Title: Protective alarm system for window using reflected microwave energy

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.

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Inventors: Shepherd, Jr., Mark (Dallas, TX, US)

Application Number: 813155
Filing Date: 1977-07-05
Publication_date: 1978-05-30
Assignee: Texas Instruments Incorporated (Dallas, TX)
Primary Class(es): 340/545.3 250/222.1, 340/552
Other Classes:
US Patent Ref:

3544988	Dec, 1970	Astheimer	340/282.
3665443	May, 1972	Galvin	340/258.
3739376	Jun, 1973	Keledy	340/224.
3752978	Aug, 1973	Kah, Jr. et al.	340/276.

Other Refs:
Primary Examiner: Swann, III, Glen R.
Assistant Examiner:
Attorney: Comfort; James T., Graham; John G.