Patents by Inventor Stefan Speh

Stefan Speh 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).

  • Flat panel fluorescent screen display tube
    Patent number: 5256937
    Abstract: A flat CRT display tube has a faceplace (11) with a fluorescent pixel screen (33) on its interior face. An area cathode assembly has an orthogonal array of segment electrodes (27) with overlying heater wires (25) spaced above them. A control assembly (38) arrayed between the cathode assembly and the screen includes orthogonal arrays of row electrodes (20) and column electrodes (21) with an overlying anode (19). A frame (18) supports the cathode assembly and the control assembly, and is itself supported by the tube's envelope, preferably by its faceplate (11).
    Type: Grant
    Filed: January 30, 1992
    Date of Patent: October 26, 1993
    Assignee: Nokia (Deutschland) GmbH
    Inventors: Gotthold Bubeck, Stefan Speh, Kurt-Manfred Tischer