Patent US1166732A successfully refreshed from Google Patents.
Patent US3588598A successfully refreshed from Google Patents.
US3588598A
Expired / Lapsed
US
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Lighting-control systems
Assignee: EMI Group Ltd
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Filing: 1968-01-02
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Granted: 1971-06-28
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Expires: 1988-01-02
Abstract
Abstract A LIGHTING CONTROL SYSTEM HAS ELECTRONICALLY TRIGGERED SWITCHING DEVICES CONTROLLING THE CURRENT SUPPLY TO A LIGHTING LOAD AND A FEEDBACK CIRCUIT FOR MODIFYING THE CONTROL CHARACTERISTICS OF THE SWITCHING DEVICES IN DEPENDENCE ON THE MEAN VALUE IN ANY HALF CYCLE OF THE VOLTAGE BETWEEN THE LOAD TERMINALS.
Inventors
- 👤 Anthony L Isaacs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:13
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/257; H02M5/2573; G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/45; G05F1/455; H05; H05B; H05B39/00; H05B39/04; H05B39/08; H05B39/083
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) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |