Patents by Inventor Hans-Jürgen Letsch

Hans-Jürgen Letsch 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 metal-free Guerbet alcohols
    Patent number: 6419797
    Abstract: There is provided a process for producing Guerbet alcohols not containing any heavy metals or soaps, wherein primary and/or secondary alcohols having 2 to 30 carbon atoms are condensed at elevated temperature in the presence of alkaline catalysts and/or heavy metal catalysts while eliminating the reaction water, and the reaction product is immediately separated by distillation without any additional purification.
    Type: Grant
    Filed: February 11, 2000
    Date of Patent: July 16, 2002
    Assignee: Sasöl Germany GmbH
    Inventors: Erich Scherf, Hans-Jürgen Letsch, Clemens Schröder, Albert Thomas Herrmann