Protective alarm system for window using reflected microwave energy
US4092636A · kind A · utility
16Cited by
4References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1977 |
| Grant date | May 30, 1978 |
| Priority date | — |
| Expiry date | Jul 5, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/2491
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A simplified protective system as for a home burglar alarm comprises a beam generator such as a solid state microwave module along with a detector and alarm or indicator. The beam generator and detector unit is positioned along a line-of-sight normal to a window or other object being monitored. A reflector such as a mirror on the window reflects the beam back to the detector. When the window is moved or broken, the beam does not reach the detector and the alarm is actuated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.