Patents by Inventor Hans Prehler

Hans Prehler 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 Bi-Functional Ammonium Nitriles
    Publication number: 20080139838
    Abstract: The invention relates to a method for producing bifunctional ammonium nitriles of the following general formulae: by reacting a tertiary diamine with a cyanomethylene-group-transferring quaternizing agent in a polar, aprotic solvent. Bifunctional ammonium nitriles may be used as bleach activators in detergents and cleaners.
    Type: Application
    Filed: February 24, 2006
    Publication date: June 12, 2008
    Inventors: Gerd Reinhardt, Hans Prehler, Lars Cuypers
  • Use of transition metal complexes as bleach catalysts
    Patent number: 6875734
    Abstract: The use of compounds of the formula (1) M(L)nXm??(1) where M is a metal atom from the group Mn, Fe, Co, Ni, Mo, W, L is a ligand from the group of nitrogen-containing heterocycles, X is chloride, bromide, nitrate, perchlorate, sulfate, ammonia, tetrafluoroborate, hexafluorophosphate or an anion of an organic acid having 1 to 22 carbon atoms, n is a number from 2 to 4 and m is a number from 0 to 4, as catalyst for peroxygen compounds, in particular in washing, bleaching and cleaning compositions is claimed.
    Type: Grant
    Filed: February 2, 2004
    Date of Patent: April 5, 2005
    Assignee: Clariant GmbH
    Inventors: Gerd Reinhardt, Ekaterina Jonas, Daniel Kewitz, Aylin Karadag, Hans Prehler
  • Use of transition metal complexes as bleach catalysts
    Publication number: 20040198626
    Abstract: The use of compounds of the formula (1)
    Type: Application
    Filed: February 2, 2004
    Publication date: October 7, 2004
    Applicant: Clariant GmbH
    Inventors: Gerd Reinhardt, Ekaterina Jonas, Daniel Kewitz, Aylin Karadag, Hans Prehler