Patents by Inventor David Keith Steelman

David Keith Steelman 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).

  • Polyether polymerization process
    Patent number: 11820861
    Abstract: Catalyst complexes include a zinc hexacyanocobaltate with M5 metal and M6 metal or semi-metal phases, wherein M5 metal is gallium, hafnium, manganese, titanium and/or indium and the M6 metal or semi-metal is one or more of aluminum, magnesium, manganese, scandium, molybdenum, cobalt, tungsten, iron, vanadium, tin, titanium, silicon and zinc and is different from the M5 metal. The catalysts are highly efficient propylene oxide polymerization catalysts characterized by rapid activation, short times to the onset of rapid polymerization and high polymerization rates once rapid polymerization has begun.
    Type: Grant
    Filed: December 11, 2019
    Date of Patent: November 21, 2023
    Assignee: Dow Global Technologies LLC
    Inventors: David A. Babb, Jean-Paul Masy, David Keith Steelman
  • Polyether Polymerization Process
    Publication number: 20220041807
    Abstract: Catalyst complexes include a zinc hexacyanocobaltate with M5 metal and M6 metal or semi-metal phases, wherein M5 metal is gallium, hafnium, manganese, titanium and/or indium and the M6 metal or semi-metal is one or more of aluminum, magnesium, manganese, scandium, molybdenum, cobalt, tungsten, iron, vanadium, tin, titanium, silicon and zinc and is different from the M5 metal. The catalysts are highly efficient propylene oxide polymerization catalysts characterized by rapid activation, short times to the onset of rapid polymerization and high polymerization rates once rapid polymerization has begun.
    Type: Application
    Filed: December 11, 2019
    Publication date: February 10, 2022
    Inventors: David A. Babb, Jean-Paul Masy, David Keith Steelman