Patents by Inventor Theodorus C. Groot

Theodorus C. Groot 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).

  • Method of manufacturing a color television display tube
    Patent number: 4373237
    Abstract: In a method of manufacturing a color television display tube, marks for the positioning of the display window are provided on the funnel part of the tube. Upon providing the marks the funnel part is fixed in a centering device which locates in the funnel part a reference point to which the provision of the marks is referenced. The reference point is situated in or substantially in the deflection center of a deflection device provided afterwards on the funnel part.
    Type: Grant
    Filed: March 11, 1980
    Date of Patent: February 15, 1983
    Assignee: U.S. Philips Corporation
    Inventors: Gijsbertus Bakker, Theodorus C. Groot
  • Method and apparatus for providing reference points for mounting the magnetic deflection unit of a color display tube
    Patent number: 4160935
    Abstract: The position of the electron beam axis of the central gun of an in-line tube is determined by moving the tube relative to a dynamic, multipole magnetic field produced by an electro-magnet mounted about the tube neck until a dot is displayed on the display screen. The line passing through the center of the field and the dot on the display screen defines the position of the beam axis and reference points related to that line are then provided on the tube envelope which locate the deflection unit so that its axis coincides with the beam axis.
    Type: Grant
    Filed: September 7, 1977
    Date of Patent: July 10, 1979
    Assignee: U.S. Philips Corporation
    Inventors: Theodorus C. Groot, Pieter Huijer, Johannes G. VAN Lent