Citizens alarm system
US4040013A · kind A · utility
14Cited by
13References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 9, 1975 |
| Grant date | Aug 2, 1977 |
| Priority date | — |
| Expiry date | Jan 9, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B25/001
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A combined police and fire alarm system has provision for voice communication between street corner boxes and a central station via existing telegraphic cables. The boxes automatically transmit identification signals to the central station upon being activated. The central station can check out the boxes by causing them to transmit their identification signals and an audio test signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.