Patents by Inventor Winfried Reimann

Winfried Reimann 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).

  • Method for producing polylactic acid and corresponding device
    Patent number: 6875839
    Abstract: The invention relates to a method for producing polylactic acid, comprising the steps of obtaining lactic acid from starchy agricultural products by fermentation, ultrapurification of the lactic acid by ultrafiltration, nanofiltration and/or electrodialysis, concentration of the lactic acid and production of a prepolymer, cyclizing depolymerization to dilactide, purification of the dilactide, ring-opening polymerization of the dilactide and demonomerization of the polylactide.
    Type: Grant
    Filed: April 19, 2001
    Date of Patent: April 5, 2005
    Assignee: Inventa-Fischer GmbH & Co. KG
    Inventors: Lüder Gerking, Rainer Hagen, Klaus Richter, Frank Idler, Winfried Reimann, Bernd Hanzsch
  • Method for producing polylactic acid and corresponding device
    Publication number: 20030158360
    Abstract: The invention relates to a method for producing polylactic acid, comprising the steps of obtaining lactic acid from starchy agricultural products by fermentation, ultrapurification of the lactic acid by ultrafiltration, nanofiltration and/or electrodialysis, concentration of the lactic acid and production of a prepolymer, cyclizing depolymerization to dilactide, purification of the dilactide, ring-opening polymerization of the dilactide and demonomerization of the polylactide.
    Type: Application
    Filed: January 30, 2003
    Publication date: August 21, 2003
    Inventors: L?uuml;der Gerking, Rainer Hagen, Klaus Richter, Frank Idler, Winfried Reimann, Bernd Hanzsch