Patents by Inventor Berndt-Ullrich Köhler

Berndt-Ullrich Köhler 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 processing iron-laden spent sulfuric acid
    Patent number: 7537749
    Abstract: The invention concerns a method for processing heavy metal-laden spent sulfuric acid. For this, iron-laden spent sulfuric acid or iron-laden sulfuric materials obtained therefrom are reacted with a material that contains iron chloride and optionally other metal chlorides, producing iron (II) sulfate. The spent sulfuric acid preferably derives from titanium dioxide production.
    Type: Grant
    Filed: October 1, 2004
    Date of Patent: May 26, 2009
    Assignee: Tronox Pigments GmbH
    Inventors: Gerhard Auer, Berndt-Ullrich Köhler, Benno Laubach