Patents by Inventor Ernst Wressnegger

Ernst Wressnegger 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).

  • Preparation of alkylated N- or amino, ammonium or spirobicyclic ammonium group-containing, crosslinked polymers
    Patent number: 7105631
    Abstract: Process for the preparation of alkylated N- or amino, ammonium or spirobicyclic ammonium group-containing, crosslinked polymer gels, which is characterized in that a) in the crosslinkage step an aqueous solution of a polymer obtained by polymerization of the corresponding monomer is adjusted to a pH of 7.5–14 at a temperature of 0 to 90° C.
    Type: Grant
    Filed: September 2, 2003
    Date of Patent: September 12, 2006
    Assignee: DSM Fine Chemicals Austria NFG GmbH & CO KG
    Inventors: Michael Stanek, Marion Wagner, Gerhard Schoppel, Georg Haeubl, Ernst Wressnegger, Walter Raml
  • Preparation of alkylated N- or amino, ammonium or spirobicyclic ammonium group-containing, crosslinked polymers
    Publication number: 20040039086
    Abstract: Process for the preparation of alkylated N- or amino, ammonium or spirobicyclic ammonium group-containing, crosslinked polymer gels, which is characterized in that
    Type: Application
    Filed: September 2, 2003
    Publication date: February 26, 2004
    Inventors: Michael Stanek, Marion Wagner, Gerhard Schoppel, Georg Haeubl, Ernst Wressnegger, Walter Raml
  • Method for producing substituted pyridine-carboxylic acids
    Patent number: 6346623
    Abstract: An improved process for the preparation of substituted pyridinecarboxylic acids (II), useful as herbicide intermediates, by ozonolysis of quinolines (I).
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: February 12, 2002
    Assignee: DSM Fine Chemicals Austria Nfg GmbH & CoKG
    Inventors: Gerhard Steinbauer, Curt Zimmermann, Ernst Wressnegger, Erich Steinwender