Patents by Inventor Akiko Kuroyanagi

Akiko Kuroyanagi 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 producing flame resistant polyester
    Patent number: 4940772
    Abstract: A polyester, wherein pendent phosphorus atoms are bound to the main chain of the polyester, having an excellent flame resistance and a high intrinsic viscosity can be stably produced without deteriorating the properties of said polyester by preliminarily copolymerizing a polyester with a specific unsaturated compound and then reacting the unsaturated bond thus-formed with a specific phosphorus compound having a P-H bond.
    Type: Grant
    Filed: November 20, 1989
    Date of Patent: July 10, 1990
    Assignee: Nippon Ester Co., Ltd.
    Inventors: Tetsuo Matsumoto, Keizo Tsujimoto, Katsuto Matsuzawa, Shunichiro Hamada, Kouzi Shinogi, Satomi Nagai, Takayuki Imamura, Akiko Kuroyanagi