Patents by Inventor Willem Meijndert Van Alphen

Willem Meijndert Van Alphen 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).

  • Shadow mask each aperture of which is defined by a quadrupolar lens
    Patent number: 4059781
    Abstract: A post-focusing type color cathode ray tube comprising a quadrupole lens formed in each aperture of the color selection mask.
    Type: Grant
    Filed: March 22, 1977
    Date of Patent: November 22, 1977
    Assignee: U.S. Philips Corporation
    Inventors: Willem Meijndert VAN Alphen, Jan Verweel
  • Device for displaying color television images
    Patent number: 4027219
    Abstract: A color television display tube comprising at least eight correction coils, arranged in one plane about the tube neck, for controlling the static convergence and possibly other aspects such as color purity.
    Type: Grant
    Filed: November 5, 1975
    Date of Patent: May 31, 1977
    Assignee: U.S. Philips Corporation
    Inventors: Willem Meijndert Van Alphen, Piet Gerard Joseph Barten, Johannes Van Den Boogert, Joris Adelbert Maria Nieuwendijk, Jan Gerritsen, Adrianus Hubertus Kantelberg
  • Cathode-ray tube having electrostatic focusing and electrostatic deflection in one lens
    Patent number: 3952227
    Abstract: A cathode-ray tube having electrostatic focusing and electrostatic deflection lens which comprises three cylindrical electrode arranged along a common axis. The end electrodes are supplied by a high focusing voltage and the intermediate electrode is divided into at least three segments, each being supplied by a voltage which is a linear combination of a lower focusing voltage and of two deflection voltages.
    Type: Grant
    Filed: November 26, 1974
    Date of Patent: April 20, 1976
    Assignee: U.S. Philips Corporation
    Inventor: Willem Meijndert Van Alphen