Patents Assigned to Coöperatie Rubia U.A.
  • Method for the production of a dye preparation based on madder root
    Patent number: 6596036
    Abstract: The present invention relates to a method for the production of a dye preparation from madder root, comprising extraction of madder root in water at a temperature below 70-75° C., preferably below 65° C., while providing oxygen to the reaction mixture of madder root in water to obtain the dye preparation and to the dye preparation thus obtained.
    Type: Grant
    Filed: September 25, 2001
    Date of Patent: July 22, 2003
    Assignee: Coöperatie Rubia U.A.
    Inventors: Goverdina Christina Helena Derksen, Teris André Van Beek, Aede De Groot, Anthony Capelle