Patents by Inventor Joachim Zechlin

Joachim Zechlin 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).

  • Polyurethane prepolymers and polyurethane elastomers based on 1,4-naphthalene diisocyanate
    Publication number: 20020123594
    Abstract: Polyurethane prepolymers and polyurethane elastomers based on 1,4-naphthalene are described. Methods of preparing the polyurethane prepolymers and elastomers are also described. Molded articles capable of withstanding high mechanical stresses, prepared from the polyurethane prepolymers and/or polyurethane elastomers of the present invention, are further described.
    Type: Application
    Filed: November 30, 2001
    Publication date: September 5, 2002
    Inventors: Andreas Hoffmann, Joachim Zechlin, James-Michael Barnes, Hartmut Nefzger, Lothar Duda, Bodo Temme
  • Process for the production of 1,5-naphthalenediamine
    Publication number: 20020103401
    Abstract: The invention relates to a process for the production of 1,5-naphthalenediamine and to the intermediates 4-(2-nitrophenyl)butyronitrile, 5-nitro-3,4-dihydro-1(2H)-naphthyl-imine, 5-nitroso-1-naphthylamine, 5-nitro-1-naphthylamine, 4-(2-aminophenyl)-butyronitrile, 5-amino-3,4-dihydro-1(2H)-naphthalene imine, 4-(2-nitrophenyl)ethyl butyrate and 4-(2-nitrophenyl)butyramide obtainable during the process.
    Type: Application
    Filed: December 18, 2001
    Publication date: August 1, 2002
    Inventors: Michael Schelhaas, Katrin Joschek, Manfred Jautelat, Joachim Zechlin, Dietmar Wastian