Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1973-12-18
1976-02-17
Mayer, Albert J.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
325 53, 325 55, 325 64, 3402132, 340224, 340226, 340408, 343176, 343177, 343200, H04B 714, H04B 140
Patent
active
039394174
ABSTRACT:
A control console including a transceiver, a plurality of terminal stations positioned at spaced apart locations remote from the console and each including a transceiver connected to the console by RF or a wire line, and a plurality of call boxes positioned at spaced apart locations adjacent to each terminal station and including a transceiver in communication with the terminal station. When the hand set of a call box is lifted from the cradle a tone is transmitted through the adjacent terminal station to the console which then keys on all terminal station transmitters to indicate a busy line at other call boxes and to provide a ringing signal at the call box being used. Subsequent to transmission of the tone, a signal indicative of the address of the box and the condition of predetermined portions of the box is automatically transmitted to the console. When the console operator answers, full duplex communication is provided between the call box and the console.
REFERENCES:
patent: 2803744 (1957-08-01), Berger et al.
patent: 3154642 (1964-10-01), Hall et al.
patent: 3376509 (1968-04-01), Willcox et al.
patent: 3384714 (1968-05-01), Weld et al.
patent: 3492426 (1970-01-01), Foreman et al.
patent: 3581019 (1971-05-01), Ryan
patent: 3586978 (1971-06-01), Van Gorder
patent: 3632890 (1972-01-01), Hugenholtz
patent: 3800089 (1974-03-01), Reddick
Cannalte Gary A.
Crouse Richard J.
Koenig Richard D.
Rollins Thomas J.
Walker Donald L.
Bookbinder Marc E.
Gillman James W.
Mayer Albert J.
Motorola Inc.
Parsons Eugene A.
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