Patents by Inventor Yvonne M. Liske

Yvonne M. Liske 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).

  • Reductive combustion of ammonium salts of sulfuric acid
    Patent number: 6342651
    Abstract: A process is provided for the combustion of ammonium salts of sulfuric acid contained in aqueous media. More particularly, a reductive combustion process which produces a combustion gas containing a divalent sulfur compound having a high concentration of hydrogen sulfide. The process is suitable for combusting ammonium salts of sulfuric acid produced during manufacture of 2-hydroxy-4-methylthiobutanoic acid (HMBA) or methionine. The divalent sulfur compounds in the combustion gas may be further converted to other useful sulfur products and recycled for use in the manufacture of HMBA or methionine.
    Type: Grant
    Filed: August 4, 2000
    Date of Patent: January 29, 2002
    Assignee: Novus International, Inc.
    Inventors: Stephen J. Lorbert, James M. Willock, Lewis B. Irvine, Shubhender Kapila, Virgil J. Flanigan, Paul K. S. Nam, Yvonne M. Liske