Patents by Inventor Kirosuke Kawabata

Kirosuke Kawabata 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).

  • Calixarene derivatives and process for the preparation thereof
    Patent number: 5231196
    Abstract: The present invention relates to an improvement in the process for preparing a calixarene derivative in which the rotation of its benzene units are hindered and which comprises replacing all or a part of the hydrogen atoms of the hydroxyl groups of a calixarene derivative represented by the general formula: ##STR1## and is characterized by conducting the reaction in the presence of an alkaline earth metal. According to the present invention, an asymmetric calixarene derivative having a "cone" conformation can be selectively prepared by virtue of the template effect of the metal.
    Type: Grant
    Filed: December 14, 1990
    Date of Patent: July 27, 1993
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Seiji Shinkai, Tsutomu Matsuda, Takashi Arimura, Kirosuke Kawabata, Kozo Tachibana