Patents Assigned to Nichia Denshi Kagaku Co., Ltd.
  • Patent number: 4423349
    Abstract: A green light-emitting fluorescent material prepared from terbium-activated lanthanum cerium orthophosphate expressed by the structural formula:La.sub.x Tb.sub.y Ce.sub.z PO.sub.4where:x+y+z=10.05<x<0.350.05<y<0.30.6<z<0.9and a fluorescent lamp comprising said green light-emitting fluorescent material used alone or in combination with any other form of fluorescent material.
    Type: Grant
    Filed: July 1, 1981
    Date of Patent: December 27, 1983
    Assignee: Nichia Denshi Kagaku Co., Ltd.
    Inventors: Shigeharu Nakajima, Keiji Ichinomiya, Koichi Okada, Kaname Tsuchikura, Minoru Kashiwagi