Patents by Inventor Gisbert Franzke

Gisbert Franzke 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 producing isocyanates
    Patent number: 7179935
    Abstract: A process for the preparation of isocyanates from carbamic esters.
    Type: Grant
    Filed: February 28, 2003
    Date of Patent: February 20, 2007
    Assignee: BASF Aktiengesellschaft
    Inventors: Eckhard Stroefer, Michael Ochse, Volker Krase, Andreas Schmidt, Matthias Kloetzer, Imbridt Murrar, Gisbert Franzke
  • Method for producing isocyanates
    Publication number: 20050154227
    Abstract: In a process for the preparation of isocyanates from carbamic esters, (i) a mixture containing a monofunctional or polyfunctional carbamic ester is passed continuously into a cleavage reactor or a cascade of two or more cleavage reactors, (ii) the carbamic ester is subjected to a thermal cleavage to give isocyanate and alcohol, (iii) the cleavage gas escaping from the cleavage reactor or reactors and containing the isocyanate, the alcohol, any uncleaved and/or partly cleaved carbamic ester and byproducts is brought into contact with a liquid coolant and condensing agent, cooled and at least partly condensed and (iv) the isocyanate and the alcohol are obtained from the cooled cleavage gas and the condensate in a rectification column, a part-stream of the alcohol obtained being used as liquid coolant and condensing agent for cooling and condensing the cleavage gas.
    Type: Application
    Filed: February 28, 2003
    Publication date: July 14, 2005
    Applicant: BASF AKTIENGESELLSCHAFT
    Inventors: Eckhard Stroefer, mIchael Ochse, Volker Krase, Andreas Schmidt, Matthias Klotzer, Imbridt Murrar, Gisbert Franzke