Patents by Inventor Adolf Metzger

Adolf Metzger 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 ammonium sulfamate
    Patent number: 4393033
    Abstract: Ammonium sulfamate is prepared continuously, starting from ammonia and sulfur trioxide, by introducing liquid sulfur trioxide and liquid ammonia in a molar ratio NH.sub.3 /SO.sub.3 greater than 2.0:1 into a pressure reactor containing molten reaction product. Excess ammonia is removed continuously from the reactor. The liquid sulfur trioxide is introduced into the melt, while the liquid ammonia is fed onto the surface of the melt.
    Type: Grant
    Filed: December 18, 1981
    Date of Patent: July 12, 1983
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Adolf Metzger, Rolf Konrad, Reinhold Graser
  • Process for the preparation of amidosulfonic acid
    Patent number: 4107279
    Abstract: When sulfur trioxide is reacted with ammonia, a melted reaction product containing mainly the ammonium salts of amidosulfonic acid and imido-disulfonic acid is obtained. According to the invention the melted reaction product is introduced into mineral acids. From the resulting solution, free amidosulfonic acid precipitates in high yield.
    Type: Grant
    Filed: August 22, 1977
    Date of Patent: August 15, 1978
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Reinhold Graser, Heinz Karl Hofmeister, Adolf Metzger
  • 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