Patents by Inventor Kazuo Kuniyoshi

Kazuo Kuniyoshi 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 purifying 11-cyano-undecanoic acid
    Patent number: 3994942
    Abstract: 11-cyano-undecanoic acid having a high purity of 99% or more is obtained by the steps of dissolving a crude 11-cyano-undecanoic acid in the form of free acid or its ammonium salt into a mixture solvent consisting of acetic acid or propionic acid and water in a mixing ratio by weight of 1 : 0.05 to 3; bringing a refining gas containing therein ozone into contact with said solution in order to decompose impurities, especially, coloring substances in said solution, and; crystallizing and separating the purified 11-cyano-undecanoic acid from said solution.
    Type: Grant
    Filed: January 23, 1975
    Date of Patent: November 30, 1976
    Assignee: UBE Industries, Ltd.
    Inventors: Kenji Nishimura, Shinichi Furusaki, Kazuo Kuniyoshi
  • Method for refining 11-cyano-undecanoic acid
    Patent number: 3987071
    Abstract: A crude 11-cyano-undecanoic acid in the form of the free acid or its ammonium salt is refined by bringing a refining gas containing ozone therein into contact with a solution of the crude 11-cyano-undecanoic acid or its ammonium salt in a substantially anhydrous organic solvent which is non-reactive with the ozone at a temperature of 0.degree. to 100.degree. C, for example, formic acid, acetic acid, propionic acid, chloroform, tetrachloromethane, dichloroethane or trichloroethane.
    Type: Grant
    Filed: January 23, 1975
    Date of Patent: October 19, 1976
    Assignee: UBE Industries, Ltd.
    Inventors: Kenji Nishimura, Shinichi Furusaki, Kazuo Kuniyoshi