Patents by Inventor Rüdiger Drope

Rüdiger Drope 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).

  • Process for the isomeric separation of isocyanates
    Patent number: 6271414
    Abstract: A process is described for obtaining pure isocyanate isomers from a mixture of isocyanate isomers by suspension crystallization and the isolation of isomerically pure crystals, which is characterized in that, prior to the isolation of the crystals, 5 to 40% by weight of the crystals produced are remelted while simultaneously increasing the temperature of the crystal slurry by 4.5 to 9° C.
    Type: Grant
    Filed: April 29, 1999
    Date of Patent: August 7, 2001
    Assignee: Bayer Aktiengesellschaft
    Inventors: Rüdiger Drope, Dieter Grenner, Hartmut Hetzel, Hans-Peter Schal, Gerhard Wegener