US3705840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotation servo system with frequency and phase error correction
Assignee: Victor Company of Japan Ltd
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Filing: 1970-08-26
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Granted: 1972-12-12
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Expires: 1990-08-26
Abstract
Abstract A rotation servo system controls a rotation of a motor by a closed servo loop. The closed servo loop includes means for comparing the phase of a signal which is generated responsive to the rotation of the motor with the phase of a reference signal, and means for frequency discriminating. The frequency discriminating means receives an output error signal from the phase comparing means and the rotation signal, and produces an output error signal responsive to the difference between the rotation signal and a presetting frequency.
Inventors
- 👤 Tsuneo Kosugi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:42
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/18; H02P23/186; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/901; Y10S388/902; Y10S388/907; Y10S388/915
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |