Patent US3559196A successfully refreshed from Google Patents.
US3559196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire alarm with bistable characteristics
Assignee: Cerberus AG
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Filing: 1967-12-27
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Granted: 1971-01-26
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Expires: 1987-12-27
Abstract
Abstract A FIRE ALARM DEVICE EXHIBITING BISTABLE CHARACTERISTICS, THE DEVICE COMPRISING A DETECTOR ELEMENT WHICH PROVIDES AN ELECTRIC SIGNAL IN RESPONSE TO A PHENOMENON ACCOMPANYING COMBUSTION, AND AN AMPLIFYING DEVICE CONNECTED WITH SAID DETECTOR ELEMENT IN A FEEDBACK CIRCUIT IN A MANNER SUCH THAT THE APPEARANCE OF AN ELECTRIC SIGNAL PRODUCES A CHANGE IN THE CONDITION OF THE AMPLIFYING DEVICE WHICH, IN TURN, PRODUCES A CHANGE IN THE POTENTIAL APPLIED TO THE DETECTOR ELEMENT RESULTING IN THE MAINTENANCE OF THE CHANGE IN CONDITION OF THE AMPLIFYING DEVICE UNTIL SUCH TIME AS A RE-SETTING OPERATION IS PERFORMED ON THE CIRCUIT.
Inventors
- 👤 Andreas Scheidweiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:27
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/10; G08B17/11
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) | 1974-01-25 | 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 |