Patents Examined by D. Garrett
  • Fluorescence-reddening membrane and red-emitting device
    Patent number: 6221517
    Abstract: The present invention provides a fluorescence-reddening membrane which is made up of a light-transmittable medium and, dispersed therein, (a) a rhodamine base fluorescence pigment and (b) a fluorescence pigment which has absorptions in the blue region and induces energy transfer to and reabsorptions from the rhodamine base fluorescence lamp at high conversion effieciencies.
    Type: Grant
    Filed: August 7, 1998
    Date of Patent: April 24, 2001
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Mitsuru Eida, Hidetsugu Ikeda, Jun Tsuchiya