US3381753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid flow control system for wells
Assignee: Otis Engineering Corp
•
Filing: 1965-09-20
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Granted: 1968-05-07
•
Expires: 1985-09-20
Abstract
No abstract record available.
Inventors
- 👤 John V Fredd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:20
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/14; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2564; Y10T137/2567
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US730085A
Cited
US1861332A
Cited
US3132694A
Cited
US3216502A
Cited
US3130782A
Cited
US3151624A
Cited
US3263753A
Cited
US3302721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-07 | 1971-11-06 | 1972-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-07 | 1975-11-06 | 1976-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-07 | 1979-11-06 | 1980-05-07 | $7700.00 | Window Closed / Lapsed |