Patents by Inventor Hans Jörg Wilfinger

Hans Jörg Wilfinger 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 continuous producing hydroxylammonium salts
    Patent number: 7037478
    Abstract: A process for the continuous preparation of hydroxylammonium salts by catalytic reduction of nitrogen monoxide by means of hydrogen in a dilute aqueous solution of mineral acid in a plurality of reaction stages connected in series comprises dividing the incoming stream of dilute aqueous solution of mineral acid into at least two substreams before it is fed into the plurality of reaction stages connected in series, feeding a first of these substreams to the first reaction stage, feeding a second of these substreams to a reaction stage other than the first, where the inflow of dilute aqueous solution of mineral acid into the plurality of reaction stages connected in series is controlled by means of the pH in this reaction stage other than the first.
    Type: Grant
    Filed: December 12, 2001
    Date of Patent: May 2, 2006
    Assignee: BASF Aktiengesellschaft
    Inventors: Michael Bender, Hans Jörg Wilfinger, Albert Schenkel
  • Method for preparing highly stabilized hydroxylamine solutions
    Patent number: 6534681
    Abstract: The present invention relates to a process for the preparation of high-purity, stabilized hydroxylamine solutions in which an aqueous hydroxylamine starting solution is treated with an anion exchanger which has been pre-loaded with a hydroxylamine stabilizer in order to remove anions.
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: March 18, 2003
    Assignee: BASF Aktiengesellschaft
    Inventors: Otto Watzenberger, Hans Jörg Wilfinger