Patents Assigned to Osaka-Fu
  • Powder electroluminescent element comprising inorganic electroluminescent particles and a polyurethane binder
    Patent number: 5069815
    Abstract: A powder electroluminescent element which comprises electroluminescent particles and an organic binder at least partly comprising a polyurethane shows a high emission intensity or brightness and has a prolonged operating life.
    Type: Grant
    Filed: December 1, 1989
    Date of Patent: December 3, 1991
    Assignees: Osaka-Fu, Itoh Seiyu Kabushiki Kaisha
    Inventors: Akira Aoki, Yukio Fujishima, Yusuke Makio, Susumu Kusakawa, Sadaaki Tsuji, Tadashi Okamura