US3561833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor
Assignee: Licentia Patent Verwaltungs GmbH
•
Filing: 1969-11-10
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Granted: 1971-02-09
•
Expires: 1989-11-10
Abstract
Abstract A LOW COST HYSTERESIS MOTOR HAVING A ROTOR WHOSE YOKE IS FORMED OF ONE OR MORE HOLLOW CYLINDERS OF HYSTERETIC MATERIAL, THE INTERIORS OF WHICH ARE FILLED WITH A NONMAGNETIC FILLER MATERIAL PROVIDED WITH AN AXIAL BORE TO RECEIVE THE ROTOR SHAFT. THE EXTERIOR OF THE CYLINDERS IS ENCLOSED BY A LAMINATION PACKET OF LAYERS OF ANNULAR SHEETS OF CONVENTIONAL DYNAMO SHEET IRON WHICH SUPPORTS A SQUIRREL CAGE. AT THE ENDS OF THE ROTOR, THE FILLER MATERIAL IS PREFERABLY FORMED TO PROVIDE PROTRUSIONS WHICH SERVES AS VENTILATION VANES.
Inventors
- 👤 Heinz Hellmann
- 👤 Klaus Frohmuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:16
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/02; H02K19/14; H02K19/04; H02K19/08
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |