Code-controlled ringer attachment for telephones including a-pea

Details Code-controlled ringer attachment for telephones including a-pea Code-controlled ringer attachment for telephones including a-pea

1975-09-04

1977-01-04

Mullins, James B.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

179 1A, 330127, 330129, H03G 330

Patent

active

040017087

ABSTRACT:
A system for selectively deactivating a telephone bell on a telephone instrument whereby when a telephone number is called, an auxiliary system automatically cuts in to prevent ringing of the bell until a predetermined code is dialed or touch-toned, at which time the telephone bell is actuated.

REFERENCES:
patent: 2999169 (1961-09-01), Feiner
patent: 3496383 (1970-02-01), Tomsa
patent: 3747005 (1973-07-01), Freimark et al.

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