USRE27740E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oscillating free piston pump
Assignee: —
•
Filing: 1972-01-12
•
Granted: 1973-08-21
•
Expires: 1992-01-12
Abstract
Abstract A THERMAL POWERED PUMP FORMED OF A CYLINDER, CONTAINING A FREE, OSCILLATING PISTON, AND HAVING A HEATING CHAMBER FOR PROVIDING ABOVE THE PISTON, HEATED, EXPANDING GASES TO BE PUMPED FOR MOVING THE PISTON DOWNWARDLY TO COMPRESS THE GAS LOCATED BENEATH IT WHICH, IN TURN RAISES PISTON SO THAT THE PISTON OSCILLATES UP AND DOWN, AND WITH THE PUMP OUTLET LOCATED ABOVE THE PISTON FOR EXPELLING THE GAS. A SHUNT INTERCONNECTS THE CYLINDER PORTIONS ABOVE AND BELOW THE PISTON FOR CARRYING GAS TO THE PORTION BELOW THE PISTON FOR MAINTAINING THE CENTER OF OSCILLATION OF THE PISTON WITH RESPECT TO THE CYLINDER.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:30
CPC Classifications
F; F04; F04B; F04B31/00
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |