Patents by Inventor Jun TAKEOKA

Jun TAKEOKA 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 preparing anionic macromolecular compound exhibiting improved water solubility
    Patent number: 11555080
    Abstract: The present invention provides a method for removing a divalent metal cation from a macromolecular compound having an anionic functional group and containing the divalent metal cation, including (1) suspending a macromolecular compound having an anionic functional group and containing a divalent metal cation in a solution in which an electrolyte that releases an alkali metal ion is dissolved at a concentration at which the macromolecular compound is salted out, and (2) performing, in the obtained suspension, an ion exchange reaction to exchange the divalent metal cation contained in the macromolecular compound with the alkali metal ion.
    Type: Grant
    Filed: May 1, 2018
    Date of Patent: January 17, 2023
    Assignee: NISSAN CHEMICAL CORPORATION
    Inventors: Koichiro Saruhashi, Yoko Okuni, Keisuke Morodome, Jun Takeoka
  • METHOD FOR PREPARING ANIONIC MACROMOLECULAR COMPOUND EXHIBITING IMPROVED WATER SOLUBILITY
    Publication number: 20200055962
    Abstract: The present invention provides a method for removing a divalent metal cation from a macromolecular compound having an anionic functional group and containing the divalent metal cation, including (1) suspending a macromolecular compound having an anionic functional group and containing a divalent metal cation in a solution in which an electrolyte that releases an alkali metal ion is dissolved at a concentration at which the macromolecular compound is salted out, and (2) performing, in the obtained suspension, an ion exchange reaction to exchange the divalent metal cation contained in the macromolecular compound with the alkali metal ion.
    Type: Application
    Filed: May 1, 2018
    Publication date: February 20, 2020
    Applicant: NISSAN CHEMICAL CORPORATION
    Inventors: Koichiro SARUHASHI, Yoko OKUNI, Keisuke MORODOME, Jun TAKEOKA
  • METHOD FOR PRODUCING 2-PYRIDONE COMPOUND
    Publication number: 20170267659
    Abstract: To provide a method for producing a compound represented by the formula (1) which is a 2-pyridone compound useful as a pharmaceutical or an intermediate for a pharmaceutical, etc. at a high yield.
    Type: Application
    Filed: May 11, 2015
    Publication date: September 21, 2017
    Applicant: NISSAN CHEMICAL INDUSTRIES, LTD.
    Inventors: Hironobu YOSHINO, Yasuhiro UMEDA, Jun TAKEOKA, Akihiro NAGAYA, Yudai SUGAWARA, Madoka YOSHINO