Patents by Inventor Noboru Kiyota

Noboru Kiyota 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).

  • Method for producing trimethylhydroquinone
    Patent number: 6441249
    Abstract: An inexpensive method for producing trimethylhydroquinone free from the problem of the disposal of waste catalyst, which method comprises the steps of: (1) reacting isophorone in the presence of an acid catalyst and recovering &bgr;-isophorone by distiiulation, (2) oxidizing the &bgr;-isophorone in the presence of amorphous carbon and a base to obtain 4-oxoisophorone, (3) reacting the 4-oxoisophorone with an acid anhydride in a liquid phase or with a carboxylic acid in a vapor phase in the presence of a solid acid catalyst to obtain trimethylhydroquinones, and (4) hydrolyzing the trimethylhydroquinones to obtaining trimethylhydroquinone.
    Type: Grant
    Filed: June 18, 2001
    Date of Patent: August 27, 2002
    Assignee: Nippon Petrochemicals Company, Limited
    Inventors: Kazuharu Suyama, Noboru Kiyota, Tomohiro Konishi, Yasuo Matsumura
  • Method for producing trimethylhydroquinone
    Patent number: 6320086
    Abstract: An inexpensive method for producing trimethylhydroquinone free from the problem of the disposal of waste catalyst, which method comprises the steps of: (1) reacting isophorone in the presence of an acid catalyst and recovering &bgr;-isophorone by distillation, (2) oxidizing the &bgr;-isophorone in the presence of amorphous carbon and a base to obtain 4-oxoisophorone, (3) reacting the 4-oxoisophorone with an acid anhydride in a liquid phase or with a carboxylic acid in a vapor phase in the presence of a solid acid catalyst to obtain trimethylhydroquinones, and (4) hydrolyzing the trimethylhydroquinones to obtaining trimethylhydroquinone.
    Type: Grant
    Filed: May 17, 2000
    Date of Patent: November 20, 2001
    Assignee: Nippon Petrochemicals Company Limited
    Inventors: Kazuharu Suyama, Noboru Kiyota, Tomohiro Konishi, Yasuo Matsumura
  • Method for producing trimethylhydroquinone
    Publication number: 20010039366
    Abstract: An inexpensive method for producing trimethylhydroquinone free from the problem of the disposal of waste catalyst, which method comprises the steps of: (1) reacting isophorone in the presence of an acid catalyst and recovering &bgr;-isophorone by distiiulation, (2) oxidizing the &bgr;-isophorone in the presence of amorphous carbon and a base to obtain 4-oxoisophorone, (3) reacting the 4-oxoisophorone with an acid anhydride in a liquid phase or with a carboxylic acid in a vapor phase in the presence of a solid acid catalyst to obtain trimethylhydroquinones, and (4) hydrolyzing the trimethylhydroquinones to obtaining trimethylhydroquinone.
    Type: Application
    Filed: June 18, 2001
    Publication date: November 8, 2001
    Applicant: Nippon Petrochemicals Company Limited
    Inventors: Kazuharu Suyama, Noboru Kiyota, Tomohiro Konishi, Yasuo Matsumura
  • Method for producing trimethylhydroquinone
    Patent number: 6211418
    Abstract: An inexpensive method for producing trimethylhydroquinone free from the problem of the disposal of waste catalyst, which method comprises the steps of: (1) reacting isophorone in the presence of an acid catalyst and recovering &bgr;-isophorone by distillation, (2) oxidizing the &bgr;-isophorone in the presence of amorphous carbon and a base to obtain 4-oxoisophorone, (3) reacting the 4-oxoisophorone with an acid anhydride in a liquid phase or with a carboxylic acid in a vapor phase in the presence of a solid acid catalyst to obtain trimethylhydroquinones, and (4) hydrolyzing the trimethylhydroquinones to obtaining trimethylhydroquinone.
    Type: Grant
    Filed: July 28, 1998
    Date of Patent: April 3, 2001
    Assignee: Nippon Petrochemicals Company Limited
    Inventors: Kazuharu Suyama, Noboru Kiyota, Tomohiro Konishi, Yasuo Matsumura