Patents by Inventor Regina Schitter

Regina Schitter 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).

  • Washing process for the purification of polymers containing N or amino, ammonium or spirobicyclic ammonium groups
    Patent number: 6806350
    Abstract: The invention relates to a washing process for cleaning polymers containing N or amine, ammonium or spirobicyclic ammonium groups, comprising cationic groups containing N, in addition to suitable counterions, whereby the gelled-out polymers are obtained through polymerization and cross-linking by a) adding a base which is partially or fully deprotonated, b) the partially or fully deprotonated polymers are washed, then c) optionally, are reprotonated in an organic solvent or in an organic solvent/water mixture by adding an acid, whereupon d) optionally, they are washed in an organic solvent or an organic solvent/water mixture in order to shrink the gels and optionally, e) in connection with step c) or d), the steps a)-c) or -d) are repeated.
    Type: Grant
    Filed: February 24, 2003
    Date of Patent: October 19, 2004
    Assignee: DSM Fine Chemicals Austria Nfg GmbH & Co KG
    Inventors: Michael Stanek, Regina Schitter, Gerhard Steinbauer, Gerald Summer, Peter Hildebrand
  • Washing process for the purification of polymers contanining in or armino, ammonium or spirobicyclic ammonium groups
    Publication number: 20040006201
    Abstract: The invention relates to a washing process for cleaning polymers containing N or amine, ammonium or spirobicyclic ammonium groups, comprising cationic groups containing N, in addition to suitable counterions, whereby the gelled-out polymers are obtained through polymerisation and cross-linking by a) adding a base which is partially or fully deprotonated, b) the partially or fully deprotonated polymers are washed, then c) optionally, are reprotonated in an organic solvent or in an organic solvent/water mixture by adding an acid, whereupon d) optionally, they are washed in an organic solvent or an organic solvent/water mixture in order to shrink the gels and optionally, e) in connection with step c) or d), the steps a)-c) or -d) are repeated.
    Type: Application
    Filed: February 24, 2003
    Publication date: January 8, 2004
    Inventors: Michael Stanek, Regina Schitter, Gerhard Steinbauer, Gerald Summer, Peter Hildebrand
  • Functionalized and polymerizable polymer
    Patent number: 6479592
    Abstract: A functionalized and polymerizable polymer is described which is obtainable by ring-opening metathesis polymerization and is suitable in particular as a dental material and especially as a constituent of dental adhesives owing to an adhesion-boosting effect.
    Type: Grant
    Filed: August 20, 1999
    Date of Patent: November 12, 2002
    Assignee: Ivoclar Vivadent AG
    Inventors: Volker Rheinberger, Norbert Moszner, Franz Stelzer, Regina Schitter, Frank Zeuner
  • FUNCTIONALIZED AND POLYMERIZABLE POLYMER
    Publication number: 20020143118
    Abstract: A functionalized and polymerizable polymer is described which is obtainable by ring-opening metathesis polymerization and is suitable in particular as a dental material and especially as a constituent of dental adhesives owing to an adhesion-boosting effect.
    Type: Application
    Filed: August 20, 1999
    Publication date: October 3, 2002
    Inventors: VOLKER RHEINBERGER, NORBERT MOSZNER, FRANZ STELZER, REGINA SCHITTER, FRANK ZEUNER