US3286642A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic balancing device in screw pumps
Assignee: Flygts Pumpar AB
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Filing: 1965-01-07
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Granted: 1966-11-22
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Expires: 1985-01-07
Abstract
No abstract record available.
Inventors
- 👤 Lindberg Gustav Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:10
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/10; F04C2/107; F04C2/1071; F04C2/1073
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
213 words
A HYDRAULIC BALANCING DEVICE IN SCREW PUMPS OF THE KIND COMPRISING A CASING HAVING ONE INLET AND ONE OUTLET, A STATOR MADE OF AN ELASTIC MATERIAL FIXED WITHIN THE CASING BETWEEN SAID INLET AND SAID OUTLET, A ROTOR BEING MOUNTED FOR ROTATION AND IN A SIMULTANEOUS ECCENTRIC MOVEMENT WITHIN THE STATOR IN COOPERATION WITH THE STATOR THREAD IN SUCH A WAY AS TO FORM CLOSES CHAMBERS BETWEEN SAID ROTOR AND SAID STATOR, SAID CHAMBERS GRADUALLY AND CONTINUOUSLY MOVING AXIALLY FROM SAID INLET TO SAID OUTLET WHILE CONVEYING THE PUMPED MEDIUM UNDER GROWING PRESSURE, CHARACTERIZED IN THAT THE STATOR DIAMETER IS SLIGHTLY LESS THAN THE INNER DIAMETER OF SAID CASING SO THAT A SMALL GAP IS FORMED THEREBETWEEN SUBSTANTIALLY AROUND THE PERIPHERY OF SAID STATOR, SAID SMALL GAP BEING CONNECTED TO THE PRESSURE AND SUCTION SIDE OF SAID PUMP PERMITING A SMALL FLOW OF PUMPING MEDIUM TO PASS FROM THE PRESSURE SIDE OF THE SUCTION SIDE OF SAID PUMP, THE PRESSURE EXERTED AGAINST THE PERIPHERY OF SAID STATOR DECREASING FROM A MAXIMUM AT THE PRESSURE SIDE OF SAID STATOR TO A MINIMUM AT THE SUCTION SIDE OF SAID STATOR SO THAT THE PRESSURE DISTRIBUTED ALONG SAID PERIPHERY OF SAID SATATOR WILL COINCIDE AT ANY POINT WITH THE PRESSURE PREVAILING RADIALLY WITHIN THE PUMPING CHAMBER.
Claim 2
Dependent Claim
213 words
A HYDRAULIC BALANCING DEVICE IN SCREW PUMPS OF THE KIND COMPRISING A CASING HAVING ONE INLET AND ONE OUTLET, A STATOR MADE OF AN ELASTIC MATERIAL FIXED WITHIN THE CASING BETWEEN SAID INLET AND SAID OUTLET, A ROTOR BEING MOUNTED FOR ROTATION AND IN A SIMULTANEOUS ECCENTRIC MOVEMENT WITHIN THE STATOR IN COOPERATION WITH THE STATOR THREAD IN SUCH A WAY AS TO FORM CLOSES CHAMBERS BETWEEN SAID ROTOR AND SAID STATOR, SAID CHAMBERS GRADUALLY AND CONTINUOUSLY MOVING AXIALLY FROM SAID INLET TO SAID OUTLET WHILE CONVEYING THE PUMPED MEDIUM UNDER GROWING PRESSURE, CHARACTERIZED IN THAT THE STATOR DIAMETER IS SLIGHTLY LESS THAN THE INNER DIAMETER OF SAID CASING SO THAT A SMALL GAP IS FORMED THEREBETWEEN SUBSTANTIALLY AROUND THE PERIPHERY OF SAID STATOR, SAID SMALL GAP BEING CONNECTED TO THE PRESSURE AND SUCTION SIDE OF SAID PUMP PERMITING A SMALL FLOW OF PUMPING MEDIUM TO PASS FROM THE PRESSURE SIDE OF THE SUCTION SIDE OF SAID PUMP, THE PRESSURE EXERTED AGAINST THE PERIPHERY OF SAID STATOR DECREASING FROM A MAXIMUM AT THE PRESSURE SIDE OF SAID STATOR TO A MINIMUM AT THE SUCTION SIDE OF SAID STATOR SO THAT THE PRESSURE DISTRIBUTED ALONG SAID PERIPHERY OF SAID SATATOR WILL COINCIDE AT ANY POINT WITH THE PRESSURE PREVAILING RADIALLY WITHIN THE PUMPING CHAMBER.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |