Patents by Inventor Lothar Kisielowski

Lothar Kisielowski 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).

  • Patent number: 4697035
    Abstract: A simplified process for the preparation of basically substituted phenylacetonitriles, in particular of verapamil, is described. This process is carried out with fewer stages and higher yields than the known processes according to the state of the art.
    Type: Grant
    Filed: June 3, 1985
    Date of Patent: September 29, 1987
    Assignee: Ludwig Heumann & Co., GmbH
    Inventors: Lothar Kisielowski, Ingomar Grafe, Walter Liebenow, Kurt H. Ahrens