Circuit for an emergency lighting and fire detector system
US4199754A · kind A · utility
27Cited by
10References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 21, 1977 |
| Grant date | Apr 22, 1980 |
| Priority date | — |
| Expiry date | Nov 21, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/181
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit for a home safety unit having an emergency light system for providing light in the event of a power failure or when a fire is detected, and a fire detection system for providing an audible alarm indicating the existence of a fire. The circuit includes a battery which is constantly being charged and a low voltage responsive system for indicating a low voltage condition on the battery. A latching system causes the emergency light to be turned off when this low voltage condition is reached, and to remain off until the battery is recharged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.