Patents by Inventor Hermann Felix Wittmann

Hermann Felix Wittmann 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).

  • Electroluminescent devices with voltage drive scheme
    Patent number: 5965901
    Abstract: A light-emissive polymer device comprising: an anode; a cathode; a conjugated light-emissive polymer layer located between the anode and the cathode; and a driver for applying a voltage drive scheme between the anode and the cathode of a pattern having a relatively high voltage portion which causes the polymer layer to emit light and a relatively low voltage portion during which substantially no light is emitted by the polymer layer.
    Type: Grant
    Filed: November 26, 1997
    Date of Patent: October 12, 1999
    Assignee: Cambridge Display Technology Ltd.
    Inventors: Stephen Karl Heeks, Hermann Felix Wittmann