Telephone call screening apparatus

Details Telephone call screening apparatus Telephone call screening apparatus

1988-06-03

1989-07-18

Dwyer, James L.

Telephonic communications

Call or terminal access alarm or control

At substation

379373, H04M 166

Patent

active

048500135

ABSTRACT:
An apparatus to be connected in combination with a conventional telephone receiver and its circuit which prevents the telephone receiver from being activated (ringing) until a preselected code is supplied into the telephone circuit by the calling party.

REFERENCES:
patent: 4266098 (1981-05-01), Novak
patent: 4446334 (1984-05-01), Groff

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