US3669574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deep water pumping of fluids and semi-fluids
Assignee: Individual
•
Filing: 1970-03-18
•
Granted: 1972-06-13
•
Expires: 1990-03-18
Abstract
Abstract A ROTARY PERSISTALIC PUMP FOR PUMPING FLUIDS AND SEMIFLUIDS IN UNDERWATER LOCATIONS INCLUDES A SEMI-CIRCULAR PIECE OF COMPRESSIBLE TUBING DISPOSED AROUND THE INNER ARCUATE SURFACE OF A SUBSTANTIALLY WATER-TIGHT HOUSING WITH PUMP ACTION OBTAINED BY A PAIR OF POWER DRIVEN COMPRESSION WHEELS. A CHECK VALVE MOUNTED ON THE HOUSING AND COMMUNICATING WITH THE INTERIOR THEREOF IS USED TO MAINTAIN A PREDETERMINED PRESSURE DIFFERENTIAL BETWEEN THE INTERIOR AND EXTERIOR OF THE HOUSING.
Inventors
- 👤 John T Broadfoot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:49
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/12; F04B43/1253
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |