Patents Assigned to Polaroid Corporaton
  • Chrome complexed azo or azomethine hexadentate dyes
    Patent number: 4404136
    Abstract: Chrome-complexed hexadentate dyes which include an ortho, ortho-dihydroxy azo or azomethine dye moiety, a colorless ligand which is a radical of an iminodiacetic acid and a linkage connecting the ligand to the dye moiety. In one embodiment the dyes include a photographically useful group and are also useful in photographic applications.
    Type: Grant
    Filed: December 14, 1981
    Date of Patent: September 13, 1983
    Assignee: Polaroid Corporaton
    Inventors: Elbert M. Idelson, Patrick F. King