2551375A
Expired / Lapsed
US
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Submergible drilling barge and method of operation
Assignee: Individual
•
Filing: 1948-12-15
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Granted: 1951-05-01
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Expires: 1968-12-15
Abstract
No abstract record available.
Inventors
- 👤 John T Hayward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:19
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)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-30 | 1954-10-30 | 1955-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-30 | 1958-10-30 | 1959-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-30 | 1962-10-30 | 1963-05-01 | $7700.00 | Window Closed / Lapsed |