Patents by Inventor Robert Zapp

Robert Zapp 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).

  • Band-stop filter for equipment with carrier-frequency utilization of low-voltage lines
    Patent number: 4369416
    Abstract: Band-stop filter for equipment with carrier-frequency utilization of low-voltage lines, including a current-compensated choke having a closed ferrite core, two center taps, and two coil halves each of which having windings being connected to one of the center taps and wound with the same sense on the closed ferrite core, and a capacitor connected between the center taps.
    Type: Grant
    Filed: December 22, 1980
    Date of Patent: January 18, 1983
    Assignee: Brown, Boveri & Cie AG
    Inventors: Robert Zapp, Ewald Wichmann