Patents by Inventor Yasuko Okuda

Yasuko Okuda 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 device
    Patent number: 5821003
    Abstract: An organic electroluminescent device having the hole-transport layer in which the hole-transport material is dispersed in the resin binder having a glass transition temperature of not less than 170.degree. C.Since the above organic electroluminescent device has the hole-transport layer exhibiting sufficient durability and higher hole-transport property, it is excellent in luminous efficiency, luminance and stability.
    Type: Grant
    Filed: September 20, 1996
    Date of Patent: October 13, 1998
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Takashi Uemura, Hiroya Kimura, Nobuyuki Okuda, Yoshinobu Ueba, Yasuko Okuda, Hajime Osaka
  • Triazole derivatives and organic electroluminescent devices produced therefrom
    Patent number: 5792567
    Abstract: The triazole derivatives of this invention are expressed by the general formula (1).The organic electroluminescent device of this invention have a layer containing at least one triazole derivative of the general formulas (1) and (2).Such triazole derivatives are excellent in electron-transport efficiency, hole-blocking properties and heat resistance, and such organic electroluminescent devices are excellent in luminous efficiency, luminance and stability. ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.6, R.sup.7, R.sup.8, R.sup.9 and R.sup.10 have the same meanings as indicated in the specification.
    Type: Grant
    Filed: February 7, 1996
    Date of Patent: August 11, 1998
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Junji Kido, Takashi Uemura, Hiroya Kimura, Nobuyuki Okuda, Yoshinobu Ueba, Yasuko Okuda, Hajime Osaka