Patents by Inventor Hiroaki Imajima

Hiroaki Imajima 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).

  • Method for producing biphenyltetracarboxylic acid tetraester
    Patent number: 8541615
    Abstract: Disclosed is a method for producing a biphenyltetracarboxylic acid ester by oxidative coupling a phthalic acid ester by using a catalyst comprising at least a palladium salt, a copper salt and a ?-dicarbonyl compound in the presence of a molecular oxygen, wherein the ?-dicarbonyl compound is supplied into a reaction mixture liquid intermittently at an interval of less than 30 minutes, or continuously. This method allows, in particular, the selective and economical production of an asymmetric biphenyltetracarboxylic acid tetraester such as 2,3,3?,4?-biphenyltetracarboxylic acid tetraester.
    Type: Grant
    Filed: August 6, 2009
    Date of Patent: September 24, 2013
    Assignee: Ube Industries, Ltd.
    Inventors: Masayuki Nishio, Hiroaki Imajima, Takato Nakamura, Yoshihiro Yamauchi
  • METHOD FOR PRODUCING BIPHENYLTETRACARBOXYLIC ACID TETRAESTER
    Publication number: 20110137069
    Abstract: Disclosed is a method for producing a biphenyltetracarboxylic acid ester by oxidative coupling a phthalic acid ester by using a catalyst comprising at least a palladium salt, a copper salt and a ?-dicarbonyl compound in the presence of a molecular oxygen, wherein the ?-dicarbonyl compound is supplied into a reaction mixture liquid intermittently at an interval of less than 30 minutes, or continuously. This method allows, in particular, the selective and economical production of an asymmetric biphenyltetracarboxylic acid tetraester such as 2,3,3?,4?-biphenyltetracarboxylic acid tetraester.
    Type: Application
    Filed: August 6, 2009
    Publication date: June 9, 2011
    Applicant: UBE INDUSTRIES, LTD.
    Inventors: Masayuki Nishio, Hiroaki Imajima, Takato Nakamura, Yoshihiro Yamauchi