Patents by Inventor Akihiko Kouno

Akihiko Kouno 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).

  • Organic electroluminescent element and production method thereof
    Patent number: 6566807
    Abstract: An organic electroluminescent element comprising at least a light emitting layer containing an organic light emitting material placed between an anode and a cathode, wherein the element has, between the anode and the light emitting layer, at least a hole transporting layer containing a hole transporting material and an acceptor, and an electron injection restraining layer restraining the injection of electrons from the light emitting layer into the hole transporting layer, from the anode side, and/or, between the light emitting layer and the cathode, at least an electron transporting layer containing an electron transporting material and a donor, and a hole injection restraining layer restraining the injection of holes from the light emitting layer into the electron transporting layer, from the cathode side.
    Type: Grant
    Filed: December 27, 1999
    Date of Patent: May 20, 2003
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Yoshimasa Fujita, Takashi Ogura, Akihiko Kouno