Patents by Inventor Mutsumi Sugawara

Mutsumi Sugawara 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 chlorosulfonyl isocyanate
    Patent number: 7468174
    Abstract: A method for producing chlorosulfonyl isocyanate by reaction of sulfur trioxide with cyanogen chloride, wherein chlorosulfonyl isocyanate or a solution including chlorosulfonyl isocyanate is used as a reaction solvent, sulfur trioxide and cyanogen chloride which are respectively diluted with the chlorosulfonyl isocyanate or the solution including chlorosulfonyl isocyanate are added at the same time to a reaction system in an almost equimolar amount under reflux. By the production method of present invention, chlorosulfonyl isocyanate can be produced from sulfur trioxide and cyanogen chloride in which the yield of the chlorosulfonyl isocyanate is high, the method has excellent operability, number of equipments is reduced, and time for controlling the temperature is saved.
    Type: Grant
    Filed: December 15, 2004
    Date of Patent: December 23, 2008
    Assignee: Nippon Soda Co., Ltd.
    Inventors: Mutsumi Sugawara, Tsutomu Imagawa, Fumitaka Masui
  • Method for Producing Chlorosulfonyl Isocyanate
    Publication number: 20070286789
    Abstract: A method for producing chlorosulfonyl isocyanate by reaction of sulfur trioxide with cyanogen chloride, wherein chlorosulfonyl isocyanate or a solution including chlorosulfonyl isocyanate is used as a reaction solvent, sulfur trioxide and cyanogen chloride which are respectively diluted with the chlorosulfonyl isocyanate or the solution including chlorosulfonyl isocyanate are added at the same time to a reaction system in an almost equimolar amount under reflux. By the production method of present invention, chlorosulfonyl isocyanate can be produced from sulfur trioxide and cyanogen chloride in which the yield of the chlorosulfonyl isocyanate is high, the method has excellent operability, number of equipments is reduced, and time for controlling the temperature is saved.
    Type: Application
    Filed: December 15, 2004
    Publication date: December 13, 2007
    Applicant: Nippon Soda Co., Ltd.
    Inventors: Mutsumi Sugawara, Tsutomu Imagawa, Fumitaka Masui