Automatic call transfer circuit for a plurality of telephones

Details Automatic call transfer circuit for a plurality of telephones Automatic call transfer circuit for a plurality of telephones

1975-02-20

1976-12-28

Robinson, Thomas A.

179 38, H04M 100

Patent

active

040003752

ABSTRACT:
An automatic call transfer circuit for a plurality of telephones which are connected in parallel respectively between a pair of telephone lines, relay coils each one of which is connected with a different one of the telephones respectively and condensers each one of which is connected in parallel with a different one of the relay coils respectively. Energizing of each one of the relay coils makes it possible to use only the telephone which is connected to the energized relay coil. The circuit further comprises a current holding circuit which has at least one Zener diode for holding a current between the telephone lines at a moment of call transfer between the telephones in a telephone conversation where the current is flowing in a prescribed single direction.

REFERENCES:
patent: 3514544 (1970-05-01), Chambers, Jr.
patent: 3530253 (1970-09-01), Bierman
patent: 3651274 (1972-03-01), Angner et al.
patent: 3725595 (1973-04-01), Mechanic-Esfahani

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