Telephone privacy device

Details Telephone privacy device Telephone privacy device

1992-02-25

1993-07-27

Schreyer, Stafford

Telephonic communications

Call or terminal access alarm or control

Lockout or double use signalling

379199, 379442, 379195, H04M 172

Patent

active

052316580

ABSTRACT:
A telephone privacy protector for connection to a common exchange line and each one of at least two telephone operated devices sharing a line includes a voice connecting circuit for connection between a respective telephone line operated device and the line. There is a control deice connected to the circuit having an on and off state wherein the control device in the on state permits the voice connecting circuit to operate. There are means for turing the control device on when the respective telephone line operated device goes off hook provided that no other telephone line operated device sharing the line is off hook. There are means for providing a residual charge to the control device in order to reactivate same after the respective telephone line operated device is placed momentarily on hook and then returned to an off hook state while any other telephone line operated device connected to the line is off hook.

REFERENCES:
patent: 4805210 (1989-02-01), Griffith
patent: 4941166 (1990-07-01), Waldman et al.

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