US2650574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid lift pumping equipment
Assignee: Individual
•
Filing: 1947-08-04
•
Granted: 1953-09-01
•
Expires: 1967-08-04
Abstract
No abstract record available.
Inventors
- 👤 Donald A Macdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:42
CPC Classifications
F; F04; F04B; F04B47/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
US1816829A
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US1898694A
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US2016654A
Cited
US2001620A
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US2133708A
Cited
US2139101A
Cited
GB485617A
Cited
US2246535A
Cited
US2185448A
Cited
US2279057A
Cited
US2363142A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-31 | 1957-03-02 | 1957-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-31 | 1961-03-02 | 1961-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-31 | 1965-03-02 | 1965-09-01 | $7700.00 | Window Closed / Lapsed |