Title: Emergency communications system

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.

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Inventors: Cannalte, Gary A. (Hoffman Estates, IL, US)
Crouse, Richard J. (Palatine, IL, US)
Koenig, Richard D. (Elgin, IL, US)
Rollins, Thomas J. (Arlington Heights, IL, US)
Walker, Donald L. (Addison, IL, US)

Application Number: 425908
Filing Date: 1973-12-18
Publication_date: 1976-02-17
Assignee: Motorola, Inc. (Chicago, IL)
Primary Class(es): 455/9 340/505, 455/15, 455/88, 455/508
Other Classes:
US Patent Ref:

2803744	Aug, 1957	Berger et al.	343/177.
3154642	Oct, 1964	Hall et al.	179/17.
3376509	Apr, 1968	Willcox et al.	325/53.
3384714	May, 1968	Weld et al.	179/5.
3492426	Jan, 1970	Foreman et al.	179/5.
3581019	May, 1971	Ryan	179/41.
3586978	Jun, 1971	Van Gorder	325/64.
3632890	Jan, 1972	Hugenholtz	179/17.
3800089	Mar, 1974	Reddick	179/5.

Other Refs:
Primary Examiner: Mayer, Albert J.
Assistant Examiner: Bookbinder, Marc E.
Attorney: Gillman; James W., Parsons; Eugene A.