Patents Examined by Mark Noel
  • Ultraviolet light absorbers having two different chromophors in the same molecule
    Patent number: 4745194
    Abstract: Ultraviolet light absorbing compounds having two different chromophors in the same molecule, particularly the benzotriazole chromophor and either the dihydroxybenzophenone or dihydroxyacetophenone chromophor; specifically, the two compounds 3,5-[di(2H-benzotriazole-2-yl)]-2,4-dihydroxyacetophenone and 3,5-[di(2H-benzotriazole-2-yl)]2,4-dihydroxybenzophenone.
    Type: Grant
    Filed: October 6, 1983
    Date of Patent: May 17, 1988
    Assignee: The United States of America as represented by the United States Department of Energy
    Inventors: Otto Vogl, Shanjun Li