Patents by Inventor Yoshinobu Yonemoto

Yoshinobu Yonemoto 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: 5487953
    Abstract: An organic electroluminescent device comprises an organic emitting layer and a hole transport layer laminated with each other and arranged between a cathode and an anode, in characterized in that the hole transport layer made of the triphenylbenzene derivative. This hole transport layer has the high heart-resistant property and high conductivity to improve the durability and thus this device emits light at a high luminance and a high efficiency upon application of a low voltage.
    Type: Grant
    Filed: September 20, 1994
    Date of Patent: January 30, 1996
    Assignees: Pioneer Electronic Corporation, Bando Chemical Industries, Ltd.
    Inventors: Yasuhiro Shirota, Hiroshi Inada, Yoshinobu Yonemoto, Takeo Wakimoto, Kunio Imai