Protective alarm system for window using reflected microwave ene

Details Protective alarm system for window using reflected microwave ene Protective alarm system for window using reflected microwave ene

1977-07-05

1978-05-30

Swann, III, Glen R.

Communications: electrical

Systems

Call station

250222R, 340224, 340258D, G08B 1308, G08B 1304

Patent

active

040926362

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.

REFERENCES:
patent: 3544988 (1970-12-01), Astheimer
patent: 3665443 (1972-05-01), Galvin
patent: 3739376 (1973-06-01), Keledy
patent: 3752978 (1973-08-01), Kahl, Jr. et al.

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