Patents by Inventor Roy G. F. A. Verbeek

Roy G. F. A. Verbeek 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).

  • Electrochromic element, a display device provided with same and a method of manufacturing an electrochromic layer
    Patent number: 6011642
    Abstract: The electrochromic element (20) comprises a substrate (28) and an electrochromic layer (25) having a thickness d on the basis of a metal oxide selected from the group formed by tungsten oxide, molybdenum oxide, niobium oxide, manganese oxide and zirconium oxide, or combinations thereof. The electrochromic layer (25) is characterized in that the oxygen content in the layer (25) varies across the thickness d of the layer (25). Preferably, the variation of the oxygen content in the layer (25) comprises at least two local maxima and a local minimum. Preferably, the electrochromic layer (25) is composed of a plurality of sub-layers (25', 25", 25'"), with the variation of the oxygen content in the layer (25) occurring predominantly at the location of transitions between two sub-layers. Preferably, the electrochromic layer (25) comprises the metal oxide tungsten oxide WO.sub.x. The electrochromic element may be provided on the display screen of a display device.
    Type: Grant
    Filed: April 13, 1998
    Date of Patent: January 4, 2000
    Assignee: U.S. Philips Corporation
    Inventors: Teunis J. Vink, Erik P. Boonekamp, Roy G. F. A. Verbeek