Telephonic communications – Private or single line system – Doorbell system
Patent
1995-02-22
1997-03-18
Kuntz, Curtis
Telephonic communications
Private or single line system
Doorbell system
379103, 379102, 348 14, H04M 900, H04M 1100, H04N 714
Patent
active
056129947
ABSTRACT:
An interphone system includes an outdoor interphone device and a plurality of indoor interphone devices each of which is connected to the outdoor interphone device via a common interphone line, a plurality of televisions electrically connected to a camera which monitors areas around a lobby door and sends an image taken therefrom to the televisions. The outdoor interphone device includes a keypad for outputting a specific signal representing one of the indoor interphone devices upon depression by a visitor. Each of the indoor interphone devices includes a telephone set and a switching device which electrically connects the telephone set to the outdoor interphone device when the specific signal from the outdoor interphone device is received by the indoor interphone device and electrically connects the telephone set to a corresponding telephone line from a telephone exchange when an external telephone call is detected by the indoor interphone device, and a device for setting the television into an audio/video input mode to show the visitor image when a receiver of the telephone set is picked up upon connection of the telephone set and the outdoor interphone device.
REFERENCES:
patent: 4075659 (1978-02-01), Desanti
patent: 4370675 (1983-01-01), Cohn
patent: 4937855 (1990-06-01), McNab et al.
patent: 4959713 (1990-09-01), Morotomi et al.
patent: 5032820 (1991-07-01), Tanikawa et al.
patent: 5142604 (1992-08-01), Lee
patent: 5428388 (1995-06-01), Von Bauer et al.
Kuntz Curtis
Loomis Paul
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