Patents Examined by Margaret Eisnmann
  • Dye mixtures of fiber-reactive azo dyes and use thereof for dyeing material containing hydroxy-and/or carboxamido groups
    Patent number: 6159251
    Abstract: The present invention provides a mixture of dyes which comprise one or more monoazo dyestuffs corresponding to the general formula (1) and one or more monoazo dyestuffs corresponding to the formula (2) ##STR1## wherein R1, R2, R3, R4, R5, R6, Y.sub.1, Y.sub.2 and M are defined as given in claim 1, methods for preparing said dye mixtures and methods for dyeing hydroxy and/or carboxamido-containing materials using said dye mixtures.
    Type: Grant
    Filed: October 5, 1999
    Date of Patent: December 12, 2000
    Assignee: Dystar Textilfarbon GmbH & Co. Deutschland KG
    Inventors: Ron Pedemonte, Joachim Steckelberg, Christian Schumacher