Patents Assigned to Masaki Hasegawa
  • 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