Patents by Inventor Maki Okajima

Maki Okajima 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 device
    Patent number: 7820478
    Abstract: To provide a light-emitting device which can emit light with high luminance and high efficiency, and is excellent in durability. The light-emitting device includes an organic compound layer containing a phenanthroline compound represented by the general formula [I] and a carbonate.
    Type: Grant
    Filed: October 19, 2009
    Date of Patent: October 26, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshinori Hasegawa, Koichi Suzuki, Maki Okajima, Toshihide Kimura
  • Light-emitting device
    Patent number: 7750340
    Abstract: To provide a light-emitting device which can emit light with high luminance and high efficiency, and is excellent in durability. The light-emitting device includes an organic compound layer containing a phenanthroline compound represented by the general formula [I] and a carbonate.
    Type: Grant
    Filed: September 28, 2005
    Date of Patent: July 6, 2010
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshinori Hasegawa, Koichi Suzuki, Maki Okajima, Toshihide Kimura
  • LIGHT-EMITTING DEVICE
    Publication number: 20100041171
    Abstract: To provide a light-emitting device which can emit light with high luminance and high efficiency, and is excellent in durability. The light-emitting device includes an organic compound layer containing a phenanthroline compound represented by the general formula [I] and a carbonate.
    Type: Application
    Filed: October 19, 2009
    Publication date: February 18, 2010
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Toshinori Hasegawa, Koichi Suzuki, Maki Okajima, Toshihide Kimura
  • PHENANTHROLINE COMPOUND AND ORGANIC LIGHT EMITTING DEVICE USING SAME
    Publication number: 20090218940
    Abstract: A novel phenanthroline compound is provided which is represented by the general formula [I]: (wherein R1, R2, R3, R4, R5 and R6 are the same or different and each is selected from a hydrogen atom, an unsubstituted or substituted alkyl group, an unsubstituted or substituted aralkyl group, an unsubstituted or substituted aryl group, an unsubstituted or substituted heterocyclic group, and a halogen atom; and Ar1 and Ar2 are the same or different and each is selected from an unsubstituted or substituted fluorenyl group, an unsubstituted or substituted fluoranthenyl group, an unsubstituted or substituted perylenyl group, and an unsubstituted or substituted carbazolyl group). An organic light emitting device using the phenanthroline compound is also provided that has a light output with a high efficiency and a high luminance and has a high long-term durability.
    Type: Application
    Filed: May 6, 2009
    Publication date: September 3, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Maki Okajima, Tatsundo Kawai, Takao Takiguchi, Koichi Suzuki, Akihiro Senoo, Toshinori Hasegawa, Keiji Okinaka
  • Phenanthroline compound and organic light emitting device using same
    Patent number: 7550594
    Abstract: A novel phenanthroline compound is provided which is represented by the general formula [I]: (wherein R1, R2, R3, R4, R5 and R6 are the same or different and each is selected from a hydrogen atom, an unsubstituted or substituted alkyl group, an unsubstituted or substituted aralkyl group, an unsubstituted or substituted aryl group, an unsubstituted or substituted heterocyclic group, and a halogen atom; and Ar1 and Ar2 are the same or different and each is selected from an unsubstituted or substituted fluorenyl group, an unsubstituted or substituted fluoranthenyl group, an unsubstituted or substituted perylenyl group, and an unsubstituted or substituted carbazolyl group). An organic light emitting device using the phenanthroline compound is also provided that has a light output with a high efficiency and a high luminance and has a high long-term durability.
    Type: Grant
    Filed: September 9, 2003
    Date of Patent: June 23, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Maki Okajima, Tatsundo Kawai, Takao Takiguchi, Koichi Suzuki, Akihiro Senoo, Toshinori Hasegawa, Keiji Okinaka
  • Condensed polycyclic compound and organic light-emitting device using the same
    Patent number: 7338721
    Abstract: A new condensed polycyclic compound represented by general formula [I]: wherein R1 is hydrogen, halogen, cyano, a substituted amino or a group selected from the group consisting of alkyl, aralkyl, aryl, heterocyclic, each having no substituent or a substituent; and Ar1 to Ar5 are the same or different and are each independently a condensed polycyclic aromatic group or a condensed polycyclic heterocyclic group, each having no substituent or a substituent is used for an organic light-emitting device that is extremely efficient in a light output with high luminance and is extremely durable.
    Type: Grant
    Filed: August 26, 2003
    Date of Patent: March 4, 2008
    Assignee: Canon Kabushiki Kaisha
    Inventors: Koichi Suzuki, Tatsundo Kawai, Akihiro Senoo, Naoki Yamada, Akihito Saitoh, Maki Okajima
  • Oligofluorenlylene compounds
    Patent number: 7229702
    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: Grant
    Filed: March 25, 2003
    Date of Patent: June 12, 2007
    Assignee: Canon Kabushiki Kaisha
    Inventors: Akihito Saitoh, Mizuho Hiraoka, Koichi Suzuki, Akihiro Senoo, Hiroshi Tanabe, Naoki Yamada, Chika Negishi, Maki Okajima
  • Phenanthroline compound and organic light emitting device using same
    Publication number: 20060097227
    Abstract: A novel phenanthroline compound is provided which is represented by the general formula [I]: (wherein R1, R2, R3, R4, R5 and R6 are the same or different and each is selected from a hydrogen atom, an unsubstituted or substituted alkyl group, an unsubstituted or substituted aralkyl group, an unsubstituted or substituted aryl group, an unsubstituted or substituted heterocyclic group, and a halogen atom; and Ar1 and Ar2 are the same or different and each is selected from an unsubstituted or substituted fluorenyl group, an unsubstituted or substituted fluoranthenyl group, an unsubstituted or substituted perylenyl group, and an unsubstituted or substituted carbazolyl group). An organic light emitting device using the phenanthroline compound is also provided that has a light output with a high efficiency and a high luminance and has a high long-term durability.
    Type: Application
    Filed: September 9, 2003
    Publication date: May 11, 2006
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Maki Okajima, Tatsundo Kawai, Takao Takiguchi, Koichi Suzuki, Akihiro Senoo, Toshinori Haseqawa, Keiji Okinaka
  • 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
  • Light-emitting device
    Publication number: 20060017050
    Abstract: To provide a light-emitting device which can emit light with high luminance and high efficiency, and is excellent in durability. The light-emitting device includes an organic compound layer containing a phenanthroline compound represented by the general formula [I] and a carbonate.
    Type: Application
    Filed: September 28, 2005
    Publication date: January 26, 2006
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Toshinori Hasegawa, Koichi Suzuki, Maki Okajima, Toshihide Kimura
  • Condensed polycyclic compound and organic light-emitting device using the same
    Publication number: 20050236974
    Abstract: A new condensed polycyclic compound represented by general formula [I]: wherein R1 is hydrogen, halogen, cyano, a substituted amino or a group selected from the group consisting of alkyl, aralkyl, aryl, heterocyclic, each having no substituent or a substituent; and Ar1 to Ar5 are the same or different and are each independently a condensed polycyclic aromatic group or a condensed polycyclic heterocyclic group, each having no substituent or a substituent is used for an organic light-emitting device that is extremely efficient in a light output with high luminance and is extremely durable.
    Type: Application
    Filed: August 26, 2003
    Publication date: October 27, 2005
    Applicant: Canon Kabushiki Kaisha
    Inventors: Koichi Suzuki, Tatsundo Kawai, akihiro Senoo, Naoki Yamada, Akihito Saitoh, Maki Okajima
  • 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
  • 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