Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1975-04-28
1977-04-19
Habecker, Thomas B.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
325 55, 325364, 325466, 340224, 340311, 340312, H01B 138
Patent
active
040191397
ABSTRACT:
A method and apparatus for providing vigilance alarm in or about a multiple station installation as may be used basically in an apartment complex or neighborhood but may be extended to include any number of station alerts wherein an undesired disturbance at one station will be made known with characteristic identification at all remaining stations in the system. The apparatus includes at each station a similar type of unit which consists of a radio transmitter and receiver, the transmitter of which can be energized to transmit an alarm signal indicative of that particular station to all receivers of remaining stations; and receivers of remaining stations thereafter energize frequency selective response circuitry in order to indicate and give audible alarm of disturbance at the transmitting station.
REFERENCES:
patent: 2535162 (1950-12-01), Rodgers
patent: 3131354 (1964-04-01), Battin
patent: 3517316 (1970-06-01), Anderson
patent: 3588858 (1971-06-01), Demuth
patent: 3739329 (1973-06-01), Lester
patent: 3772668 (1973-11-01), Smith
patent: 3818345 (1974-06-01), Miya
patent: 3864674 (1975-02-01), Worsham
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