Patents by Inventor Ryusuke Shigematsu

Ryusuke Shigematsu 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 isomerizing dimethylnaphthalene
    Patent number: 5481055
    Abstract: A method for isomerizing dimethylnaphthalene (DMN) in the gaseous phase in the presence of a solvent comprising an aromatic hydrocarbon having a boiling point of at most 150.degree. C., e.g., benzene, under atmospheric pressure by using a catalyst comprising a hydrogen-form of mordenite. According to the method, the objective 2,6-DMN can be produced with a minimal content of impurities and the 2,6-DMN can be stably produced in high selectivity and high yield under mild reaction conditions for a long period of time, while suppressing side reactions.
    Type: Grant
    Filed: March 20, 1995
    Date of Patent: January 2, 1996
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Makoto Takagawa, Ryusuke Shigematsu, Takayo Sasaki