US2869469A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic pumping jack for oil wells
Assignee: Individual
•
Filing: 1954-03-31
•
Granted: 1959-01-20
•
Expires: 1974-03-31
Abstract
No abstract record available.
Inventors
- 👤 Williams Mary Jo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:31
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/08; Y; Y10; Y10S; Y10S417/00; Y10S417/904; Y10T; Y10T74/00; Y10T74/18; Y10T74/1804
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US644618A
Cited
US773501A
Cited
US1619474A
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US2073809A
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US2032952A
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US2136986A
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US2096562A
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US2568828A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-19 | 1962-07-21 | 1963-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-19 | 1966-07-21 | 1967-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-19 | 1970-07-21 | 1971-01-20 | $7700.00 | Window Closed / Lapsed |