US3606591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump and driving motor assembly
Assignee: Individual
•
Filing: 1969-10-08
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Granted: 1971-09-20
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Expires: 1989-10-08
Abstract
Abstract A PUMP IS DRIVEN BY AN INTERNAL COMBUSTION MOTOR OF THE SO-CALLED FREE PISTON TYPE. THE MOTOR PISTON IS FIXEDLY ATTACHED TO THE PUMP PISTON. THE RETURN STOKE OF THE MOTOR PISTON IS EFFECTED BY THE APPLICATION OF A PRESSURE MEDIUM EITHER TO THE PUMP PISTON OR TO A SEPARATE RESETTING PISTON FIXEDLY ATTACHED TO THE MOTOR PISTON. THE WORKING FREQUENCY OF THE ASSEMBLY IS CONTROLLED BY MEANS OF A REGULATING VALVE RESTRICTING THE FLOW OF THE PRESSURE MEDIUM IN A FIRST PORTION OF THE RETURN STROKE.
Inventors
- 👤 Theodorus Gerhardus Potma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 01:36
CPC Classifications
F; F02; F02B; F02B71/00; F02B71/04; F02B71/045; F01; F01B; F01B11/00; F01B11/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |