Patents by Inventor Yuuichi Matsunaga

Yuuichi Matsunaga 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).

  • Preparation of cyclic carbonates
    Patent number: 4880942
    Abstract: Cyclic carbonates are prepared by reacting a 1,3-diol or 1,2-diol with a dialkylcarbonate in the presence of a basic catalyst. They are obtained in higher yields with higher purity by subjecting the reaction mixture to heat aging under vacuum in the presence of the basic catalyst, and recovering the cyclic carbonate from the mixture.
    Type: Grant
    Filed: July 21, 1988
    Date of Patent: November 14, 1989
    Assignee: Mitsui Petrochemical Industries, Ltd.
    Inventors: Yoshihisa Kiso, Yuuichi Matsunaga, Masao Imagawa