Patents by Inventor Kiyoshi Takumi

Kiyoshi Takumi 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 removing quaternary salt
    Patent number: 9469596
    Abstract: The purpose of the present invention is to provide a method for efficiently removing a quaternary salt from an organic solvent. The present invention relates to a method for removing a quaternary salt, the method including: contacting a solution of a quaternary salt in an organic solvent with an aqueous solution containing at least one member selected from the group consisting of (a1) compounds having one or more anionic functional groups and (a2) polymers having at least one member selected from the group consisting of carboxyl group and sulfonic acid group, thereby removing the quaternary salt from the organic solvent.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: October 18, 2016
    Assignee: ARAKAWA CHEMICAL INDUSTRIES, LTD.
    Inventors: Kiyoshi Takumi, Naoki Sasagawa, Yoichiro Ezaki
  • Method for producing epoxy compound
    Patent number: 9045446
    Abstract: To provide a method for producing an epoxy compound having fewer residual quaternary salt compound by removing the quaternary salt compound from an organic solution containing an epoxy compound and the quaternary salt compound.
    Type: Grant
    Filed: July 2, 2013
    Date of Patent: June 2, 2015
    Assignee: ARAKAWA CHEMICAL INDUSTRIES, LTD.
    Inventors: Naoki Sasagawa, Kiyoshi Takumi, Yoichiro Ezaki
  • METHOD FOR REMOVING QUATERNARY SALT
    Publication number: 20150031918
    Abstract: The purpose of the present invention is to provide a method for efficiently removing a quaternary salt from an organic solvent. The present invention relates to a method for removing a quaternary salt, the method including: contacting a solution of a quaternary salt in an organic solvent with an aqueous solution containing at least one member selected from the group consisting of (a1) compounds having one or more anionic functional groups and (a2) polymers having at least one member selected from the group consisting of carboxyl group and sulfonic acid group, thereby removing the quaternary salt from the organic solvent.
    Type: Application
    Filed: January 28, 2013
    Publication date: January 29, 2015
    Inventors: Kiyoshi Takumi, Naoki Sasagawa, Yoichiro Ezaki
  • Method for manufacturing an epoxy compound and method for epoxidizing a carbon—carbon double bond
    Patent number: 8742145
    Abstract: The present invention provides a method for producing an epoxy compound, comprising oxidizing a carbon-carbon double bond of an organic compound by hydrogen peroxide in the presence of a neutral inorganic salt and a mixed catalyst of a tungsten compound (a), at least one phosphorus compound selected from the group consisting of phosphoric acids, phosphonic acids, and salts thereof (b) and a surfactant (c), and an epoxidizing method comprising oxidizing a carbon-carbon double bond by hydrogen peroxide in the presence of the catalyst and the neutral inorganic salt.
    Type: Grant
    Filed: July 16, 2010
    Date of Patent: June 3, 2014
    Assignees: Arakawa Chemical Industries, Ltd., National Institute of Advanced Industrial Science and Technology
    Inventors: Kiyoshi Takumi, Naoki Sasagawa, Yoichiro Ezaki, Yoshihiro Kon, Yutaka Ono, Kazuhiko Sato
  • METHOD FOR PRODUCING EPOXY COMPOUND
    Publication number: 20140073806
    Abstract: To provide a method for producing an epoxy compound having fewer residual quaternary salt compound by removing the quaternary salt compound from an organic solution containing an epoxy compound and the quaternary salt compound.
    Type: Application
    Filed: July 2, 2013
    Publication date: March 13, 2014
    Applicant: Arakawa Chemical Industries, Ltd.
    Inventors: Naoki Sasagawa, Kiyoshi Takumi, Yoichiro Ezaki
  • METHOD FOR MANUFACTURING AN EPOXY COMPOUND AND METHOD FOR EPOXIDIZING A CARBON-CARBON DOUBLE BOND
    Publication number: 20120108830
    Abstract: The present invention provides a method for producing an epoxy compound, comprising oxidizing a carbon-carbon double bond of an organic compound by hydrogen peroxide in the presence of a neutral inorganic salt and a mixed catalyst of a tungsten compound (a), at least one phosphorus compound selected from the group consisting of phosphoric acids, phosphonic acids, and salts thereof (b) and a surfactant (c), and an epoxidizing method comprising oxidizing a carbon-carbon double bond by hydrogen peroxide in the presence of the catalyst and the neutral inorganic salt.
    Type: Application
    Filed: July 16, 2010
    Publication date: May 3, 2012
    Applicants: NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY, ARAKAWA CHEMICAL INDUSTRIES, LTD.
    Inventors: Kiyoshi Takumi, Naoki Sasagawa, Yoichiro Ezaki, Yoshihiro Kon, Yutaka Ono, Kazuhiko Sato