Telephone call indicator

Telephonic communications – Supervisory or control line signaling – Signal reception at substation

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Details

379396, 362 88, H04M 100

Patent

active

049513117

ABSTRACT:
A telephone includes a lamp pivotally mounted to the telephone housing. An inductive pick-up detects an incoming call on a telephone line and actuates a switching device to energize the lamp if the ambient light level adjacent the telephone is below a predetermined level as determined by a photosensor on the telephone housing. After disconnection of the call, a time delay circuit de-energizes the lamp after a predetermined time interval. The ambient light level at which the lamp will be illuminated and the time delay between call disconnection and lamp shut-off are programmable by a user. A manual override switch allows activation or deactivation of the lamp independently of detection of an incoming call or the ambient light level.

REFERENCES:
patent: 1702967 (1929-02-01), Hays
patent: 2813154 (1957-11-01), Rabinow
patent: 2960576 (1960-11-01), Kath
patent: 3683121 (1972-08-01), Aksu
patent: 3819873 (1974-06-01), Stockton et al.
patent: 3842216 (1974-10-01), Owen et al.
patent: 4587459 (1986-05-01), Blake
patent: 4701022 (1987-10-01), Jacob
patent: 4747133 (1988-05-01), Valenzona et al.
patent: 4757430 (1988-07-01), Dubak et al.
"Automatic Indoor Night Light", Radio Shack, 1986, Catalog, p. 146.

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