US2583111A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valved piston for deep-well lift pumps
Assignee: Individual
•
Filing: 1949-04-04
•
Granted: 1952-01-22
•
Expires: 1969-04-04
Abstract
No abstract record available.
Inventors
- 👤 Leonard C Mardis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:24
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/14; F04B53/143; F04B53/10; F04B53/12; F04B53/125; F04B53/126
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US337496A
Cited
US1116467A
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US1204087A
Cited
US1445363A
Cited
US1516534A
Cited
US1523161A
Cited
US1956868A
Cited
US2087590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-21 | 1955-07-23 | 1956-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-21 | 1959-07-23 | 1960-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-21 | 1963-07-23 | 1964-01-22 | $7700.00 | Window Closed / Lapsed |