Patents by Inventor Stephan Klein

Stephan Klein 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 production of diaminodiphenylmethanes
    Publication number: 20030023116
    Abstract: The present invention concerns a process for the production of methylenedianiline (MDA) having a high monomer content.
    Type: Application
    Filed: August 7, 2002
    Publication date: January 30, 2003
    Inventors: Stephan Klein, Dirk Grotjohann, Christine Mendoza-Frohn, Daniel Koch, Heinz-Herbert Mller, Hans-Georg Pirkl, Rudolf Uchdorf
  • Process for the preparation of macrocyclic esters
    Patent number: 6458972
    Abstract: Macrocyclic ester compounds can be prepared from oligoesters by thermal cleavage in the presence of a thermostable benzene derivative.
    Type: Grant
    Filed: August 21, 2001
    Date of Patent: October 1, 2002
    Assignee: Haarmann & Reimer GmbH
    Inventors: Horst Surburg, Dirk Müller, Stephan Klein, Christine Mendoza-Frohn, Georg Ronge, Kai Verkerk
  • Cinnamic esters
    Publication number: 20020133038
    Abstract: In a novel process for the synthesis of cinnamic esters or substituted cinnamic esters, carboxylic esters are reacted, by condensation, with benzaldehyde or substituted benzaldehydes, respectively, in the presence of a solid with basic properties.
    Type: Application
    Filed: September 5, 2001
    Publication date: September 19, 2002
    Inventors: Walter Kuhn, Gerhard Braun, Stephan Klein
  • Process for the preparation of macrocyclic esters
    Publication number: 20020095045
    Abstract: Macrocyclic ester compounds can be prepared from oligoesters by thermal cleavage in the presence of a thermostable benzene derivative.
    Type: Application
    Filed: August 21, 2001
    Publication date: July 18, 2002
    Inventors: Horst Surburg, Dirk Muller, Stephan Klein, Christine Mendoza-Frohn, Georg Ronge, Kai Verkerk