Patents by Inventor Rikinori Terakado

Rikinori Terakado 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 introducing a carboxyl group to an aromatic carboxylic acid or a derivative thereof
    Patent number: 5319134
    Abstract: Disclosed is a process for introducing a carboxyl group to an aromatic carboxylic acid or a derivative thereof, which comprises reacting a starting aromatic carboxylic acid, such as a benzoic acid, a biphenylcarboxylic acid, a naphthalenecarboxylic acid, a diphenylcarboxylic acid, or a derivative thereof, with a carbon tetrahalide in the presence of a cyclodextrin and an alkali metal hydroxide, thereby introducing a carboxyl group to the aromatic ring of the starting aromatic carboxylic acid or the derivative thereof in substitution for a hydrogen atom bonded thereto. By the process of the present invention, a desired aromatic polycarboxylic acid or a derivative thereof can be easily obtained with high selectivity.
    Type: Grant
    Filed: October 26, 1992
    Date of Patent: June 7, 1994
    Assignee: Hidefumi Hirai
    Inventors: Hidefumi Hirai, Rikinori Terakado, Hisashi Mihori, Tsutomu Nakamura, Kazuhiro Saito