Patents Assigned to Clariant International, Ltd. Muttenz
  • Triphendioxazine pigments
    Patent number: 6214989
    Abstract: Carbamate group-containing triphendioxazine compounds of the formula (I) where the nuclei designated A and B, as defined in claim 1, contain fused-on rings and R1, R2 and R3 have the meanings specified in claim 1, are good pigments and are convertible into the corresponding triphendioxazine pigments without carbamate groups.
    Type: Grant
    Filed: March 24, 1999
    Date of Patent: April 10, 2001
    Assignee: Clariant International, Ltd. Muttenz
    Inventors: Bansi Lal Kaul, Bruno Piastra