US2625882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumping mechanism
Assignee: Individual
•
Filing: 1945-01-13
•
Granted: 1953-01-20
•
Expires: 1965-01-13
Abstract
No abstract record available.
Inventors
- 👤 James E Davis
- 👤 Sandhofer Rena
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:18
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/126
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US42686A
Cited
US50911A
Cited
US620041A
Cited
US1665639A
Cited
US1616201A
Cited
US1723682A
Cited
US2281899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-01-20 | 1956-07-21 | 1957-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-20 | 1960-07-21 | 1961-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-20 | 1964-07-21 | 1965-01-20 | $7700.00 | Window Closed / Lapsed |