Patents by Inventor Rudolf Weigand

Rudolf Weigand 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 of separating .gamma.-butyrolactone from mixtures containing diethyl succinate
    Patent number: 5030328
    Abstract: A method of separating .gamma.-butyrolactone from a mixture containing ethanol, tetrahydrofuran, water, n-butanol, 1,4-butanediol, diethyl succinate and .gamma.-butyrolactone, by distillation in vacuum columns.
    Type: Grant
    Filed: November 5, 1990
    Date of Patent: July 9, 1991
    Assignee: BASF Aktiengesellschaft
    Inventors: Rolf Fischer, Peter Stops, Erwin Brunner, Rudolf Weigand