Patents by Inventor Johannes H. J. Roosen

Johannes H. J. Roosen 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).

  • Cathode ray tube having multilayer interference filter
    Patent number: 5068568
    Abstract: A cathode ray tube, such as a projection cathode ray tube, having a multilayer interference filter disposed between the cathodoluminescent screen and the interior side of the faceplate, the interference filter comprising alternate layers having high (H) and low (L) refractive indices, the high refractive index material being niobium pentoxide and the low refractive index material being either silicon oxide or magnesium fluoride. These filters are substantially free from the crazing which occurs in known filters when subjected to the normal thermal processing of cathode ray tubes.
    Type: Grant
    Filed: May 15, 1990
    Date of Patent: November 26, 1991
    Assignee: U.S. Philips Corporation
    Inventors: Henricus M. de Vrieze, Johannes H. J. Roosen, Leendert Vriens