Wireless alarm system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 4, 1980
Grant Date -
N/A
app pub date -
Jun 21, 1979
filing date -
Jun 21, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A radio receiver equipped central control unit continuously monitors at least one battery-powered remote transmitter activated in response to predetermined alarm conditions, such as open doors and windows, fire, smoke, low transmitter battery voltage, and the like. In its activated condition, the transmitter is cycled to radiate a one-second duration radio frequency signal every 30 seconds, such cycling being established by transmitter timer circuitry series-inserted between the transmitter and its battery power source. The transmitted signal is received by the central control unit which, in response to the received signal, selects and activates one or more alarm indicators for a predetermined time period. Such selection and activation of particular alarm indicators and the duration of their activation are determined by switching and timing circuitry series-inserted between the central control unit's radio frequency receiver and the various alarm indicators.
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