Message alert system

Details Message alert system Message alert system

1983-09-12

1985-03-19

Rubinson, Gene Z.

179 84L, 179 81C, H04M 164

Patent

active

045061157

ABSTRACT:
A lamp is provided on a telephone handset to notify the user that a message is waiting. The lamp is energized by a 1 hertz square wave obtained by demodulating a high frequency carrier sent from a transmitter.

REFERENCES:
patent: 3934098 (1976-01-01), Merritt, Jr.
patent: 3937889 (1976-02-01), Bell et al.

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