Patents by Inventor Leo H. M. Krings

Leo H. M. Krings 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).

  • Display device comprising a display screen having an antistatic and light-absorbing coating
    Patent number: 6208389
    Abstract: The display screen 3 of a cathode ray tube 1 is provided with an antistatic, light-absorbing coating 8 which consists of ATO (Sb:SnO2) particles and polypyrrole particles. The coating may be provided with additional layers of silicon dioxide to obtain an antireflective and antiglare effect.
    Type: Grant
    Filed: October 19, 1994
    Date of Patent: March 27, 2001
    Assignee: U.S. Philips Corporation
    Inventors: Gerardus V. A. Aben, Leo H. M. Krings
  • Electro-optical switching device
    Patent number: 5970187
    Abstract: A description is given of an electro-optical switching device (1) comprising a transparent substrate (3), a switching layer (5) of yttrium hydride as a first electrode, a palladium layer (7), an electrolyte layer of, e.g. Ta.sub.2 O.sub.5 (9), a layer of WO.sub.3 hydride as the second electrode (11), and a transparent ITO-layer (13). Under the influence of a potential difference or direct current between the electrodes (5) and (11), the yttrium hydride is electrochemically converted from a low-hydrogen-content state to a high-hydrogen-content state, or vice versa. The conversion between both compositions is reversible, and is accompanied by a change in optical transmission. Apart from Y, other trivalent metals may be used, such as Gd and La.
    Type: Grant
    Filed: August 14, 1997
    Date of Patent: October 19, 1999
    Assignee: U.S. Philips Corporation
    Inventors: Petrus H. L. Notten, Erik P. Boonekamp, Leo H. M. Krings, Johan Van De Ven
  • Electrochromic element
    Patent number: 5847858
    Abstract: The electrochromic element comprises an electrochromic layer (22) whose transmission properties change when a voltage difference is applied across the element. Said electrochromic layer (22) comprises a first metal oxide of the group formed by WO.sub.3, MoO.sub.3, Nb.sub.2 O.sub.5, MnO.sub.2 and ZrO.sub.2 (and combinations thereof) and a second metal oxide containing V.sub.2 O.sub.5, TiO.sub.2 and/or ZnO. If the concentration of the second metal in the mixture ranges from 1 to 15 at. %, preferably from 3 to 10 at. %, the electrochromic layer (22) is transparent and colorless if no guest atoms are incorporated in the layer, and it is (color neutral) grey if a substantial concentration of guest atoms is incorporated in the layer.Electrochromic elements are provided, for example, on the outer surface of a display screen of a display device.
    Type: Grant
    Filed: December 11, 1996
    Date of Patent: December 8, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Leo H. M. Krings, Emmanuel W. J. L. Oomen
  • Cathode ray tube comprising a display screen having an electroconductive coating
    Patent number: 5742119
    Abstract: The display screen 3 of a cathode ray tube 1 is provided with an electroconductive coating 8 of poly-3,4-ethylene dioxythiophene. The layer 8 has a sheet resistance of 1 k.OMEGA./.quadrature. and a high transmission. The layer 8 provides an effective shield against electromagnetic radiation. The coating can be provided with additional layers of, for example, silicon dioxide to improve the mechanical properties.
    Type: Grant
    Filed: August 8, 1995
    Date of Patent: April 21, 1998
    Assignee: U.S. Philips Corporation
    Inventors: Gerardus V. A. Aben, Leo H. M. Krings