Patents by Inventor Sandra Otto

Sandra Otto 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).

  • Combination of pyrrolidone based solvents for the production of porous membranes
    Patent number: 12226738
    Abstract: The present invention relates to a method for producing a porous membrane, the method being characterized in that a solvent system comprising 2-pyrrolidone and N-alkyl-2-pyrrolidone is used, wherein the content ratio of 2-pyrrolidone to N-alkyl-2-pyrrolidone in the solvent system is from 90%:10% to 10%:90%, based on mass %, and wherein N-alkyl-2-pyrrolidone is N-propyl-2-pyrrolidone and/or N-butyl-2-pyrrolidone. Furthermore, the present invention relates to a porous membrane obtainable by said method. Moreover, the present invention relates to the use of a specific solvent system for the production of a porous membrane.
    Type: Grant
    Filed: June 25, 2020
    Date of Patent: February 18, 2025
    Assignee: Sartorius Stedim Biotech GMBH
    Inventors: Jan Schwellenbach, Catharina Warnke, Sandra Otto
  • COMBINATION OF PYRROLIDONE BASED SOLVENTS FOR THE PRODUCTION OF POROUS MEMBRANES
    Publication number: 20220203306
    Abstract: The present invention relates to a method for producing a porous membrane, the method being characterized in that a solvent system comprising 2-pyrrolidone and N-alkyl-2-pyrrolidone is used, wherein the content ratio of 2-pyrrolidone to N-alkyl-2-pyrrolidone in the solvent system is from 90%:10% to 10%:90%, based on mass %, and wherein N-alkyl-2-pyrrolidone is N-propyl-2-pyrrolidone and/or N-butyl-2-pyrrolidone. Furthermore, the present invention relates to a porous membrane obtainable by said method. Moreover, the present invention relates to the use of a specific solvent system for the production of a porous membrane.
    Type: Application
    Filed: June 25, 2020
    Publication date: June 30, 2022
    Applicant: Sartorius Stedim Biotech GmbH
    Inventors: Jan Schwellenbach, Catharina Warnke, Sandra Otto