Patents by Inventor Michel Ciboulet

Michel Ciboulet has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Telephone set ringing current injection device
    Patent number: 4306118
    Abstract: A telephone set line circuit ringing current injection device having a hybrid circuit in which each feed wire is connected in series with a resistor, and a stage consisting of a diode connected in parallel with the collector-to-emitter circuit of a transistor. The cathode of one diode is connected to the collector of the transistor on the side of one of the feed wires, the anode of the other diode and the emitter of the other transistor are connected to the other wire.
    Type: Grant
    Filed: September 14, 1979
    Date of Patent: December 15, 1981
    Assignee: Le Materiel Telephonique Thomson-CSF
    Inventors: Michel Ciboulet, Jean L. Belly, Antoine Malo-Huerto