Patents by Inventor Eiko Nakatu

Eiko Nakatu 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 producing 2-methyl-1,4-benzoquinone
    Patent number: 5932753
    Abstract: A process for producing 2-methyl-1,4-benzoquinone at a high conversion, a high selectivity and at a low cost by oxidizing m-cresol with oxygen at a low partial pressure in the presence of at least one copper (I) halide catalyst and a mixed solvent of ketone and acetonitrile. The 2-methyl-1,4-benzoquinone is useful as an intermediate compound to produce vitamin K.
    Type: Grant
    Filed: February 9, 1998
    Date of Patent: August 3, 1999
    Assignee: Chuo Chemical Co., Inc.
    Inventors: Kenji Onodera, Eiko Nakatu, Masayuki Kobayashi