Receiver device for receiving ringing signals in an off-hook lin

Details Receiver device for receiving ringing signals in an off-hook lin Receiver device for receiving ringing signals in an off-hook lin

1992-01-14

1995-02-14

Dwyer, James L.

Telephonic communications

Substation or terminal circuitry

Hold circuit

379377, 379386, 379387, H04M 174

Patent

active

053902491

ABSTRACT:
A telephone communication enable state maintaining circuit is disclosed, and the circuit includes a communication circuit 10, a communication operating circuit 20 and an operation maintaining circuit 30. The communication circuit 10 includes contacts 3,4,5, and a condenser C.sub.1. The communication operating circuit 20 includes a resistor r.sub.1, a condenser C.sub.2, a transistor 6 and contacts R.sub.3 a, R.sub.3 b, R.sub.1 a, R.sub.1 b. The operation maintaining circuit 30 includes contacts R.sub.1 c, R.sub.3 c, a resistor r.sub.2, a condenser C.sub.3, and a transistor 7. According to the present invention, telephone calls from the outside can be received, even if the telephone receiver is placed in an abnormal manner.

REFERENCES:
patent: 4903291 (1990-02-01), Tsurufuji et al.
patent: 4922529 (1990-05-01), Kiel

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