Patents by Inventor Syungo Nara

Syungo Nara 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).

  • Granules of 2-hydroxynaphthalene-3-carboxylic acid and method for preparing the same
    Patent number: 6562998
    Abstract: Granular product of 2-hydroxynaphthalene-3-carboxylic acid with well-suppressed dusting tendency, and process for preparing the same is provided. Granular product of 2-hydroxynaphthalene-3-carboxylic acid having an average particle size of 150 &mgr;m or more and a hardness of 70-3000 g, and a process for preparing the same comprising the steps of dry compressing powdery 2-hydroxynaphthalene-3-carboxylic acid to give compressed material and pulverizing and classifying the same.
    Type: Grant
    Filed: June 26, 2001
    Date of Patent: May 13, 2003
    Assignee: Kabushiki Kaisha Ueno Seiyako Oyo Kenkyujo
    Inventors: Ryuzo Ueno, Masaya Kitayama, Nobutaka Izumichi, Syungo Nara, Masaharu Kittaka
  • Process for producing 2-hydroxynaphthalene-3,6-dicarboxylic acid
    Patent number: 6133475
    Abstract: The present invention relates to a process for preparing 2-hydroxynaphthalene-3,6-dicarboxylic acid which comprises reacting potassium 2-naphtholate and carbon dioxide at a temperature 290.degree. C. or higher under a pressure 30 kg/cm.sup.2 (G) or higher. According to this process, 2-hydroxynaphthalene-3,6-dicarboxylic acid can be obtained in high yield.
    Type: Grant
    Filed: June 16, 1998
    Date of Patent: October 17, 2000
    Assignee: Kabushiki Kaisha Ueno Seiyaku Oyo Kenkujo
    Inventors: Ryuzo Ueno, Masaya Kitayama, Yoshiro Uchiyama, Syungo Nara