US2720836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air lift pump
Assignee: Individual
•
Filing: 1954-04-16
•
Granted: 1955-10-18
•
Expires: 1974-04-16
Abstract
No abstract record available.
Inventors
- 👤 Asa E Warren
- 👤 Schavet Maric Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:53
CPC Classifications
F; F04; F04F; F04F1/00; F04F1/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1653189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |