Patents by Inventor Michael A. C. Robson

Michael A. C. Robson 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 circuit
    Patent number: 4737989
    Abstract: The invention concerns an electronic ringing circuit for telephone systems. A capacitor is connected to the center tapping of a first coil inductively coupled to a transistor-controlled supply line. The other side of the capacitor is connected to the junction between two switches each switch being connected via an induction coil to one end of the first coil so that when the switches are switched in opposite senses load current is drawn in alternate directions from the capacitor.
    Type: Grant
    Filed: March 10, 1987
    Date of Patent: April 12, 1988
    Assignee: The General Electric Company, p.l.c.
    Inventors: Michael A. C. Robson, Peter A. Cross