Patent US3012832A successfully refreshed from Google Patents.
US3012832A
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Free piston well pump device
Assignee: Camco Inc
•
Filing: 1958-05-12
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Granted: 1961-12-12
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Expires: 1978-05-12
Abstract
No abstract record available.
Inventors
- 👤 Donald G Knox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:52
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/12; E; E21; E21B; E21B37/00; E21B37/02; E21B37/04; E21B43/00; E21B43/12; E21B43/121
Claims Analysis
Total Claims: 0
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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) | 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 |