Communications: electrical – Condition responsive indicating system – With particular coupling link
Patent
1988-12-02
1991-05-28
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
With particular coupling link
340333, 340636, 340693, 307 107, G08B 108
Patent
active
050198033
ABSTRACT:
A detector unit for use in detecting unauthorized intrusion into homes, offices, factories and other buildings is described. The detector unit comprises a detector such as a passive infrared detector and a radio frequency transmitter that is connected to the detector and that transmits a detector signal when the detector is actuated, and battery means. Two batteries power the detector and the transmitter. A power control means is arranged so that when the power of the said first battery drops below a certain minimum the second battery is connected to the detector and the transmitter. A warning is given at the main control unit that the second battery is being used so that the user can now replace both batteries.
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J. B. Landrock et al., "Emergency Battery Charger", IBM Technical Disclosure Bulletin, vol. 26, No. 1, Jun. 1983, pp. 282, 283.
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