Patents by Inventor Makiko Koyama

Makiko Koyama 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 producing polybenzazole
    Patent number: 6169165
    Abstract: A method for producing polybenzazole in the presence of iron(II) ion. The polybenzazole obtained by this method can be formed into a highly strong fiber having a high elastic modulus and a heat resistant film. The method enables economical production of polybenzazole having fine tone and high polymerization degree.
    Type: Grant
    Filed: December 23, 1998
    Date of Patent: January 2, 2001
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Fuyuhiko Kubota, Masahiko Fukushima, Makiko Koyama