Patents by Inventor Ikuko Ihara

Ikuko Ihara 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).

  • Amine compound and electro-luminescence device comprising same
    Patent number: 5707747
    Abstract: The present invention provides novel amine compounds useful as electron-transporting materials to be incorporated in organic electro-luminescence devices. More particularly, the present invention provides an organic electro-luminescence device (organic EL device) which can find wide application in various display units, requires a low applied voltage and exhibits a high luminance and an excellent stability.
    Type: Grant
    Filed: October 25, 1996
    Date of Patent: January 13, 1998
    Assignees: Hodogaya Chemical Co., Ltd., Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiromitsu Tomiyama, Masahiko Oshino, Ikuko Ihara, Naoko Nakanishi, Mutsumi Suzuki, Masao Fukuyama, Mutsuaki Murakami, Taro Nambu
  • Tetraaryl benzidines
    Patent number: 5639914
    Abstract: The present invention provides novel amine compounds useful as electron-transporting materials to be incorporated in organic electro-luminescence devices. More particularly, the present invention provides an organic electro-luminescence device (organic EL device) which can find wide application in various display units, requires a low applied voltage and exhibits a high luminance and an excellent stability.
    Type: Grant
    Filed: November 1, 1994
    Date of Patent: June 17, 1997
    Assignees: Hodogaya Chemical Co., Ltd., Matsushita Electric Industrial Co., Ltd.
    Inventors: Hiromitsu Tomiyama, Masahiko Oshino, Ikuko Ihara, Naoko Nakanishi