Patents by Inventor David W. McDougall

David W. McDougall 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).

  • Apparatus for recovering elemental sulphur
    Patent number: 5047216
    Abstract: A piping arrangement for two or three Claus catalytic converters and condenser sets used for recovering sulphur from gas streams containing hydrogen sulphide. One of the converters is operated at a sub-dewpoint temperature while the other(s) is(are) operated at a higher temperature for regenerating the catalyst. The piping arrangement includes two four-way switching valves that allow an influent gas stream to be switched between the two converters without leaving stagnant gas in the piping.
    Type: Grant
    Filed: February 22, 1988
    Date of Patent: September 10, 1991
    Assignee: Delta Projects Inc.
    Inventor: David W. McDougall
  • Diluent substitution apparatus
    Patent number: 4994149
    Abstract: In a process for the treatment of heavy oil, in which a hydrocarbon diluent is added to the heavy oil stream, part of the diluent is substituted by an LPG liquid stream. The LPG stream is added to the heavy oil stream after removal of light components including methane and carbon dioxide to reduce the vapor pressure of the stream, producing a sales oil stream.
    Type: Grant
    Filed: November 3, 1989
    Date of Patent: February 19, 1991
    Assignee: Delta Projects Inc.
    Inventors: Jeffery E. Scott, David W. McDougall, Ronald G. Holcek
  • Diluent substitution process
    Patent number: 4882041
    Abstract: In a process for the treatment of heavy oil, in which a hydrocarbon diluent is added to the heavy oil stream, part of the diluent is substituted by an LPG liquid stream. The LPG stream is added to the heavy oil stream after removal of light components including methane and carbon dioxide to reduce the vapor pressure of the stream, producing a sales oil stream.
    Type: Grant
    Filed: June 9, 1987
    Date of Patent: November 21, 1989
    Assignee: Delta Projects Inc.
    Inventors: Jeffery E. Scott, David W. McDougall, Ronald G. Holcek
  • Diluent distillation process and apparatus
    Patent number: 4661242
    Abstract: An improvement in a process for the treatment of heavy oil in which a hydrocarbon diluent is subjected to distillation prior to its addition to a heavy oil production stream, to remove at least some of the light components in the diluent that would otherwise vaporize in the treatment process. A distillation unit for use in the process is also disclosed.
    Type: Grant
    Filed: June 12, 1985
    Date of Patent: April 28, 1987
    Assignee: Delta Projects Inc.
    Inventors: Jeffery E. Scott, David W. McDougall, Robert E. Heigold