US2424657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid level control device for pumping units
Assignee: Individual
•
Filing: 1944-04-03
•
Granted: 1947-07-29
•
Expires: 1964-04-03
Abstract
No abstract record available.
Inventors
- 👤 Goodman Harry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:32
CPC Classifications
F; F04; F04D; F04D15/00; F04D15/02; F04D15/0209; F04D15/0218
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1887609A
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US1942241A
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US2110313A
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US2178811A
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US2096297A
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GB449453A
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US2249994A
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US2297680A
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US2303716A
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US2318066A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-28 | 1951-01-27 | 1951-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-28 | 1955-01-27 | 1955-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-28 | 1959-01-27 | 1959-07-29 | $7700.00 | Window Closed / Lapsed |