Patents by Inventor Bernd Leibmann

Bernd Leibmann 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 manufacture of 5-acetoacetylamino-benzimidazolone
    Patent number: 4153798
    Abstract: When continuously reacting an aqueous solution of 5-aminobenzimidazolone-(2) or a salt thereof with diketene then 5-acetoacetylamino-benzimidazolone is obtained in a smooth and safe reaction without foaming. The product results in high space-time yield and excellent quality.
    Type: Grant
    Filed: March 22, 1977
    Date of Patent: May 8, 1979
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Hartmut Heise, Bernd Leibmann, Dieter Morler, Eberhard Ritter, Wilfried Sahm