Patents by Inventor Tetsuo Tsutui

Tetsuo Tsutui 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).

  • Electroluminescence device
    Patent number: 5085947
    Abstract: An electroluminescence device containing a first organic compound having positive-hole-transporting and luminous properties, such as a triphenyl amine compound, a stilbene derivative or a pyrazoline derivative, and a second organic compound having electron-transporting property, such as an oxadiazole derivative, in its luminescence layer interposed between a pair of electrodes.
    Type: Grant
    Filed: December 29, 1989
    Date of Patent: February 4, 1992
    Assignee: Ricoh Company, Ltd.
    Inventors: Shogo Saito, Tetsuo Tsutui, Chihaya Adachi