Patents by Inventor Karl-Heinz Henke

Karl-Heinz Henke 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 continuous manufacture of crystallized ammonium thiosulfate
    Patent number: 3937793
    Abstract: Crystallized ammonium thiosulfate is manufactured by converting ammonia with oxygen containing sulfur dioxide in ammonium thiosulfate solution to ammonium bisulfite and ammonium sulfite in a first step, while maintaining a pH of from 5.5 to 7.0 and a reaction temperature of up to 80.degree.C. In a second step, the ammonium bisulfite and ammonium sulfite in the solution are converted with ammonia and sulfur to ammonium thiosulfate.
    Type: Grant
    Filed: June 18, 1973
    Date of Patent: February 10, 1976
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Adolf Metzger, Karl-Heinz Henke, Horst Schreiber