Patent US2874641A successfully refreshed from Google Patents.
US2874641A
Expired / Lapsed
US
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Pump jack
Assignee: Recovery Oil & Gas Co Inc
•
Filing: 1955-04-25
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Granted: 1959-02-24
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Expires: 1975-04-25
Abstract
No abstract record available.
Inventors
- 👤 Albanis P Mccandlish
- 👤 William T Tallon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:15
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/02; F04B47/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1619475A
Cited
US2033210A
Cited
US2139101A
Cited
US2572748A
Cited
US2651914A
Cited
US2582564A
Cited
US2726512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-23 | 1962-08-25 | 1963-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-23 | 1966-08-25 | 1967-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-23 | 1970-08-25 | 1971-02-24 | $7700.00 | Window Closed / Lapsed |