Patents by Inventor Rolf Losch

Rolf Losch 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).

  • Production of pyridine-3-sulfonic acid
    Patent number: 5082944
    Abstract: A method for the production of heavy metal-free pyridine -3-sulfonic acid by oxidation of 3-chloro-pyridine to 3-chloro-pyridine-N-oxide, substitution of the chlorine through a sulfonic acid group, and subsequent reduction to pyridine-3-sulfonic acid. The method can be carried out using raw 3-chloropyridine-N-oxide and direct further reaction of the pyridine-3-sulfonic acid-N-oxide in the presence of Raney nickel in an alkaline solution.
    Type: Grant
    Filed: October 31, 1990
    Date of Patent: January 21, 1992
    Assignee: Rutgerswerke AG
    Inventors: Rolf Losch, Winfried Orth, Wolfgang Weiss, Hans W. Kleffner