Patents by Inventor Noriyuki Yonezawa

Noriyuki Yonezawa 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).

  • Polyamide from optically active, anti head-to-head coumarin dimer
    Patent number: 4975517
    Abstract: A racemic, anti head-to-head coumarin dimer can be separated into its optically active constituents by using an optically active amine. Each optically active isomer can be further reacted with a diamine to afford an optically active polyamide.
    Type: Grant
    Filed: March 26, 1987
    Date of Patent: December 4, 1990
    Assignee: Masaki Hasegawa
    Inventors: Masaki Hasegawa, Kazuhiko Saigou, Noriyuki Yonezawa, Toshio Kanoe, Kazuhiro Sekimoto