Patents by Inventor Stefan Purps

Stefan Purps 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 sorbic acid by thermal cleavage
    Patent number: 6673963
    Abstract: The invention relates to a process for preparing sorbic acid by thermal cleavage in a solvent of the polyester prepared from crotonaldehyde and ketene, the cleavage of the polyester being carried out in the presence of 20 to 100% by weight of a secondary or tertiary aliphatic, alicyclic nitrogen- and/or oxygen-containing amine, or aliphatic-aromatic substituted amine, as catalyst.
    Type: Grant
    Filed: September 9, 2002
    Date of Patent: January 6, 2004
    Assignee: Nutrinova Nutrition Specialties & Food Ingredients GmbH
    Inventors: Daniel Decker, Guenter Roscher, Christoph Mollenkopf, Erwin Weiss, Stefan Purps
  • Process for preparing sorbic acid from sorbic acid polyester
    Publication number: 20030065218
    Abstract: The invention relates to a process for preparing sorbic acid by cleaving the sorbic acid polyester prepared from crotonaldehyde and ketene, the sorbic acid polyester being distilled and the cleavage being catalyzed by an amine, which comprises separating off the amine from the distillation residue by distillation under reduced pressure and at a temperature which is higher than the temperature of the polyester distillation and recovering it.
    Type: Application
    Filed: September 9, 2002
    Publication date: April 3, 2003
    Inventors: Christoph Mollenkopf, Erwin Weiss, Thomas Beck, Andreas Schneider, Klaus Fahrner, Stefan Purps
  • Process for preparing sorbic acid by thermal cleavage
    Publication number: 20030060658
    Abstract: The invention relates to a process for preparing sorbic acid by thermal cleavage in a solvent of the polyester prepared from crotonaldehyde and ketene, the cleavage of the polyester being carried out in the presence of 20 to 100% by weight of a secondary or tertiary aliphatic, alicyclic nitrogen- and/or oxygen-containing amine, or aliphatic-aromatic substituted amine, as catalyst.
    Type: Application
    Filed: September 9, 2002
    Publication date: March 27, 2003
    Inventors: Daniel Decker, Guenter Roscher, Christoph Mollenkopf, Erwin Weiss, Stefan Purps