Patents by Inventor Donald K. MacQueen

Donald K. MacQueen 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).

  • Fractionation column for reclaiming used lubricating oil
    Patent number: 4406743
    Abstract: A novel process for the purification of used oil comprising removing the ash-forming components, then subjecting the oil to vacuum fractionation. A novel vacuum fractionation column is also disclosed.
    Type: Grant
    Filed: September 24, 1982
    Date of Patent: September 27, 1983
    Assignee: Phillips Petroleum Company
    Inventors: Donald K. MacQueen, William E. Wood
  • Reclaiming used lubricating oil
    Patent number: 4381992
    Abstract: A novel process for the purification of used oil comprising removing the ash-forming components, then subjecting the oil to vacuum fractionation. A novel vacuum fractionation column is also disclosed.
    Type: Grant
    Filed: June 15, 1981
    Date of Patent: May 3, 1983
    Assignee: Phillips Petroleum Company
    Inventors: William E. Wood, Donald K. MacQueen