Patent US3552884A successfully refreshed from Google Patents.
US3552884A
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US
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Fluid pumping station working on the compressed air principle with partial recovery and re-cycling of the air
Assignee: EPI SpA
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Filing: 1968-07-15
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Granted: 1971-01-05
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Expires: 1988-07-15
Abstract
Abstract A DEVICE FOR PUMPING FLUIDS BY MEANS OF COMPRESSED AIR WHICH IS COMPRESSED IN SUCCESSION INTO A PLURALITY OF CHAMBERS SUBMERGED IN THE FLUID TO BE PUMPED, COMPRISING AN AUXILIARY COMPRESSOR FOR TRANSFERRING SOME COMPRESSED AIR FROM THE CHAMBER FROM WHICH THE FLUID HAS BEEN EXPELLED TO ANOTHER CHAMBER WHICH IS STILL FILLED WITH FLUID.
Inventors
- 👤 Giovanni Faldi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:05
CPC Classifications
F; F04; F04F; F04F1/00; F04F1/06; F04F1/10; E; E02; E02F; E02F3/00; E02F3/04; E02F3/88; E02F3/90
Claims Analysis
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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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |