US3150596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Free piston well pump device
Assignee: Individual
•
Filing: 1961-10-10
•
Granted: 1964-09-29
•
Expires: 1981-10-10
Abstract
No abstract record available.
Inventors
- 👤 Donald G Knox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:05
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
IN A FREE PISTON PUMPING DEVICE FOR USE IN A WELL TUBING, THE COMBINATION OF: A PLUNGER HAVING A PASSAGE THERETHROUGH CLOSED BY AN UPWARD CLOSING VALVE, THE PLUNGER HAVING A BODY PROVIDED WITH MEANS FOR SLIDABLY CONTACTING THE INTERIOR OF THE TUBING, WHEREBY THE PLUNGER MAY BE RAISED IN THE WELL TUBING BY FLUID PRESSURE BELOW IT, A SINKER BAR FIXED AGAINST AXIAL MOVEMENT RELATIVE TO THE BODY AND EXTENDING DOWNWARD THEREFROM, AND A HELICAL FIN ON THE SINKER BAR.
Claim 2
Dependent Claim
81 words
IN A FREE PISTON PUMPING DEVICE FOR USE IN A WELL TUBING, THE COMBINATION OF: A PLUNGER HAVING A PASSAGE THERETHROUGH CLOSED BY AN UPWARD CLOSING VALVE, THE PLUNGER HAVING A BODY PROVIDED WITH MEANS FOR SLIDABLY CONTACTING THE INTERIOR OF THE TUBING, WHEREBY THE PLUNGER MAY BE RAISED IN THE WELL TUBING BY FLUID PRESSURE BELOW IT, A SINKER BAR FIXED AGAINST AXIAL MOVEMENT RELATIVE TO THE BODY AND EXTENDING DOWNWARD THEREFROM, AND A HELICAL FIN ON THE SINKER BAR.
References Cited (Backward Citations)
US2172636A
Cited
US1516479A
Cited
US1943533A
Cited
US1947587A
Cited
US2267902A
Cited
US2642002A
Cited
US2970547A
Cited
US3044414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-29 | 1968-03-30 | 1968-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-29 | 1972-03-30 | 1972-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-29 | 1976-03-30 | 1976-09-29 | $7700.00 | Window Closed / Lapsed |