US2983227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure operated engine for well pumps
Assignee: Individual
•
Filing: 1959-06-15
•
Granted: 1961-05-09
•
Expires: 1979-06-15
Abstract
No abstract record available.
Inventors
- 👤 Charles L English
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:29
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/02; F04B47/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US437806A
Cited
US585083A
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US825950A
Cited
US2134174A
Cited
US2631572A
Cited
US2631541A
Cited
US2751889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |