Patents by Inventor Norbert Doerpinghaus

Norbert Doerpinghaus 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 purifying fatty acid amides
    Patent number: 5419815
    Abstract: The present invention relates to a process for purifying fatty acid amides, which contains the following process steps:neutralization of the fatty acid by addition of an aqueous alkaline solution andsubsequent distillation of the neutralized mixture.
    Type: Grant
    Filed: August 12, 1993
    Date of Patent: May 30, 1995
    Assignee: Hoechst AG
    Inventors: Norbert Doerpinghaus, Siegbert Rittner