Patents by Inventor Hans Christian Wagner

Hans Christian Wagner 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 melem-free melamine and quenching agents
    Patent number: 7176309
    Abstract: The invention relates to a method for producing melem-free melamine by means of aqueous processing of a melted mass of melamine which is obtained using a high-pressure method. According to the inventive method, the melted mass of melamine is quenched by means of an aqueous solution containing alkalis, following the isolation of the off-gases, and is directly transferred into an aqueous alkaline melamine solution, out of which the melamine is then crystallized. The invention thus enables melamine to be obtained, with a melam content of less than 1000 ppm and a melem content of less than 50 ppm. The invention also relates to a quenching agent.
    Type: Grant
    Filed: November 14, 2002
    Date of Patent: February 13, 2007
    Assignee: AMI - Agrolinz Melamine International GmbH
    Inventors: Frank Schröder, Wolfgang Ruech, Christoph Neumüller, Ferdinand Koglgruber, Hans Christian Wagner
  • Method for purifying by-product gases from a melamine manufacturing installation
    Publication number: 20040073027
    Abstract: The invention relates to a method for purifying the by-product gases that originate in a high-pressure melamine manufacturing installation in a urea wet scrubber. According to said method, CO2 is added to the by-product gases before or during their entry into said urea wet scrubber.
    Type: Application
    Filed: December 5, 2003
    Publication date: April 15, 2004
    Inventors: Gerhard Coufal, Hans Christian Wagner, Wolfgang Ruech