Patents by Inventor Keisuke Shimokawa

Keisuke Shimokawa 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 carbonate compound and method for producing aromatic polycarbonate
    Patent number: 9221740
    Abstract: The present invention relates to a method for producing a carbonate compound containing: a first step of reacting a compound represented by the following Formula (1) with a compound represented by the following Formula (21) or a compound represented by the following Formula (22) to obtain a reaction mixture containing a carbonate compound, and a second step of bringing the reaction mixture containing a carbonate compound into contact with a strongly basic compound, in which R1 represents a monovalent organic group, and R2 represents a divalent organic group.
    Type: Grant
    Filed: February 9, 2015
    Date of Patent: December 29, 2015
    Assignee: ASAHI GLASS COMPANY, LIMITED
    Inventors: Hidekazu Okamoto, Atsushi Fujimori, Toru Takahashi, Keisuke Shimokawa, Atsushi Hirashima
  • METHOD FOR PRODUCING CARBONATE COMPOUND AND METHOD FOR PRODUCING AROMATIC POLYCARBONATE
    Publication number: 20150152037
    Abstract: The present invention relates to a method for producing a carbonate compound containing: a first step of reacting a compound represented by the following Formula (1) with a compound represented by the following Formula (21) or a compound represented by the following Formula (22) to obtain a reaction mixture containing a carbonate compound, and a second step of bringing the reaction mixture containing a carbonate compound into contact with a strongly basic compound, in which R1 represents a monovalent organic group, and R2 represents a divalent organic group.
    Type: Application
    Filed: February 9, 2015
    Publication date: June 4, 2015
    Inventors: Hidekazu OKAMOTO, Atsushi Fujimori, Toru Takahashi, Keisuke Shimokawa, Atsushi Hirashima