Patents by Inventor Akihiro Nishiuchi

Akihiro Nishiuchi 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 preparing diphenyl sulfonetetracarboxylic acid
    Patent number: 5091564
    Abstract: Disclosed is a process for preparing a diphenyl sulfonetetracarboxylic acid, the process comprising oxidizing a tetramethyldiphenyl sulfone with oxygen or an oxygen-containing gas in an aliphatic monocarboxylic acid having 2 to 10 carbon atoms in the presence of a catalyst consisting essentially of a cobalt component, a manganese component and a bromine compound wherein the weight ratio of manganese metal to cobalt metal is in the range of approximately 0.01 to 0.5.
    Type: Grant
    Filed: September 20, 1990
    Date of Patent: February 25, 1992
    Assignee: New Japan Chemical Co., Ltd.
    Inventors: Hiroshi Manami, Mikio Nakazawa, Shigeo Miki, Akihiro Nishiuchi