Patents Assigned to Asahi Kasei K. K.
  • Photochromic method involving an aromatic amine
    Patent number: 4205988
    Abstract: Photochromic method utilizing photochromic compositions in which the intensity of color generation is not proportional to light intensity which are produced by incorporating an aromatic amine with a low ionization potential, up to 7.6 EV so that it can be ionized by biphotonic absorption into a stabilizing polymer matrix.
    Type: Grant
    Filed: April 30, 1979
    Date of Patent: June 3, 1980
    Assignee: Asahi Kasei K. K.
    Inventors: Masaru Ozaki, Koichi Mori, Masatsugu Yoshino