US2850256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laterally adjustable blowout preventer with inflatable rams
Assignee: Jersey Production Research Co
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Filing: 1955-11-10
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Granted: 1958-09-02
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Expires: 1975-11-10
Abstract
No abstract record available.
Inventors
- 👤 Robert R Crookston
- 👤 Jr Thomas J Bolling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:07
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/06; E21B33/061; E21B33/062
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) | 1961-09-01 | 1962-03-03 | 1962-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-01 | 1966-03-03 | 1966-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-01 | 1970-03-03 | 1970-09-02 | $7700.00 | Window Closed / Lapsed |