Patents by Inventor Erwin Krusche

Erwin Krusche has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Sulphur dyestuffs which are ready for dyeing, and processes for dyeing and printing with sulphur dyestuffs
    Patent number: 4252533
    Abstract: Dyeing and printing with sulfur dyestuffs involves dissolving the dyestuff by reduction. The dissolved reduced dyestuff is applied to the material to be dyed or printed and the dyestuff is reconverted into in soluble dyestuff by oxidation. The present invention improves the prior art by using as the dyestuff reducing agent a compound of the formula ##STR1## or an alkali metal salt thereof, wherein R is --H or --OH and R' is --H, --CH.sub.3 or --CH.sub.2 OH.
    Type: Grant
    Filed: February 22, 1980
    Date of Patent: February 24, 1981
    Assignee: Cassella Aktiengesellschaft
    Inventors: Christian Heid, Konrad Mix, Heinz Dickmanns, Erwin Krusche
  • Water-soluble trisazo 8-amino-naphthol-1 dyes
    Patent number: 4033945
    Abstract: Very effective direct dyeing of cotton and other hydroxyl- or nitrogen-containing fibers is effected with water-soluble triasazo dyes having the formula:A-N=N-A.sup.1 -N=N-A.sup.2 -N=N-A.sup.3where A is a radical of a diazoconstituent and A.sup.3 is a radical of a coupling constituent ##STR1## and A.sup.1 or A.sup.2 or both can have their azo linkages reversed. These dyes are very fast particularly to washing and to perspiration, and are so effective with cotton that dye baths for such use are rapidly exhausted and the disposal of used bath is less of a problem.
    Type: Grant
    Filed: May 20, 1975
    Date of Patent: July 5, 1977
    Assignee: Cassella Farbwerke Mainkur Aktiengesellschaft
    Inventors: Wolfgang Bauer, Erwin Krusche, Joachim Ribka
  • Fast, brown sulfur dyestuffs and process for the preparation thereof
    Patent number: 3956332
    Abstract: Dyestuffs obtained by sulfurization of at least one compound of the formula ##SPC1##
    Type: Grant
    Filed: June 26, 1974
    Date of Patent: May 11, 1976
    Assignee: Cassella Farbwerke Mainkur Aktiengesellschaft
    Inventors: Erwin Krusche, Joachim Ribka, Eberhard Stier