Patents by Inventor Robert T. Bonelli

Robert T. Bonelli 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).

  • External magnetic field compensator for a CRT
    Patent number: 4380716
    Abstract: Light sensors with red filters are located at four corners of a CRT out of view of the operator. A red raster is generated in the corners of the CRT, the pattern of the raster corresponding to the area covered by the sensors. A pair of coils is located about the face of the CRT in a Helmholtz configuration and are driven by a current generator in response to the sensor output to maximize sensor output, thereby generating a compensating magnetic field which cancels external axial fields affecting the CRT.
    Type: Grant
    Filed: October 9, 1981
    Date of Patent: April 19, 1983
    Assignee: Hazeltine Corporation
    Inventors: Arthur L. Romeo, Robert T. Bonelli, Harvey E. Fishman