US3559018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-loop control system
Assignee: General Electric Co
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Filing: 1968-09-06
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Granted: 1971-01-26
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Expires: 1988-09-06
Abstract
Abstract A MOTOR IS ACCURATELY CONTROLLED WITHOUT SYSTEM INSTABILITY BY PROVIDING A MOTOR CONTROL SYSTEM HAVING TWO CONTROL LOOPS, A MAIN ANALOG LOOP WHICH IS OPERATIVE THROUGHOUT THE ENTIRE RANGE OF OPERATION OF THE MOTOR, AND A SECOND VERNIER LOOP, OF THE DIGITAL TYPE, WHICH OPERATES OVER A LIMITED RANGE OF THE SYSTEM TO COMPENSATE FOR INACCURACIES AND DRIFT IN THE MAIN ANALOG LOOP.
Inventors
- 👤 Joseph A Fournier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:12
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/2855; G; G05; G05B; G05B2219/00; G05B2219/30; G05B2219/42; G05B2219/42084; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/902; Y10S388/907; Y10S388/908; Y10S388/912
Claims Analysis
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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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |