Patents by Inventor Johannes G. VAN Lent

Johannes G. VAN Lent 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 colour television display tube and tube manufactured according to this method
    Patent number: 4496641
    Abstract: A method of making a colour display screen for a television display tube is disclosed. On the window portion of the tube an electron-absorbing layer is provided which is scanned by means of an electron beam via the shadow mask. The charge image on the layer is then developed xerographically. The layer is preferably photoconductive so as to be able to remove the charge remaining after the development by means of a uniform exposure.
    Type: Grant
    Filed: January 18, 1983
    Date of Patent: January 29, 1985
    Assignee: U.S. Philips Corporation
    Inventors: Jacob Van Den Berg, Johannes G. Van Lent, Francis B. Strik
  • 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
  • Cathode ray tube shadow mask with slotted apertures
    Patent number: 4127791
    Abstract: A cathode ray tube for displaying colored pictures of the shadow mask type. The shadow mask has rows of elongate apertures separated by bridges. By causing the vertical pitch, that is the distance between the centers of two successive apertures in a row, to vary in a given manner, substantially no irregularities in the applied phosphor lines occur any longer during the manufacture of the display screen.
    Type: Grant
    Filed: November 22, 1976
    Date of Patent: November 28, 1978
    Assignee: U.S. Philips Corporation
    Inventor: Johannes G. VAN Lent