Patents by Inventor Takeo Hirokawa

Takeo Hirokawa 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).

  • Metal complex and device using the metal complex
    Patent number: 9287514
    Abstract: Disclosed is an device having high light-emitting efficiency. A metal complex represented by the following formula (1). In the formula (1), n represents an integer of 1 to 3. LA and LB each independently represent the moiety of a group bonded to an iridium atom, except for coordinating atoms. When n is 3, a metal complex represented by the following formula (1-3): wherein Me represents a methyl group) is excluded.
    Type: Grant
    Filed: September 12, 2011
    Date of Patent: March 15, 2016
    Assignees: SUMITOMO CHEMICAL COMPANY, LIMITED, NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY
    Inventors: Noboru Kitamura, Eri Sakuda, Akitaka Ito, Takeo Hirokawa, Chizu Sekine, Yusuke Ishii
  • METAL COMPLEX AND DEVICE USING THE METAL COMPLEX
    Publication number: 20130168615
    Abstract: Disclosed is an device having high light-emitting efficiency. A metal complex represented by the following formula (1). In the formula (1), n represents an integer of 1 to 3. LA and LB each independently represent the moiety of a group bonded to an iridium atom, except for coordinating atoms. When n is 3, a metal complex represented by the following formula (1-3): wherein Me represents a methyl group) is excluded.
    Type: Application
    Filed: September 12, 2011
    Publication date: July 4, 2013
    Applicants: NATIONAL UNIVERSITY CORPORATION HOKKAIDO UNIVERSITY, SUMITOMO CHEMICAL COMPANY, LIMITED
    Inventors: Noboru Kitamura, Eri Sakuda, Akitaka Ito, Takeo Hirokawa, Chizu Sekine, Yusuke Ishii