US3477526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling the pressure in a well
Assignee: Cooper Industries LLC
•
Filing: 1967-06-07
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Granted: 1969-11-11
•
Expires: 1987-06-07
Abstract
No abstract record available.
Inventors
- 👤 Marvin R Jones
- 👤 Benton F Baugh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:00
CPC Classifications
E; E21; E21B; E21B21/00; E21B21/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE26220E
Cited
US2786652A
Cited
US3268017A
Cited
US3372761A
Cited
US3338319A
Cited
US3362487A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |