Patents by Inventor Achim Böhler

Achim Böhler 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).

  • Process of minimizing the operating voltage of an organic light emitting diode
    Patent number: 6617184
    Abstract: The process of minimizing the operating voltage of an organic light emitting diode includes the steps of providing a transparent substrate and applying a transparent bottom electrode thereto. It furthermore includes the step of applying to the bottom electrode a semitransparent layer of a metal having a work function in the range from 4 to 7 eV and applying to the semitransparent layer at least one organic functional layer and a top electrode including magnesium and silver.
    Type: Grant
    Filed: June 1, 2001
    Date of Patent: September 9, 2003
    Assignee: Siemens Aktiengesellschaft
    Inventors: Achim Böhler, Stefan Wiese, Dirk Metzdorf, Wolfgang Kowalsky
  • Organic light emitting diode including an organic functional layer between electrodes
    Patent number: 6262441
    Abstract: An organic light emitting diode includes a transparent bottom electrode located on a substrate, a top electrode, at least one organic functional layer disposed between the bottom electrode and the top electrode and a semitransparent layer located on the bottom electrode. The semitransparent layer is formed of a metal having a work function of between 4 and 7 eV.
    Type: Grant
    Filed: June 18, 1999
    Date of Patent: July 17, 2001
    Assignee: Siemens Aktiengesellschaft
    Inventors: Achim Böhler, Stefan Wiese, Dirk Metzdorf, Wolfgang Kowalsky