Patents by Inventor Jobst Watzdorf

Jobst Watzdorf 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).

  • Distillative preparation of ipda having a high cis-trans isomer ratio
    Publication number: 20050252761
    Abstract: The invention relates to a process for recovering 3-aminomethyl-3,5,5-trimethylcyclohexylamine(isophoronediamine, IPDA) having a cis/trans isomer ratio of at least 73/27 by fractional distillation, which comprises the following steps: a) providing IPDA in a cis/trans isomer ratio of <73/27; b) feeding IPDA into the middle region of a distillation column having internals and distilling the IPDA in this distillation column at a temperature of from 5 to 300° C.
    Type: Application
    Filed: August 8, 2003
    Publication date: November 17, 2005
    Applicant: Basf Aktiengesellschaft
    Inventors: Frank Funke, Thomas Hill, Jobst Watzdorf, Wolfgang Mattmann, Wolfgang Harder, Erhard Henkes, Gerd Littmann, Manfred Julius