Telephone privacy apparatus

Details Telephone privacy apparatus Telephone privacy apparatus

1982-01-21

1984-07-10

Pitts, Harold I.

179 84A, H04M 100

Patent

active

044594356

ABSTRACT:
A privacy circuit for selective connection to a telephone line to provide for silencing of a preselected number of ringing signals before subsequent ringing signals are transmitted to a telephone to be heard by a user. The circuit derives power entirely from the ringing signal on the telephone line, counts the number of initial ringing signals and then actuates an electronic alternating-current switch when the preselected number of ring signals has been detected. A discharge circuit resets the device after ringing signals have ceased for a preselected time. The privacy circuit may also be used with its own annunciator rather than connected to a telephone.

REFERENCES:
patent: 3777069 (1973-12-01), Lee

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