US2526388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Closed circuit fluid apparatus for deep well pumping with counterbalance cylinder
Assignee: RALPH E COTTER JR
•
Filing: 1945-07-30
•
Granted: 1950-10-17
•
Expires: 1965-07-30
Abstract
No abstract record available.
Inventors
- 👤 Miller William Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:36
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/02; F04B47/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US386116A
Cited
US402229A
Cited
US496294A
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US560934A
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US572963A
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US206018A
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US1044379A
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US1206405A
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FR606576A
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GB242162A
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US1714528A
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US2168806A
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US2162748A
Cited
GB519099A
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US2180366A
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US2258103A
Cited
US2312337A
Cited
US2347302A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-10-16 | 1954-04-17 | 1954-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-16 | 1958-04-17 | 1958-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-16 | 1962-04-17 | 1962-10-17 | $7700.00 | Window Closed / Lapsed |