Patents by Inventor Jun-ichiro Tomaru

Jun-ichiro Tomaru 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 bis(3-amino-4-hydroxyphenyl) compounds
    Patent number: 5977413
    Abstract: Disclosed is a method for producing bis(3-amino-4-hydroxyphenyl) compounds, which comprises reducing bis(3-nitro-4-hydroxyphenyl) compounds with hydrazines in the presence of a catalyst. The method produces bis(3-amino-4-hydroxyphenyl) compounds of high quality under mild conditions at high yields. The products can be isolated and purified in a simple manner to have a higher purity. The method is suitable to industrial-scale production of the products.
    Type: Grant
    Filed: July 28, 1998
    Date of Patent: November 2, 1999
    Assignee: Nippon Kayaku Kabushiki Kaisha
    Inventors: Jun-ichiro Tomaru, Kenji Kunikata, Masaki Fujimoto