Telephone, intercom and remote control system

Details Telephone, intercom and remote control system Telephone, intercom and remote control system

1977-01-19

1978-07-11

Cooper, William C.

179 1H, 179 18AD, 179 99, H04M 358, H04M 902, H04M 1102

Patent

active

041003756

ABSTRACT:
This system employs the standard single line tone dialing telephone instrument, connected via (typically) existing 4 conductor 22 gauge wire. A telephone hookswitch sensing circuit provides a trigger to connect a tone decoder across the talk path for a period of time established by a time delay circuit. When the instrument is tone dialed, the output of the tone decoder is fed respectively to: a gate circuit which switches the telephone instrument from the local intercom battery to an outside telephone line; a HOLD feature circuit which places the outside call on HOLD; a remote control circuit which turns on and off devices remote from this system; or to individual bells of other instruments within the system.

REFERENCES:
patent: 2828364 (1958-03-01), Bliss
patent: 3267379 (1966-08-01), Bloxsom
patent: 3909551 (1975-09-01), Marshall
patent: 3985974 (1976-10-01), Jusinskas, Jr. et al.
patent: 4006316 (1977-02-01), Bolgiano
"Remote Control of Heating Systems in Weekend Cottages", Hans Lardner, TELE, (English Ed.), v. 23, No. 2, 1971, 31-33.

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