US3309685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supervisory circuit
Assignee: STANDARD ELECTRIC TIME CO
•
Filing: 1964-06-16
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Granted: 1967-03-14
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Expires: 1984-06-16
Abstract
No abstract record available.
Inventors
- 👤 Manning David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:32
CPC Classifications
G; G08; G08B; G08B21/00; G08B21/18; G08B21/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
IN AN ALARM SYSTEM INCLUDING A PLURALITY OF SIGNALING DEVICES, A CONTROL CIRCUIT INCLUDING A SOURCE OF DIRECT CURRENT, A PAIR OF CONDUCTORS CONNECTING SAID SOURCE TO SAID DEVICES IN PARALLEL ARRAY, SWITCH MEANS, A RELAY CONNECTED IN SERIES WITH SAID CONDUCTORS, SAID SWITCH MEANS AND SAID SOURCE, SAID SWITCH MEANS BEING INTERPOSED BETWEEN SAID SOURCE AND SAID DUCTORS ADN OPERABLE TO REVERSE THE POLARITY OF THE CONNECTION THEREBETWEEN AND TO REVERSE THE FLOW OF CURRENT ION SAID CONDUCTORS FROM A FIRST TO A SECOND DIRECTION, A POLARITY SENSING DEVICE INTERPOSED IN SERIES WITH EACH SAID SIGNALING DEVICE TO PASS CURRENT TO EACH SAID DEVICE ONLY WHEN SAID CURRENT FLOWS IN SAID SECOND DIRECTION AND NORMALLY TO PREVENT THE FLOW OF CURRENT TO EACH SAID DEVICE WHEN SAID CURRENT FLOWS IN SAID FIRST DIRECTION, SAID RELAY BEING ENERGIZED ONLY WHEN SAID CURRENT FLOWS IN SAID FIRST DIRECTION AND DEENERGIZED WHEN SAID CURRENT FLOWS IN SAID SECOND DIRECTION, AND MEANS RESPONSIVE TO DEENERGIZATION OF SAID RELAY FOR ACTUATING AN ALARM.
Claim 2
Dependent Claim
169 words
IN AN ALARM SYSTEM INCLUDING A PLURALITY OF SIGNALING DEVICES, A CONTROL CIRCUIT INCLUDING A SOURCE OF DIRECT CURRENT, A PAIR OF CONDUCTORS CONNECTING SAID SOURCE TO SAID DEVICES IN PARALLEL ARRAY, SWITCH MEANS, A RELAY CONNECTED IN SERIES WITH SAID CONDUCTORS, SAID SWITCH MEANS AND SAID SOURCE, SAID SWITCH MEANS BEING INTERPOSED BETWEEN SAID SOURCE AND SAID DUCTORS ADN OPERABLE TO REVERSE THE POLARITY OF THE CONNECTION THEREBETWEEN AND TO REVERSE THE FLOW OF CURRENT ION SAID CONDUCTORS FROM A FIRST TO A SECOND DIRECTION, A POLARITY SENSING DEVICE INTERPOSED IN SERIES WITH EACH SAID SIGNALING DEVICE TO PASS CURRENT TO EACH SAID DEVICE ONLY WHEN SAID CURRENT FLOWS IN SAID SECOND DIRECTION AND NORMALLY TO PREVENT THE FLOW OF CURRENT TO EACH SAID DEVICE WHEN SAID CURRENT FLOWS IN SAID FIRST DIRECTION, SAID RELAY BEING ENERGIZED ONLY WHEN SAID CURRENT FLOWS IN SAID FIRST DIRECTION AND DEENERGIZED WHEN SAID CURRENT FLOWS IN SAID SECOND DIRECTION, AND MEANS RESPONSIVE TO DEENERGIZATION OF SAID RELAY FOR ACTUATING AN ALARM.
References Cited (Backward Citations)
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Cited
US2565323A
Cited
US2814795A
Cited
GB866168A
Cited
US3045224A
Cited
US3155953A
Cited
US3188526A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |