Patent · US Expired

Ringing signal generator for a subscriber telephone set

US4595797A · kind A · utility

1Cited by

4References

3Claims

0Family size

Assignee

Thomson-Csf Telephone · FR

Inventors

Bernard Gilles · Cergy, FR
Raphael Roux · Colombes, FR
Jose Paulet · Courbevoie, FR

Key dates

Filing date	Jul 19, 1984
Grant date	Jun 17, 1986
Priority date	—
Expiry date	Jul 19, 2004

Classification

Technology area (CPC H)Electricity
CPC primaryH04M19/04
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

A ringing signal generator for a subscriber telephone set comprising a switch switching the input signal, followed by a phase shifter and two symmetrical amplifiers having a very high output impedance at rest. The lines are driven through isolating capacitors.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.