Patent US4145652A successfully refreshed from Google Patents.
Patent US3434293A successfully refreshed from Google Patents.
US3434293A
Expired / Lapsed
US
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Floatable base for marine drilling platform and method of operation
Assignee: Baker Hughes Holdings LLC
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Filing: 1967-05-08
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Granted: 1969-03-25
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Expires: 1987-05-08
Abstract
No abstract record available.
Inventors
- 👤 Cicero C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:44
CPC Classifications
E; E21; E21B; E21B15/00; E21B15/02; B; B63; B63B; B63B1/00; B63B1/02; B63B1/10; B63B1/107; B63B35/00; B63B35/44; B63B35/4413; E21B15/003; E21B33/00; E21B33/10; E21B33/13; E21B33/134; B63B1/04; B63B2001/044
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) | 1972-03-24 | 1972-09-23 | 1973-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-24 | 1976-09-23 | 1977-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-24 | 1980-09-23 | 1981-03-25 | $7700.00 | Window Closed / Lapsed |