Patents by Inventor Werner Drewitz

Werner Drewitz 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).

  • Isolation of 1,3-butadiene
    Patent number: 4859286
    Abstract: 1,3-Butadiene is isolated from a C.sub.4 -hydrocarbon mixture containing 1,3-butadiene and small amount of propyne and C.sub.5 -hydrocarbons by extractive distillation with a selective solvent and subsequent distillative purification of the crude 1,3-butadiene obtained in the extractive distillation.
    Type: Grant
    Filed: March 18, 1988
    Date of Patent: August 22, 1989
    Assignee: BASF Aktiengesellschaft
    Inventors: Gerd Kaibel, Werner Hefner, Peter Keller, Werner Drewitz