Patents Assigned to Kabushiki Kaisha Ueno Seiyaku Oyo Kenkuyo
  • Process for producing aromatic hydroxycarboxylic acids
    Patent number: 4780567
    Abstract: This invention provides a process for selectively producing aromatic hydroxycarboxylic acids, which comprises subjecting a liquid mixture consisting of a polycyclic aromatic hydrocarbon, an alkali metal salt of an aromatic hydroxy compound and a free aromatic hydroxy compound to a reaction with carbon dioxide. The process permits the production of the intended product with enhanced selectivity.
    Type: Grant
    Filed: July 1, 1986
    Date of Patent: October 25, 1988
    Assignee: Kabushiki Kaisha Ueno Seiyaku Oyo Kenkuyo
    Inventors: Ryuzo Ueno, Toshiharu Kanagae, Mitsuyuki Kishimoto