Patents by Inventor Jan Hendrik Duistermaat

Jan Hendrik Duistermaat 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 for manufacturing the picture display screen of a color television tube using a cylinder lens
    Patent number: 4111694
    Abstract: An exposure device for establishing the phosphor dots of a shadow mask color television tube. The apertures in the shadow mask are optically projected from a light source onto a photosensitive layer on the window of the tube. Arranged between the light source and the shadow mask is a cylinder lens with its axis in the direction of one of the main directions of the deflection coil system.
    Type: Grant
    Filed: June 28, 1974
    Date of Patent: September 5, 1978
    Assignee: U.S. Philips Corporation
    Inventors: Jan Hendrik Duistermaat, Johannes Cornelis Adrianus VAN Nes
  • 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