Patents Assigned to Herbert Kubler
  • Cyanine dyes
    Patent number: 5214164
    Abstract: The present invention relates to chemical substances having dye properties, or more particularly, to improved cyanine dyes and to their application in photographic bleaching processes. Preferably, a chromylium group on the hetero ring comprises either a substituted phenyl group or an alkyl group. More particularly, O-halogenated phenyl and t-butyl groups have proven to be advantageous substituents.
    Type: Grant
    Filed: December 19, 1989
    Date of Patent: May 25, 1993
    Assignees: Herbert Kubler, Karl-Heinz Drexhage
    Inventors: Karl-Heinz Drexhage, Elisabeth Drexhage