US3012512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free piston well pump assembly
Assignee: Camco Inc
•
Filing: 1957-02-15
•
Granted: 1961-12-12
•
Expires: 1977-02-15
Abstract
No abstract record available.
Inventors
- 👤 William A Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:56
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1919548A
Cited
US2001552A
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US2231158A
Cited
US2503089A
Cited
US2642002A
Cited
US2762309A
Cited
US2746395A
Cited
US2649738A
Cited
US2757614A
Cited
US2918015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-12-11 | 1965-06-12 | 1965-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-11 | 1969-06-12 | 1969-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-11 | 1973-06-12 | 1973-12-12 | $7700.00 | Window Closed / Lapsed |