Patents by Inventor Johannes Aloysius Van Leeuwen

Johannes Aloysius Van Leeuwen 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).

  • Plural gun cathode-ray tube with oval control electrodes
    Patent number: 3973161
    Abstract: In a color cathode-ray tube, the neck of the tube comprises an assembly of three electron guns lying in one plane. The size of the assembly is reduced by using oval control electrodes the longer axes of which are perpendicular to the plane through the electron guns.
    Type: Grant
    Filed: February 10, 1975
    Date of Patent: August 3, 1976
    Assignee: U.S. Philips Corporation
    Inventors: Johannes Aloysius VAN Leeuwen, Antonius Wilhelmus Franciscus VAN DER Heijden
  • Color cathode ray tube frame-color selection electrode support structure
    Patent number: 3936691
    Abstract: A cathode ray tube of the shadow mask type for displaying coloured pictures. Colour defects are reduced to a considerable extent by minimizing the influencing as a result of temperature influences of the shape of the shadow mask by the frame in which said shadow mask is mounted by means of supporting means which are resilient in the radial direction.
    Type: Grant
    Filed: November 1, 1974
    Date of Patent: February 3, 1976
    Assignee: U.S. Philips Corporation
    Inventors: Gijsbertus Bakker, Johannes Aloysius VAN Leeuwen
  • Picture display device and deflection coil both having self-aligning surfaces
    Patent number: 3934169
    Abstract: In a picture display tubes having deflection angles of 110.degree. and more the conical central part near the transition to the neck has a substantially flat variation perpendicular to the tube axis. As a result of this an accurate positioning of the deflection device on the display tube is seriously hampered. This problem is solved by centering members which are present on the conical central part and which cooperate in a self-centering manner with centering members forming part of the supporting cage of the deflection device. The position of the deflection device in the axial direction is accurately fixed by abutment members forming part of the supporting cage in co-operation with abutment surfaces forming part of the envelope of the tube.
    Type: Grant
    Filed: November 9, 1973
    Date of Patent: January 20, 1976
    Assignee: U.S. Philips Corporation
    Inventors: Adriaan Jacob Groothoff, Martin Clemens VAN DER Heijde, Johannes Aloysius Van Leeuwen, Constantius Johannes Waltherus Panis