Patents by Inventor Harald Petersen

Harald Petersen 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).

  • Continuous isothermal process for preparing mononitrotoluenes
    Patent number: 6583327
    Abstract: The present invention relates to a process for the continuous isothermal preparation of mononitrotoluenes with concentration of the resultant waste sulfuric acid and recycling of the concentrated waste sulfuric acid to the process.
    Type: Grant
    Filed: October 26, 2001
    Date of Patent: June 24, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Ralf Demuth, Frank Döbert, Harald Petersen, Georg Ronge, Hans-Martin Weber, Thomas Würminghausen, Eberhard Zirngiebl
  • Continuous isothermal process for preparing mononitrotoluenes
    Publication number: 20020091290
    Abstract: The present invention relates to a process for the continuous isothermal preparation of mononitrotoluenes with concentration of the resultant waste sulfuric acid and recycling of the concentrated waste sulfuric acid to the process.
    Type: Application
    Filed: October 26, 2001
    Publication date: July 11, 2002
    Inventors: Ralf Demuth, Frank Dobert, Harald Petersen, Georg Ronge, Hans-Martin Weber, Thomas Wurminghausen, Eberhard Zirngiebl
  • Process for the production of aqueous polyurethane dispersions
    Patent number: 4921842
    Abstract: The present invention relates to a process for the continuous production of aqueous polyurethane dispersions, i.e. dispersions or suspensions both of pure polyurethanes and of polyurethane ureas, by mixing a product, which has been obtained by reaction of polyisocyanates with compounds having a molecular weight of 400 to about 10,000 and containing at least two isocyanate-reactive groups, with water, characterized in that the mixing of the polyisocyanate reaction product with water is carried out in a co-current reactor, one of the components to be mixed or a mixture containing one of the two components to be mixed being compressed to an initilal pressure of from about 20 to 500 bar and expanded through a coaxially arranged nozzle into the short residence time mixing tube where it is mixed with the other component or with a mixture containing the other component.
    Type: Grant
    Filed: August 9, 1988
    Date of Patent: May 1, 1990
    Assignee: Bayer Aktiengessellschaft
    Inventors: Wolfgang Henning, Harald Petersen, Gerhard Moormann