Patents by Inventor Leonardus Albertus Antonius Valkestijn

Leonardus Albertus Antonius Valkestijn 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).

  • Circuit for generating a correction current for correcting for deflection errors on the display screen of a color television display tube
    Patent number: 4028585
    Abstract: A circuit in a color television receiver for generating a correction current of field frequency for a quadripolar winding which is positioned on the core of the deflection coil. The circuit is in series with the deflection coil and constitutes a bridge circuit with diodes and resistors. A resistor is included in one diagonal branch and the winding in the other.
    Type: Grant
    Filed: March 11, 1976
    Date of Patent: June 7, 1977
    Assignee: U.S. Philips Corporation
    Inventors: Adrianus Hubertus Kantelberg, Leonardus Albertus Antonius Valkestijn