Patents by Inventor Ikutraro Maruki

Ikutraro Maruki 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 pyromellitic acid
    Patent number: 6888023
    Abstract: A process for producing pyromellitic acid which comprises oxidizing 2,4,5-trimethylbenzaldehyde and/or its oxidized derivative in the presence of a catalyst containing iron, manganese and bromine, or additionally containing zirconium or cerium continuously or semi-continuously using aqueous acetic acid solvent and 0.05-2% by weight of bromide ion. The catalyst used in the present invention has high activity, and the catalyst solution has low corrosive because the reaction is performed at low bromide concentration by using a solvent of aqueous acetic acid. So pyromellitic acid is produced industrially advantageously in high yield continuously or semi-continuously which has been a major difficulty up to now.
    Type: Grant
    Filed: May 19, 2003
    Date of Patent: May 3, 2005
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Kazuo Tanaka, Hiroshi Ogawa, Ikutraro Maruki, Atsushi Okoshi
  • Process for producing pyromellitic acid
    Publication number: 20030208091
    Abstract: A process for producing pyromellitic acid which comprises oxidizing 2,4,5-trimethylbenzealdehyde and/or its oxidized derivative in the presence of a catalyst containing iron, manganese and bromine, or additionally containing zirconium or cerium continuously or semi-continuously using aqueous acetic acid solvent and 0.05-2% by weight of bromide ion. The catalyst used in the present invention has high activity, and the catalyst solution has low corrosive because the reaction is performed at low bromide concentration by using a solvent of aqueous acetic acid. So pyromellitic acid is produced industrially advantageously in high yield continuously or semi-continuously which has been a major difficulty up to now.
    Type: Application
    Filed: May 19, 2003
    Publication date: November 6, 2003
    Inventors: Kazuo Tanaka, Hiroshi Ogawa, Ikutraro Maruki, Atsushi Okoshi
  • Process for producing pyromellitic acid
    Publication number: 20020151745
    Abstract: A process for producing pyromellitic acid which comprises oxidizing 2,4,5-trimethylbenzealdehyde and/or its oxidized derivative in the presence of a catalyst containing iron, manganese and bromine, or additionally containing zirconium or cerium continuously or semi-continuously using aqueous acetic acid solvent and 0.05-2% by weight of bromide ion. The catalyst used in the present invention has high activity, and the catalyst solution has low corrosive because the reaction is performed at low bromide concentration by using a solvent of aqueous acetic acid. So pyromellitic acid is produced industrially advantageously in high yield continuously or semi-continuously which has been a major difficulty up to now.
    Type: Application
    Filed: February 28, 2002
    Publication date: October 17, 2002
    Inventors: Kazuo Tanaka, Hiroshi Ogawa, Ikutraro Maruki, Atsushi Okoshi