Patents by Inventor Johannes M. J. Spruyt

Johannes M. J. Spruyt 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).

  • Color display tube with control grid positioning feature
    Patent number: 4337409
    Abstract: A color display tube includes in an evacuated envelope, an electron gun system for producing three electron beams directed onto a display window. For each electron beam the electron gun system is provided with a cathode which is secured in a cup-shaped control grid having an aperture. The control grids are secured to a cup-shaped anode by means of a plate of electrically insulating material. The electron gun system may be constructed with a focusing electrode which is common for the three electron beams and a common accelerating electrode. A sleeve-shaped electrode may be secured to the anode and the focusing electrode is secured thereto by means of a ring of electrically insulating material.
    Type: Grant
    Filed: April 28, 1980
    Date of Patent: June 29, 1982
    Assignee: U.S. Philips Corporation
    Inventors: Antonius W. F. van der Heijden, Jorg Brambring, Johannes M. J. Spruyt