Patents by Inventor Bernd Lehamnn

Bernd Lehamnn 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 production of 4-amino-6-tert. butyl-3-mercapto-1,2,4-triazin-5-one
    Patent number: 4326056
    Abstract: 4-amino-6-tert.butyl-3-mercapto-1,2,4-triazin-5-one of the formula ##STR1## is produced by reacting pivaloyl cyanide and isobutylene in the presence of acetic acid and sulfuric acid, hydrolyzing the reaction mixture in the presence of water and reacting the trimethyl pyruvic acid formed with thiocarbohydrazide. The triazinone is an important intermediate product in the synthesis of the known herbicide 4-amino-6-tert.butyl-3-methylmercapto-1,2,4-triazin-5-one.
    Type: Grant
    Filed: May 22, 1981
    Date of Patent: April 20, 1982
    Assignee: Degussa Aktiengesellschaft
    Inventors: Axel Kleemann, Bernd Lehamnn, Herbert Klenk