US3461958A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and apparatus for installation and removal of preventer stacks in offshore oil and gas wells
Assignee: Baker Hughes Holdings LLC
•
Filing: 1967-01-16
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Granted: 1969-08-19
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Expires: 1987-01-16
Abstract
No abstract record available.
Inventors
- 👤 Cicero C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:02
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/064
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3195638A
Cited
US3301322A
Cited
US3360042A
Cited
US3301324A
Cited
US3330339A
Cited
US3338305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-08-18 | 1973-02-17 | 1973-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-18 | 1977-02-17 | 1977-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-18 | 1981-02-17 | 1981-08-19 | $7700.00 | Window Closed / Lapsed |