Patents by Inventor Philippe Fenaux

Philippe Fenaux 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).

  • Ringing signal generator
    Patent number: 4584576
    Abstract: D.C.-fed ringing signal generator for a group of subscriber lines comprises a cascade arrangement of a digital signal generator controllable by a control signal to produce a signal corresponding either to the ringing signal or to a signal having zero value,a digital-to-analog converter,a capacitively-coupled class-A amplifier, anda direct-coupled class-B symmetrical power amplifier to produce the output signal of the ringing signal generator.
    Type: Grant
    Filed: October 26, 1983
    Date of Patent: April 22, 1986
    Assignee: Telecommunications Radioelectriques et Telephoniques T.R.T.
    Inventors: Alain Forestier, Philippe Fenaux