Patents by Inventor Hiroshii Kimura

Hiroshii Kimura 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).

  • Process for the preparation of indoles
    Patent number: 4727161
    Abstract: A process for producing an indole which comprises reacting an aniline and a diol in the presence of a catalyst to produce a reaction mixture containing the indole, unreacted aniline and by-products, condensing the reaction mixture to obtain a liquid reaction product, recovering the unreacted aniline from the liquid reaction product, reducing the contents of specified by-products in the recovered aniline below specified levels and reutilizing the resulting recovered aniline. To reduce the contents of the specified by-products in the recovered aniline below specified levels, it is preferred to subject the liquid reaction product or an aniline fraction separated therefrom to a heat-treatment and then to distillation. In the above manner, the recovered aniline can be reutilized in the reaction without causing the activity of the catalyst to deteriorate.
    Type: Grant
    Filed: November 15, 1985
    Date of Patent: February 23, 1988
    Assignee: Mitsui Toatsu Chemicals, Incorporated
    Inventors: Atsuyoshi Yamauchi, Seiya Iguchi, Yuzo Ono, Hiroshii Kimura, Satoshi Morita