Control circuit for an electrical telephone accessory

Details Control circuit for an electrical telephone accessory Control circuit for an electrical telephone accessory

1990-12-18

1992-10-20

Dwyer, James L.

Telephonic communications

Supervisory or control line signaling

Signal reception at substation

379377, 379396, 379442, H04M 100

Patent

active

051577216

ABSTRACT:
A control circuit for an electrical telephone accessory detects if the telephone receiver is on the cradle, the telephone ringer is actuated, or if the telephone receiver is lifted from the cradle. The control circuit connects the electrical telephone accessory to a power supply source when the telephone ringer is actuated or when the telephone receiver is lifted from the cradle.

REFERENCES:
patent: 4426564 (1984-01-01), Steigerwald et al.
patent: 4747133 (1988-05-01), Valenzona et al.
patent: 4951311 (1990-08-01), Sterr
patent: 5087906 (1992-02-01), Eaton et al.

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