Patents Assigned to Amper S.A.
  • Current detector circuit
    Patent number: 4310724
    Abstract: A current detector circuit, preferably for use in telephone equipment, to detect the on-hook and off-hook conditions of of such equipment, includes two equal transformers which have primary coils mounted in series and secondary coils mounted in series opposition, but in series with a circuit within which it is desired to detect the current. The primary coils constitute the load of the collector of an NPN transistor. Such collector is connected by means of a resistor to the base of a PNP transistor.
    Type: Grant
    Filed: November 27, 1979
    Date of Patent: January 12, 1982
    Assignee: Amper S.A.
    Inventor: Cesar R. Gonzalez
  • Push button telephone
    Patent number: D246650
    Type: Grant
    Filed: August 3, 1976
    Date of Patent: December 13, 1977
    Assignee: Amper S.A.
    Inventor: Antonio Peral-Hernandez