Patents by Inventor Rudolf Krüger

Rudolf Krüger 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).

  • Method for producing aqueous alkaline solutions or reduced indigoid dyes
    Patent number: 6767448
    Abstract: From 5 to 60% by weight aqueous alkaline solutions of reduced indigoid dyes are prepared by reducing the indigoid dye electrochemically in the presence of a mediator.
    Type: Grant
    Filed: October 25, 2001
    Date of Patent: July 27, 2004
    Assignee: DyStar Textilfarben GmbH & Co. Deutschland KG
    Inventors: Thomas Bechtold, Rudolf Krüger, Hans-Peter Maier, Georg Schnitzer, Franz Sütsch, Wolfgang Schrott, Norbert Grund
  • Reduction clearing of polyester textiles
    Patent number: 6730132
    Abstract: A process for reduction clearing dyed or printed polyester textiles, which comprises adding, to an acidic dyeing liquor or a wash bath, an aftertreatment composition comprising as components a) at least one compound of the formula (I) Am[(CR1R2)mSO2M]p,q  (I)  where A is NR33−q or OR42−p; p,q means q when A is NR33−q, and p when A is OR42−p; R1, R2, R4 are each hydrogen or C1-C6-alkyl; R3 represents identical or different radicals selected from the group consisting of hydrogen, C1-C20-alkyl, C3-C8-cycloalkyl opt.
    Type: Grant
    Filed: January 22, 1999
    Date of Patent: May 4, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Eberhard Beckmann, Rudolf Krüger, Ulrich Karl, Claus Tritschler
  • Concentrated leucoindigo solutions
    Patent number: 6428581
    Abstract: Concentrated leuco indigo solutions useful for dyeing cellulosic textile material consist essentially of from 25 to 55% by weight of leuco indigo in the form of the leuco indigo salt, an amount which is essentially stoichiometrically sufficient to convert the leuco indigo into the neutral leuco indigo salt of a mixture of at least two alkali metal hydroxides wherein none of the alkali metal hydroxides accounts for more than 70 mol %, and water.
    Type: Grant
    Filed: January 12, 2001
    Date of Patent: August 6, 2002
    Assignee: DyStar Textilfarben GmbH & Co. Deutschland KG
    Inventors: Manfred Gäng, Rudolf Krüger, Peter Miederer
  • Composition containing at least one sulfinic derivative and potassium carbonate
    Patent number: 6353131
    Abstract: Sulfinic derivatives such as zinc dithionite, sodium dithionite, zinc or sodium hydroxymethyl sulfinate or zinc or sodium hydroxy-ethyl sulfinate, their condensation products with ammonia, and aminoiminomethanesulfinic acid are stabilized to degradation by admixture of potassium carbonate.
    Type: Grant
    Filed: March 14, 2000
    Date of Patent: March 5, 2002
    Assignee: BASF Aktiengesellschaft
    Inventors: Eberhard Beckmann, Rudolf Krüger
  • Dyeing cellulose-containing textile material with hydrogenated indigo
    Patent number: 5586992
    Abstract: A process for dyeing celluose-containing textile material with indigo comprises using an aqueous solution of leuco indigo prepared by catalytic hydrogenation and, after the leuco indigo has gone onto the textile material, converting it back into the pigment form in a conventional manner by air oxidation.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: December 24, 1996
    Assignee: BASF Aktiengesellschaft
    Inventors: Georg Schnitzer, Franz Suetsch, Michael Schmitt, Erich Kromm, Harald Schlueter, Rudolf Krueger, Andreas Weiper-Idelmann