Patents by Inventor Satoru Obara

Satoru Obara 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).

  • Dendrimer and electronic device element employing the same
    Patent number: 7687598
    Abstract: An object of the invention is to provide a novel dendrimer serving as an organic semiconductor material which is isotropic and which exhibits remarkably high carrier conductivity. Another object of the invention is to provide an electronic device employing the dendrimer. These objects are attained by a dendrimer having a branching structure in which repeating units each having a branch portion are repeatedly linked through the divergent method or the convergent method, each of said repeating units having a structure represented by formula (1), and containing a linear portion X formed of an optionally substituted divalent organic group and a branch portion Y formed of an optionally substituted trivalent organic group: characterized in that the linear portion X contains at least one thienylene moiety and is at least partially conjugated with the branch portion Y.
    Type: Grant
    Filed: July 14, 2003
    Date of Patent: March 30, 2010
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Motohiro Yamahara, Satoru Obara, Kentaro Tada
  • Dendritic polymer and electronic device element employing the polymer
    Patent number: 7585933
    Abstract: An object of the invention is to provide a novel dendritic polymer serving as an organic semiconductor material which is isotropic and which exhibits remarkably high carrier conductivity. Another object of the invention is to provide an electronic device employing the dendritic polymer. These objects are attained by a dendritic polymer having a branching structure including repeating units each having a branch portion, each of said repeating units having a structure represented by formula (1), and containing a linear portion X formed of an optionally substituted divalent organic group and a branch portion Y formed of an optionally substituted trivalent organic group: characterized in that the linear portion X contains at least one thienylene moiety and is at least partially conjugated with the branch portion Y, and in that the polymer reversibly assumes an insulative state and a metallic state, depending on the presence of an external factor.
    Type: Grant
    Filed: July 14, 2003
    Date of Patent: September 8, 2009
    Assignees: Sharp Kabushiki Kaisha, Toyo Gosei Co., Ltd.
    Inventors: Yamahara Motohiro, Satoru Obara, Kentaro Tada
  • Process for producing dendrimer, building block compound, and process for producing thiophene compound
    Patent number: 7531619
    Abstract: A method for producing a dendrimer having a structural repeating unit which is represented by formula (1) and which contains a linear portion including a thienylene moiety and a branch portion Y formed of an optionally substituted trivalent organic group.
    Type: Grant
    Filed: July 14, 2003
    Date of Patent: May 12, 2009
    Inventors: Satoru Obara, Kentaro Tada
  • Process for producing dendrimer, building block compound, and process for producing thiophene compound
    Publication number: 20060122364
    Abstract: A method for producing a dendrimer having a structural repeating unit which is represented by formula (1) and which contains a linear portion including a thienylene moiety and a branch portion Y formed of an optionally substituted trivalent organic group.
    Type: Application
    Filed: July 14, 2003
    Publication date: June 8, 2006
    Inventors: Satoru Obara, Kentaro Tada
  • Dendrimer and electronic device element employing the same
    Publication number: 20060102890
    Abstract: An object of the invention is to provide a novel dendrimer serving as an organic semiconductor material which is isotropic and which exhibits remarkably high carrier conductivity. Another object of the invention is to provide an electronic device employing the dendrimer. These objects are attained by a dendrimer having a branching structure in which repeating units each having a branch portion are repeatedly linked through the divergent method or the convergent method, each of said repeating units having a structure represented by formula (1), and containing a linear portion X formed of an optionally substituted divalent organic group and a branch portion Y formed of an optionally substituted trivalent organic group: characterized in that the linear portion X contains at least one thienylene moiety and is at least partially conjugated with the branch portion Y.
    Type: Application
    Filed: July 14, 2003
    Publication date: May 18, 2006
    Inventors: Motohiro Yamahara, Satoru Obara, Kentaro Tada
  • Dendritic polymer and electronic device element employing the polymer
    Publication number: 20060009614
    Abstract: An object of the invention is to provide a novel dendritic polymer serving as an organic semiconductor material which is isotropic and which exhibits remarkably high carrier conductivity. Another object of the invention is to provide an electronic device employing the dendritic polymer. These objects are attained by a dendritic polymer having a branching structure including repeating units each having a branch portion, each of said repeating units having a structure represented by formula (1), and containing a linear portion X formed of an optionally substituted divalent organic group and a branch portion Y formed of an optionally substituted trivalent organic group: characterized in that the linear portion X contains at least one thienylene moiety and is at least partially conjugated with the branch portion Y, and in that the polymer reversibly assumes an insulative state and a metallic state, depending on the presence of an external factor.
    Type: Application
    Filed: July 14, 2003
    Publication date: January 12, 2006
    Inventors: Motohiro Yamahara, Satoru Obara, Kentaro Tada