Patents by Inventor Rene Leuthold

Rene Leuthold 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 the continuous production of isocyanates
    Patent number: 7851648
    Abstract: The invention relates to a process for preparing polyisocyanates by reacting organic amines with phosgene, wherein the reaction is carried out in at least three stages, with the first stage being carried out in a mixing apparatus, the second stage in at least one residence apparatus and the third stage in at least one separation apparatus and the pressure in each successive stage being lower than that in the previous stage.
    Type: Grant
    Filed: December 13, 2003
    Date of Patent: December 14, 2010
    Assignee: BASF Aktiengesellschaft
    Inventors: Martin Sohn, Eckhard Stroefer, Filip Nevejans, Ulrich Penzel, Hans-Juergen Pallasch, Rene Leuthold, Andreas Brodhagen, Andreas Woelfert, Wolfgang Mackenroth, Markus Maurer
  • Method for the continuous production of isocyanates
    Publication number: 20060252960
    Abstract: The invention relates to a process for preparing polyisocyanates by reacting organic amines with phosgene, wherein the reaction is carried out in at least three stages, with the first stage being carried out in a mixing apparatus, the second stage in at least one residence apparatus and the third stage in at least one separation apparatus and the pressure in each successive stage being lower than that in the previous stage.
    Type: Application
    Filed: December 13, 2003
    Publication date: November 9, 2006
    Applicant: BASF AKTIENGESELLSCHAFT
    Inventors: Martin Sohn, Eckhard Stroefer, Filip Nevejans, Ulrich Penzel, Has-Juergen Pallasch, Rene Leuthold, Andreas Brodhagen, Andreas Woelfert, Wolfgang Mackenroth, Markus Maurer
  • Work-up of distillation residues from the synthesis of toluene diisocyanate
    Patent number: 6673960
    Abstract: A process for working up distillation residues from the synthesis of tolylene diisocyanate by reaction of the distillation residues with water comprises reacting the TDI distillation residues with water in a continuous or semicontinuous process in a backmixed reactor in the presence of hydrolysate.
    Type: Grant
    Filed: December 14, 2000
    Date of Patent: January 6, 2004
    Assignee: BASF Aktiengesellschaft
    Inventors: Hans Volkmar Schwarz, Markus Maurer, Michael Sander, Eckhard Ströfer, Rene Leuthold, Burghard Hantel, Siegfried Richter, Jörg Therre