Telephone annunciator with low battery indication

Details Telephone annunciator with low battery indication Telephone annunciator with low battery indication

1986-10-06

1988-02-23

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379375, 379376, H04M 100

Patent

active

047275723

ABSTRACT:
A system for producing alternate summoning signals for telephones is described. The system is interposed between a conventional telephone and the telephone line. When a ringing signal occurs, the conventional ringer is silenced and replaced by a musical selection, a chime, a light display or other signal. The system is battery powered. When the battery voltage drops, the summoning signal changes to a continuous tone indicating the need for battery replacement.

REFERENCES:
patent: 3688038 (1972-08-01), Hugyecz et al.
patent: 3772470 (1973-11-01), Cowpland et al.
patent: 4184053 (1980-01-01), Saneyoshi
patent: 4480153 (1984-10-01), Festa
patent: 4653087 (1987-03-01), Galich

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