Patents Assigned to Verein Zur Forderung der Forschung und Entwicklung in der Textilwirtschaft
  • Process for reduction of textile dyestuffs
    Patent number: 5443599
    Abstract: A process comprising the reduction of textile dyestuffs in an aqueous alkaline medium by means of a reducing compound which is a complex of an organic complexing agent and an iron (II)-salt. The iron (II)-salt is present in an amount sufficient to ensure the desired reduction of the dyestuff after a single oxidation.
    Type: Grant
    Filed: December 19, 1994
    Date of Patent: August 22, 1995
    Assignee: Verein zur Forderung der Forschung und Entwicklung in der Textilwirtschaft
    Inventors: Thomas Bechtold, Eduard Burtscher
  • Process for the reduction of dyes
    Patent number: 5244549
    Abstract: In a process for reducing dyes in aqueous solution, a pair of electrodes is immersed in the solution. The cathode potential is maintained below the value at which hydrogen is evolved. A reducing agent is used, the redox potential of which, increased by the charge transfer overvoltage required for the reduction of the oxidized form of the reducing agent to the reduced form at the cathode, is less than the cathode potential.
    Type: Grant
    Filed: January 29, 1991
    Date of Patent: September 14, 1993
    Assignee: Verein Zur Forderung der Forschung und Entwicklung in der Textilwirtschaft
    Inventor: Thomas Bechtold