US2707440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well pump control system
Assignee: Shell Development Co
•
Filing: 1951-07-21
•
Granted: 1955-05-03
•
Expires: 1971-07-21
Abstract
No abstract record available.
Inventors
- 👤 Marion V Long
- 👤 Schneider Frederick Carl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:28
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/02; F04B49/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US868464A
Cited
US2550093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-05-02 | 1958-11-01 | 1959-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-05-02 | 1962-11-01 | 1963-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-05-02 | 1966-11-01 | 1967-05-03 | $7700.00 | Window Closed / Lapsed |