Patents by Inventor Ernst-Jürgen Lehmann

Ernst-Jürgen Lehmann 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 preparing mono-, Di- or oligoamide alkoxylates
    Patent number: 6211409
    Abstract: A process is disclosed for preparing di- or oligoamide alkoxylates. Diamides are prepared from carboxylic acids or carboxylic acid alkyl esters and di-, oligo-, or polyamines and are alkoxylated as a melt directly after their preparation, without any further intermediate preparation process.
    Type: Grant
    Filed: August 27, 1999
    Date of Patent: April 3, 2001
    Assignee: RWE-DEA Aktiengesellschaft fuer Mineraloel und Chemie
    Inventors: Ulrike Jacobs, Uwe Kaltwasser, Klaus Kwetkat, Ernst-Jürgen Lehmann