Patent US3669578A successfully refreshed from Google Patents.
US3669578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pumping apparatus
Assignee: Individual
•
Filing: 1970-09-21
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Granted: 1972-06-13
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Expires: 1990-09-21
Abstract
Abstract A PUMP FOR FLUIDS AND GASES IS DISCLOSED IN WHICH THE FLUID IS SQUEEZED THROUGH AN ANNULAR CAVITY BY A ROTATING PRESSURE PLATE ESSENTRICALLY DRIVEN BY A DRIVE SHAFT. THE ANNULAR CAVITY IS FORMED BY BONDING A RUBBER MEMBRANE OVER AN ANNULAR GROOVE. THE PRESSURE PLATE HAS AN ANNULAR TOROIDAL COMPRESSION MEMBER WHICH GYRATES ABOUT THE DRIVE SHAFT FORCING THE MEMBRANE INTO THE ANNULAR CAVITY. THE MEMBRANE IS PROTECTED FROM FRICTIONAL FORCES BY A SPECIAL CAVITY SHAPE AND DUAL SETS OF BEARINGS IN THE PRESSURE PLATE. VARIATIONS INCLUDE DRIVING A SECOND PUMP FROM THE OTHER SIDE OF THE PRESSURE PLATE.
Inventors
- 👤 Frank J Nameny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:23
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/12; F04B43/14
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) | 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 |