Resistance sensing supervisory system
Abstract
Abstract A SUPERVISORY SYSTEM IS PROVIDED FOR MONITORING A PLURALITY OF REMOTE STATIONS FROM A CENTRAL STATION. A SUPERVISORY CIRCUIT LOCATED AT EACH OF THE REMOTE STATIONS IS CONNECTED WITH A CORRESPONDING MONITORING CIRCUIT LOCATED AT THE CENTRAL STATION THROUG A PAIR OF CONDUCTORS. THE SUPERVISORY CIRCUITS EACH INCLUDE A SWITCHING DEVICE OPERABLE BETWEEN AN OPENED POSITION AND A CLOSED POSITION. A CONTROL CIRCUIT LOCATED AT THE CENTRAL STATION AND CONNECTED TO EACH OF THE MONITORING CIRCUITS DETECTS CLOSED SWITCH, OPENING SWITCH, GROUND, SHORT CIRCUIT AND OPEN CIRCUIT CONDITIONS EXISTING IN EACH OF THE SUPERVISORY CIRCUITS LOCATED AT THE REMOTE STATIONS. IN ADDITION, THE CONTROL CIRCUIT DETECTS A FAILURE OF ANY ONE OF THE SYSTEM COMPONENTS.
Inventors
- 👤 Ronald W Cox
- 👤 Arthur L Anderson
Bibliographic Details
Claims Analysis
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| 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 |