Patents by Inventor Kisaburou Shimizu

Kisaburou Shimizu 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).

  • Condensation product of 4,4'-dihydroxydiphenyl sulfone, 4,4'-dihydroxydiphenylsulfone sulfonic acid and a lower aldehyde and method of preparation
    Patent number: 4218366
    Abstract: A fixing agent for improving the fastness properties of dyeings on polyamide fibers being a new condensation product of 4,4'-dihydroxydiphenylsulfone, 4,4'-dihydroxydiphenylsulfonesulfonic acid and a lower aliphatic aldehyde, which has a mean molecular weight of about 5,000 to about 30,000 and a ratio of carbon atom content and sulfur atom content of 3.0:1 to 4.8:1, or its metal salt, and when polyamide fibers are treated with the condensation product or its metal salt, or the condensation product in the presence of a salt of metal, at a temperature of 95.degree. to 120.degree. C., the fastness properties, especially wet-fastness properties of dyeings on polyamide fibers are remarkably improved.
    Type: Grant
    Filed: February 21, 1975
    Date of Patent: August 19, 1980
    Assignee: Dainippon Pharmaceutical Co., Ltd.
    Inventors: Akio Kobayashi, Yoshiyuki Shimohiro, Kisaburou Shimizu, Yoshiaki Murakami
  • Fixing agent for improving fastness properties of dyeings on polyamide fibers and preparation thereof
    Patent number: 4147512
    Abstract: A fixing agent for improving the fastness properties of dyeings on polyamide fibers being a new condensation product of 4,4'-dihydroxydiphenylsulfone, 4,4'-dihydroxydiphenylsulfonesulfonic acid and a lower aliphatic aldehyde, which has a mean molecular weight of about 5,000 to about 30,000 and a ratio of carbon atom content and sulfur atom content of 3.0:1 to 4.8:1, or its metal salt, and when polyamide fibers are treated with the condensation product or its metal salt, or the condensation product in the presence of a salt of metal, at a temperature of 95.degree. to 120.degree. C., the fastness properties, especially wet-fastness properties of dyeings on polyamide fibers are remarkably improved.
    Type: Grant
    Filed: March 2, 1977
    Date of Patent: April 3, 1979
    Assignee: Dainippon Pharmaceutical Co., Ltd.
    Inventors: Akio Kobayashi, Yoshiyuki Shimohiro, Kisaburou Shimizu, Yoshiaki Murakami