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).

  • Patent number: 4069251
    Abstract: In a continuous process 5-(.beta.-methylmercaptoethyl)-hydantoin is subjected to hydrolysis at an elevated temperature and elevated pressure in an aqueous solution of alkali carbonate or alkali bicarbonate or a mixture of these two compounds. The ammonia and carbon dioxide which form during the hydrolysis are removed and when the hydrolysis is complete the methionine is separated by means of carbon dioxide and the mother liquor is recirculated into the process after replenishing with fresh amounts of said hydantoin.
    Type: Grant
    Filed: August 12, 1976
    Date of Patent: January 17, 1978
    Assignee: Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
    Inventors: Sven Peter Mannsfeld, Arno Pfeiffer, Herbert Tanner, Hans Wagner, Erich Liebetanz, deceased
  • Patent number: 4020079
    Abstract: 3-Alkylthioalkyl-4-optionally substituted sydnones, useful as anti-inflammatory pharmaceutical agents, are prepared.
    Type: Grant
    Filed: August 1, 1974
    Date of Patent: April 26, 1977
    Assignee: G. D. Searle & Co.
    Inventors: Richard E. Ray, Hans A. Wagner
  • Patent number: 4011263
    Abstract: N-acetyl-L-methionine is prepared by reacting L-methionine with acetic anhydride in the presence of aqueous alkali at a temperature between 20.degree. and 60.degree. C. at a pH between 6.5 and 10. Preferably, there are used 1.05 to 1.70 moles of acetic anhydride per mole of L-methionine.
    Type: Grant
    Filed: May 11, 1976
    Date of Patent: March 8, 1977
    Assignee: Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
    Inventors: Hans Wagner, Alfred Maierhofer
  • Patent number: 4006031
    Abstract: Aqueous carbon black compositions are made containing fluorine containing wetting agents to increase the stability to weather. The carbon black compositions are useful in mineral binder systems, for example for concrete, slate, clear concrete, asbestos concrete and exterior plaster formulations.
    Type: Grant
    Filed: May 28, 1975
    Date of Patent: February 1, 1977
    Assignee: Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
    Inventors: Horst Ferch, Hans Wagner
  • 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
  • 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