Patents by Inventor Michel F. M. S. Ferry

Michel F. M. S. Ferry 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).

  • DC Power supply circuit for line interface circuits
    Patent number: 4562525
    Abstract: A circuit for supplying direct current to a line (a, b) from a battery via two supply resistors (RA, RB). Part of the current supplied by the battery flows in a secondary path including a resistor (R4) and a transistor (16), and is maintained at a constant value. A symmetrical and differential resistance bridge connected between the supply resistors and the line detects the transverse alternating current flowing into the battery, and means (15) are provided to cause the transistor to generate a negative-feedback alternating current whose value is adjusted to cancel said transverse alternating current.
    Type: Grant
    Filed: July 9, 1984
    Date of Patent: December 31, 1985
    Assignee: International Business Machines Corporation
    Inventors: Michel F. M. S. Ferry, Jacques L. Trehin