Patents by Inventor Hans Wagner

Hans Wagner 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 3,6-bis-(2-methylmercaptoethyl)-2,5-piperazinedione
    Patent number: 3980653
    Abstract: 3,6-BIS-(2-METHYLMERCAPTOETHYL)-2,5-PIPERAZINEDIONE IS PREPARED FROM 5-(2-METHYLMERCAPTOETHYL)-HYDANTOIN IN THE PRESENCE OF WATER AT 100.degree. TO 200.degree.C. at elevated pressure.
    Type: Grant
    Filed: June 26, 1975
    Date of Patent: September 14, 1976
    Assignee: Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
    Inventors: Hans Wagner, Alfred Maierhofer
  • Process for the stabilization of methionine
    Patent number: 3931307
    Abstract: Methionine is stabilized by adjusting the pH to the range from 3 to <5. The source of the hydantoin is preferably 5-(beta-methylmercaptoethyl)-hydantoin.
    Type: Grant
    Filed: November 30, 1973
    Date of Patent: January 6, 1976
    Assignee: Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
    Inventors: Gerd Eikelmann, Rudolf Fahnenstich, Theodor Lussling, Sven-Peter Mannsfeld, Gerhard Pohl, Herbert Tanner, Hans Wagner