Patents by Inventor Hermann Leipe

Hermann Leipe 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 preparation of dialkyl vinylphosphonates
    Patent number: 4894470
    Abstract: A process for the production of dialkyl esters of vinyl phosphonic acid which comprises subjecting dialkyl esters of 2-acetoxyethane phosphonic acid to cleavage by contacting with a liquid catalytically acting medium at a temperature in the range from 150.degree. to 270.degree. C. and under a pressure such that the partial pressures of the total of the components of the reaction system is in the range from 1 to 500 mbar, and drawing off the resulting dialkyl esters of vinyl phosphonic acid and other volatile reaction products.
    Type: Grant
    Filed: March 3, 1988
    Date of Patent: January 16, 1990
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gunter Roscher, Hans-Jerg Kleiner, Gabriele Ihl, Hermann Leipe