Patents by Inventor Chika Negishi

Chika Negishi 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).

  • Spiro compound and organic luminescence device using the same
    Publication number: 20060134425
    Abstract: Provided are a novel spiro compound, and an organic luminescence device using the spiro compound and having an optical output with an extremely high efficiency and a high luminance, and an extremely high durability. The Spiro compound is represented by the following general formula [I]: (wherein R1, R2, R3, and R4 represent a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted aralkyl group, a substituted or unsubstituted aryl group, a substituted or unsubstituted heterocyclic group, a substituted amino group, a cyano group, or a halogen atom, and R1, R2, R3, and R4 may be identical or different from each other; and Ar1 and Ar2 represent a substituted or unsubstituted condensed polycyclic aromatic group or a substituted or unsubstituted condensed polycyclic heterocyclic group, which may be identical or different from each other.
    Type: Application
    Filed: August 12, 2003
    Publication date: June 22, 2006
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Koichi Suzuki, Mizuho Hiraoka, Akihiro Senoo, Naoki Yamada, Chika Negishi, Akihito Saito
  • Organic light emitting device with reverse intersystem crossing light emitting molecules
    Patent number: 7034454
    Abstract: There is provided an organic light emitting device to break through the limit of 25% of internal quantum efficiency and 5% of external quantum efficiency while using singlet luminescence.
    Type: Grant
    Filed: December 12, 2003
    Date of Patent: April 25, 2006
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tatsundo Kawai, Koichi Suzuki, Hiroshi Tanabe, Keiji Okinaka, Naoki Yamada, Chika Negishi, Akihito Saito, Maki Okajima
  • Organic light-emitting device
    Publication number: 20060068221
    Abstract: To provide an organic light-emitting device that exhibits the hue of light emission having extremely high purity and has a light output having high luminance and long life with a high degree of efficiency. The organic light-emitting device comprises at least a pair of electrodes consisting of an anode and a cathode and one or more organic compound-containing layers sandwiched between the pair of electrodes, wherein at least one of the above described organic compound-containing layers contains at least one compound selected from the group consisting of the compounds represented by the following general formula [1] and at least one compound selected from the group consisting of the compounds represented by the following general formula [2].
    Type: Application
    Filed: August 26, 2003
    Publication date: March 30, 2006
    Applicant: Canon Kabushiki Kaisha
    Inventors: Akihito Saitoh, Mizuho Hiraoka, Koichi Suzuki, Akihiro Senoo, Hiroshi Tanabe, Naoki Yamada, Chika Negishi
  • Monoamino compound and organic luminescence device using the same
    Publication number: 20050244670
    Abstract: A novel monoamino compound is provided. Using the monoamino compound, an organic luminescence device is provided, which exhibits a luminescence hue with extremely high purity, and having an optical output of a high luminance with a high efficiency and a long life time. The monoamino compound is represented by the following general formula [1].
    Type: Application
    Filed: August 25, 2003
    Publication date: November 3, 2005
    Applicant: Canon Kabushiki Kaisha
    Inventors: Akihito Saitoh, Mizuho Hiraoka, Akihiro Senoo, Hiroshi Tanabe, Naoki Yamada, Chika Negishi
  • Oligofluorenlylene compounds
    Publication number: 20050106414
    Abstract: The present invention provides an oligofluorenylene compound represented by the general formula below, which enables production of an organic light-emitting device that exhibits an extremely pure luminescent hue and has a light emission of high efficiency, high brightness, and long lifetime.
    Type: Application
    Filed: March 25, 2003
    Publication date: May 19, 2005
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Akihito Saitoh, Mizuho Hiraoka, Koichi Suzuki, Akihiro Senoo, Hiroshi Tanabe, Naoki Yamada, Chika Negishi, Maki Okajima
  • Fluorene compound and organic lumnescent device using the same
    Publication number: 20040253389
    Abstract: A fluorene compound represented by the following general formula [I]: 1
    Type: Application
    Filed: April 6, 2004
    Publication date: December 16, 2004
    Inventors: Koichi Suzuki, Mizuho Hiraoka, Akihiro Senoo, Naoki Yamada, Chika Negishi, Akihito Saitoh, Daisaku Tanaka, Ryoji Yashiro
  • Organic light emitting device
    Publication number: 20040150327
    Abstract: There is provided an organic light emitting device to break through the limit of 25% of internal quantum efficiency and 5% of external quantum efficiency while using singlet luminescence.
    Type: Application
    Filed: December 12, 2003
    Publication date: August 5, 2004
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Tatsundo Kawai, Koichi Suzuki, Hiroshi Tanabe, Keiji Okinaka, Naoki Yamada, Chika Negishi, Akihito Saito, Maki Okajima