Patents by Inventor Ryoko Iida

Ryoko Iida 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).

  • Light-emitting compound and organic electroluminescence device
    Patent number: 8808876
    Abstract: A light-emitting compound includes two or more carbazole skeletons each having two or more fluorine atoms at 2-, 4-, 5- and 7-positions, the carbazole skeleton represented by the formula (1): where two or more of R2, R4, R5 and R7 are F and a remainder is H.
    Type: Grant
    Filed: November 11, 2009
    Date of Patent: August 19, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Isao Takasu, Ryoko Iida, Yukitami Mizuno, Shintaro Enomoto, Shuichi Uchikoga
  • LIGHT-EMITTING COMPOUND AND ORGANIC ELECTROLUMINESCENCE DEVICE
    Publication number: 20100123389
    Abstract: A light-emitting compound includes two or more carbazole skeletons each having two or more fluorine atoms at 2-, 4-, 5- and 7-positions, the carbazole skeleton represented by the formula (1): where two or more of R2, R4, R5 and R7 are F and a remainder is H.
    Type: Application
    Filed: November 11, 2009
    Publication date: May 20, 2010
    Inventors: Isao Takasu, Ryoko Iida, Yukitami Mizuno, Shintaro Enomoto, Shuichi Uchikoga