Emergency communication system

Details Emergency communication system Emergency communication system

1973-12-28

1976-10-12

Griffin, Robert L.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

325 5, 325 53, 325 64, 340 24, 340 31R, 340 33, 340226, H04B 700

Patent

active

039861198

ABSTRACT:
An emergency communication system used by stranded motorists to summon help when travelling on toll roads or other limited access highways. The emergency communication system comprises a portable, self-powered, hand-held transceiver set which transmits coded distress signals and directional signals, when activated, and cycles until reception of an answer back signal. The signals or messages from the portable transceiver are transmitted at incrementally increasing power levels to a single or a plurality of roadside relay stations spaced strategically along a limited access highway or toll road. The relay stations retransmit the signals to a terminal station which has means to decode the signals and determine the location of the repeater station nearest to the stranded motorist. The terminal station also has means for displaying the location of the relay station with the information derived from the decoded signal, and means for generating an answer back signal which is transmitted via the roadside relay station to the portable handset.

REFERENCES:
patent: 2678998 (1954-05-01), Young, Jr.
patent: 2978676 (1961-04-01), Spencer
patent: 3441858 (1969-04-01), Graham
patent: 3694579 (1972-09-01), McMurray
patent: 3721955 (1973-03-01), Schiff et al.
patent: 3824469 (1974-07-01), Ristenblatt
patent: 3864674 (1975-02-01), Worsham et al.
patent: 3866206 (1975-02-01), De Giorgio et al.
patent: 3876980 (1975-04-01), Haemmig
patent: 3914692 (1975-10-01), Seaborn, Jr.
patent: 3939417 (1976-02-01), Cannalte et al.

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