Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1986-01-30
1988-06-14
Levy, Stewart J.
Communications: electrical
Condition responsive indicating system
Specific condition
G08B 1308
Patent
active
047514990
ABSTRACT:
A cordless remote controlled burglar proof device including a transmitter and a receiver, wherein the transmitter is controlled by a reed switch corresponding to a magnet. The reed switch and magnet are installed at door/window wing and frame respectively. When the reed switch senses the magnetic field of the magnet, then the circuit remains passive. As soon as the door/window is opened, the reed switch is no longer activated by the magnet, the transmitter is triggered to transmit an ultra high frequency electromagnetic signal to trigger lighting device or alarm upon receipt of the signal by the receiver.
REFERENCES:
patent: 3769556 (1973-10-01), Feldman
patent: 3986183 (1976-10-01), Fujiwara
patent: 4160972 (1979-07-01), LaMell et al.
patent: 4209777 (1980-06-01), Morrison
patent: 4232309 (1980-11-01), Dillitzer
patent: 4292629 (1981-09-01), Kerr et al.
patent: 4438430 (1984-03-01), Young et al.
Levy Stewart J.
Roskos Joseph W.
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