US3553550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for deriving a measuring voltage induced by the rotor of an electric motor
Assignee: US Philips Corp
•
Filing: 1969-04-17
•
Granted: 1971-01-05
•
Expires: 1989-04-17
Abstract
Abstract A PERMANENT MAGNET SYNCHRONOUS MOTOR IS PROVIDED WITH ENERGIZING AND FEEDBACK OR MEAUSURING WINDINGS SITURATED ON THE STATOR CORE AND MAGNETICALLY COUPLED. A TRANSFORMER, HAVING A PRIMARY WINDING CONNECTED IN SERIES WITH THE ENERGIZING WINDING AND A SECONDARY WINDING CONNECTED IN SERIES WITH THE MEASURING WINDOWS PROVIDES COMPENSATION FOR LOAD DEPENDENT VOLTAGE VARIATIONS INDUCED IN THE MEASURING WINDING.
Inventors
- 👤 Hugo Schemmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:46
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/34; G01R31/343; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/46; H; H02; H02P; H02P21/00
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) | 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 |