Patents by Inventor Torsten Groth

Torsten Groth 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 polysuccinimide
    Patent number: 5493004
    Abstract: The invention relates to an improved process for the preparation of polysuccinimide from maleic anhydride and ammonia, characterized in that the starting compounds are brought to reaction in liquid form in a tubular reactor with feed nozzle at temperatures of preferably 50.degree. C. to 500.degree. C. and residence times of preferably 0.1 to 600 seconds and the resulting reaction mixture is possibly further polymerized thermally in a high-viscosity reactor preferably continuously operated at 120.degree. C. to 300.degree. C.
    Type: Grant
    Filed: April 8, 1994
    Date of Patent: February 20, 1996
    Assignee: Bayer AG
    Inventors: Torsten Groth, Winfried Joentgen, Dorde Jovcic, Paul Wagner, Hans-Joachim Traenckner
  • Process for the preparation of polysuccinimide and polyaspartic acid
    Patent number: 5371180
    Abstract: Polysuccinimide is prepared by reaction of fumaric acid, maleic acid or a derivative thereof with urea, isourea, carbamic acid, ammonium carbamide, ammonium bicarbonate, diammonium carbonate or mixtures of the abovementioned substances in a reactor at temperatures of preferably 100.degree. C. to 300.degree. C. over reaction times of preferably 0.5 minute to 300 minutes.
    Type: Grant
    Filed: March 31, 1994
    Date of Patent: December 6, 1994
    Assignee: Bayer AG
    Inventors: Torsten Groth, Winfried Joentgen, Gunter Boehmke, Gerd Schmitz, Hans-Joachim Traenckner