Patents by Inventor Andrea Preuss

Andrea Preuss 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).

  • Process for the conditioning of polluted water
    Publication number: 20020153329
    Abstract: The invention relates to a process for the treating or conditioning of polluted water using a source of hydrogen peroxide and/or ozone and a heterogeneous catalyst.
    Type: Application
    Filed: March 25, 2002
    Publication date: October 24, 2002
    Applicant: Degussa AG
    Inventors: Dietmar Hempel, Rainer Krull, Thomas Jung, Andrea Preuss, Henning Raschke, Gerhard Sepp, Matthias Woyciechowski
  • Process for treating waste water
    Patent number: 6325946
    Abstract: Waste waters are treated with hydroxyl producers in the presence of titanium-containing silicates as catalyst.
    Type: Grant
    Filed: June 2, 2000
    Date of Patent: December 4, 2001
    Assignee: Degussa AG
    Inventors: Caspar-Heinrich Finkeldei, Andrea Preuss, Matthias Woyciechowski, Steffen Hasenzahl
  • Aqueous disinfecting agent containing performic acid and peracetic acid process for production and process for use thereof
    Patent number: 6211237
    Abstract: Disinfecting agents according to the invention with a high microbiocidal effect contain up to 5 wt. % performic acid, hydrogen peroxide and peracetic acid. The agents can be obtained by addition of a source of formic acid such as formic acid, a water-soluble salt of the same or a lower formic ester, to an aqueous phase containing 5 to 50 wt. % hydrogen peroxide and 1 to 15 wt. % peracetic acid and, in the case of the addition of a salt, additionally a mineral acid. Preferred agents result from the addition of 0.1 to 1 mole sodium formate or formic acid, per kg of the agent to be produced, to an equilibrium peracetic acid containing mineral acid with 0.5 to 6 wt. % peracetic acid.
    Type: Grant
    Filed: March 23, 1999
    Date of Patent: April 3, 2001
    Assignee: Degussa-Huls AG
    Inventors: Michael Huss, Roland Schneider, Andrea Preuss, Rainer Fuchs
  • Process for the separation of pyrimidine derivatives from aqueous solutions
    Patent number: 6001838
    Abstract: A process for the separation and purification of pyrimidine derivatives, such as tetrahydropyrimidines, in particular 1,4,5,6-tetrahydro-2-methyl-4-pyrimidinecarboxylic acids (ectoine) from aqueous solutions by a combination of adsorption using inorganic solids and crossflow filtration.
    Type: Grant
    Filed: March 18, 1998
    Date of Patent: December 14, 1999
    Assignee: Degussa-Huls AG
    Inventors: Stefan Stockhammer, Wiltrud Treffenfeldt, Andrea Preuss