Patent US2862448A successfully refreshed from Google Patents.
US2862448A
Expired / Lapsed
US
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Fluid operated well pumps
Assignee: Individual
•
Filing: 1957-07-29
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Granted: 1958-12-02
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Expires: 1977-07-29
Abstract
No abstract record available.
Inventors
- 👤 Howard F Belding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:07
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/02; F04B47/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1414990A
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US1565886A
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US1775759A
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US2022781A
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US2491587A
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US2780171A
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US2837029A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |