Code-controlled ringer attachment for telephones

Details Code-controlled ringer attachment for telephones Code-controlled ringer attachment for telephones

1974-08-12

1976-02-03

Claffy, Kathleen H.

179 18DA, H04M 338

Patent

active

039366170

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 initiated by the calling station, at which time the telephone bell is actuated.

REFERENCES:
patent: 3226489 (1965-12-01), Grambsch
patent: 3514548 (1970-05-01), DeMeo
patent: 3654396 (1972-04-01), Biezeveld
patent: 3793487 (1974-02-01), Kilby

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