Patents by Inventor Yoshihiko Kuwae

Yoshihiko Kuwae 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 production of aromatic hydroxycarboxylic acid
    Patent number: 4966992
    Abstract: The present invention provides a method of production of aromatic hydroxycarboxylic acids by the reaction of alkaline metal salts of phenols or naphthols with carbon dioxide, in which free phenols or free naphthols produced as by-products in the reaction system are removed from the system so as to control the content of free phenols or free naphthols at a suitable level, by which a purer objective compound can be obtained at high yield under the condition of lower temperature and shorter time.
    Type: Grant
    Filed: January 18, 1989
    Date of Patent: October 30, 1990
    Assignee: Kabushiki Kaisha Ueno Seiyaku Oyo Kenkyujo
    Inventors: Ryuzo Ueno, Yoshiyasu Masada, Yoshihiko Kuwae, Keiji Kawata
  • Process for preparing 2-hydroxynaphthalenecarboxylic acids
    Patent number: 4239913
    Abstract: A process for preparing 2-hydroxynaphthalenecarboxylic acids which comprises reacting a liquid mixture of 1 mole of an alkali .beta.-naphtholate, 0.05 to 3 moles of .beta.-naphthol, and 0.1 to 5 times the weight of the alkali .beta.-naphtholate of light oil or kerosene with carbon dioxide under a carbon dioxide pressure of not more than 15 kg/cm.sup.2.G at a temperature of at least 180.degree. C.
    Type: Grant
    Filed: August 15, 1978
    Date of Patent: December 16, 1980
    Assignee: Kabushiki Kaisha Veno Seiyaku Oyo Kenkyujo
    Inventors: Ryuzo Ueno, Hiroaki Tsuchiya, Yasukazu Muramoto, Yoshihiko Kuwae