Patent US3128457A successfully refreshed from Google Patents.
US3128457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Series operated relay alarm system
Assignee: Individual
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Filing: 1961-04-12
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Granted: 1964-04-07
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Expires: 1981-04-12
Abstract
No abstract record available.
Inventors
- 👤 George T Culbertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:43
CPC Classifications
G; G08; G08B; G08B23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
AN INDICATOR SYSTEM OF THE TYPE DESCRIBED COMPRISING: AT LEAST ONE REMOTE STATION HAVING A FAULT SWITCH RESPONSIVE TO A PREDETERMINED CONDITION, A REMOTE INDICATOR DEVICE FOR EACH SAID FAULT SWITCH ENERGIZED IN RESPONSE TO SAID PREDETERMINED CONDITION, AND A FIRST RELAY HAVING A FIRST RELAY COIL, A MASTER STATION HAVING A SOURCE OF SUPPLY VOLTAGE COMMON TO SAID MASTER STATION AND SAID AT LEAST ONE REMOTE STATION, A SINGLE MASTER INDICATOR DEVICE ENERGIZED IN RESPONSE TO SAID PREDETERMINED CONDITION, AND A SECOND RELAY HAVING A SECOND RELAY COIL INCLUDED IN A SERIES CIRCUIT WITH SAID FIRST RELAY COIL ACROSS SAID SOURCE OF SUPPLY VOLTAGE WHEN SAID FAULT SWITCH OPERATES, SAID SECOND RELAY COIL HAVING A GREATER IMPEDANCE THAN SAID FIRST RELAY COIL WHEREBY SAID SECOND RELAY IS OPERATED TO ENERGIZE SAID MASTER INDICATOR DEVICE WHILE SAID FIRST RELAY REMAINS IN A DE-ACTIVATED STATE.
Claim 2
Dependent Claim
144 words
AN INDICATOR SYSTEM OF THE TYPE DESCRIBED COMPRISING: AT LEAST ONE REMOTE STATION HAVING A FAULT SWITCH RESPONSIVE TO A PREDETERMINED CONDITION, A REMOTE INDICATOR DEVICE FOR EACH SAID FAULT SWITCH ENERGIZED IN RESPONSE TO SAID PREDETERMINED CONDITION, AND A FIRST RELAY HAVING A FIRST RELAY COIL, A MASTER STATION HAVING A SOURCE OF SUPPLY VOLTAGE COMMON TO SAID MASTER STATION AND SAID AT LEAST ONE REMOTE STATION, A SINGLE MASTER INDICATOR DEVICE ENERGIZED IN RESPONSE TO SAID PREDETERMINED CONDITION, AND A SECOND RELAY HAVING A SECOND RELAY COIL INCLUDED IN A SERIES CIRCUIT WITH SAID FIRST RELAY COIL ACROSS SAID SOURCE OF SUPPLY VOLTAGE WHEN SAID FAULT SWITCH OPERATES, SAID SECOND RELAY COIL HAVING A GREATER IMPEDANCE THAN SAID FIRST RELAY COIL WHEREBY SAID SECOND RELAY IS OPERATED TO ENERGIZE SAID MASTER INDICATOR DEVICE WHILE SAID FIRST RELAY REMAINS IN A DE-ACTIVATED STATE.
References Cited (Backward Citations)
US2712129A
Cited
FR749941A
Cited
US2839741A
Cited
US2840804A
Cited
US2947980A
Cited
US2883651A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-07 | 1967-10-07 | 1968-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-07 | 1971-10-07 | 1972-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-07 | 1975-10-07 | 1976-04-07 | $7700.00 | Window Closed / Lapsed |