Patents by Inventor Jan Gerritsen

Jan Gerritsen 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 display tube and color display tube manufactured according to said method
    Patent number: 4220897
    Abstract: A ring is provided to correct the convergence, color purity and frame errors of a color display tube which ring is magnetized as a multipole and which is secured in or around the tube neck and around the paths of the electron beams.The magnetization of such a ring can best be carried out by energizing a magnetization unit with a combination of direct currents thereby generating a multipole magnetic field and then effecting the magnetization by generating a decaying alternating magnetic field which preferably varies its direction continuously.
    Type: Grant
    Filed: May 19, 1978
    Date of Patent: September 2, 1980
    Assignee: U.S. Philips Corporation
    Inventors: Piet G. J. Barten, Jan Gerritsen, Kees Tendeloo
  • 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
  • Degaussing device for a color television display tube
    Patent number: 3965386
    Abstract: A degaussing device for a color television display tube having three electron guns arranged in one horizontal plane and vertically directed phosphor strips on the display screen, comprising degaussing coils which envelop a major part of the conical surface of the tube and are arranged such as to generate a vertically directed magnetic field, and a capacitor connected parallel to the degaussing coils, the impedance of the capacitor being high at the frequency of the degaussing current and low at the frequency of the line deflection current.
    Type: Grant
    Filed: September 3, 1974
    Date of Patent: June 22, 1976
    Assignee: U.S. Philips Corporation
    Inventors: Jan Hendrik Duistermaat, Jan Gerritsen, Constantius Johannes Waltherus Panis