Patents by Inventor Simon Hans H. Niemann

Simon Hans H. Niemann 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 to prepare 5-formylvaleric acid
    Patent number: 6268530
    Abstract: Process to separate linear 5-formylvaleric acid from a mixture of 5- and 3- and 4-formylvaleric acids, wherein the separation is performed by fractional extraction with two immiscible solvents of which one solvent is an aqueous solvent and the other solvent is an organic solvent, in which the organic solvent has a higher or lower affinity for 5-formylvaleric acid than its affinity for the 3-formylvaleric acids and for the 4-formylvaleric acid. Furthermore the invention relates to an improved process to prepare ∈-caprolactam starting from a mixture of branched and linear formylvaleric acids or starting from pentenoic acid.
    Type: Grant
    Filed: January 5, 1998
    Date of Patent: July 31, 2001
    Assignees: DSM N.V., E. I. DuPont de Nemours and Company
    Inventors: Imre Toth, Onko Gelling, Rudolf P. M. Guit, Antonius J. F. Simons, Simon Hans H. Niemann