Fibre optic security system
US4292628A · kind A · utility
37Cited by
13References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 28, 1978 |
| Grant date | Sep 29, 1981 |
| Priority date | — |
| Expiry date | Aug 28, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B29/123
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
In a security alarm system, connections between a local sensor unit or units and a control unit are established by flexible optical light fibre guides, a normal condition of a sensor being indicated by the maintenance of a light signal or signals passing through an associated guide from the sensor unit to the control unit where there is monitoring of at least one parameter of the signal which is dependent on the integrity of the guide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.