Patents Represented by Law Firm McDonnell Boehnen et al.
  • Tridentate metal ligands of certain pyridine phosphonic acids
    Patent number: 5686613
    Abstract: Novel pyridine phosphonate ligands are disclosed that when combined with polyvalent metals results in useful catalyst compositions for the conversion of hydrogen sulfide to solid sulfur. Catalysts containing these novel ligands exhibit resistance to metal precipitation and demonstrate little or no oxidative chemical degradation when employed to convert hydrogen sulfide to elemental sulfur.
    Type: Grant
    Filed: January 16, 1996
    Date of Patent: November 11, 1997
    Assignee: Wheelabrator Clean Air Systems Inc.
    Inventors: Derek McManus, Arthur E. Martell, Dian Chen