Patents by Inventor Douglas W. KARKOW

Douglas W. KARKOW 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).

  • COMBUSTION SYSTEM WITH A PERFORATED FLAME HOLDER AND AN EXTERNAL FLUE GAS RECIRCULATION APPARATUS
    Publication number: 20170051913
    Abstract: A combustion system includes a perforated flame holder positioned within a combustion volume, a nozzle configured to emit a fuel stream toward the perforated flame holder, an oxidant source configured to introduce an oxidizer fluid into the combustion volume, and a flue gas recirculation (FGR) channel having a first end in fluid communication with the combustion volume downstream of the perforated flame holder and a second end in fluid communication with the oxidant source. A controller is configured to hold a combustion parameter within a selected range of values by regulating a quantity of flue gas flowing in the FGR channel.
    Type: Application
    Filed: July 6, 2016
    Publication date: February 23, 2017
    Inventors: JOSEPH COLANNINO, DOUGLAS W. KARKOW, CHRISTOPHER A. WIKLOF
  • DOWN-FIRED BURNER WITH A PERFORATED FLAME HOLDER
    Publication number: 20170038064
    Abstract: A down-fired flame burner includes a flame holder positioned below the burner. The flame holder includes a plurality of perforations that collectively confine a combustion reaction of the burner to the flame holder.
    Type: Application
    Filed: August 12, 2016
    Publication date: February 9, 2017
    Inventors: JOSEPH COLANNINO, DOUGLAS W. KARKOW, IGOR A. KRICHTAFOVITCH, CHRISTOPHER A. WIKLOF
  • BURNER SYSTEM INCLUDING A NON-PLANAR PERFORATED FLAME HOLDER
    Publication number: 20170038063
    Abstract: A combustion system such as a furnace or boiler includes a non-planar perforated flame holder configured to hold a combustion reaction.
    Type: Application
    Filed: August 15, 2016
    Publication date: February 9, 2017
    Inventors: JOSEPH COLANNINO, DOUGLAS W. KARKOW, JAMES K. DANSIE, CHRISTOPHER A. WIKLOF
  • Burner with a series of fuel gas ejectors and a perforated flame holder
    Patent number: 9562682
    Abstract: A combustion system outputs fuel gas from a plurality of fuel ejectors toward a forward end of a burner wall and preheats a perforated flame holder by sustaining combustion reaction of the fuel gas at combustion zone between the burner wall and a perforated flame holder. The combustion system then outputs fuel gas from the fuel ejectors onto the perforated flame holder and sustains a combustion reaction of the fuel gas within the perforated flame holder.
    Type: Grant
    Filed: June 16, 2015
    Date of Patent: February 7, 2017
    Assignee: CLEARSIGN COMBUSTION CORPORATION
    Inventors: Douglas W. Karkow, Robert Breidenthal, Joseph Colannino, Christopher A. Wiklof
  • LOW NOx FIRE TUBE BOILER
    Publication number: 20170010019
    Abstract: A fire tube boiler includes a perforated flame holder configured to hold a combustion reaction that produces very low oxides of nitrogen (NOx).
    Type: Application
    Filed: July 20, 2016
    Publication date: January 12, 2017
    Inventors: DOUGLAS W. KARKOW, JOSEPH COLANNINO, IGOR A. KRICHTAFOVITCH, ROBERT E. BREIDENTHAL, CHRISTOPHER A. WIKLOF
  • METHOD FOR OPERATING A COMBUSTION SYSTEM INCLUDING A PERFORATED FLAME HOLDER
    Publication number: 20160348899
    Abstract: A method for operating a combustion system includes outputting fuel and oxidant from a fuel and oxidant source onto a perforated flame holder. The method further includes sustaining a combustion reaction of the fuel and oxidant within the perforated flame holder.
    Type: Application
    Filed: August 12, 2016
    Publication date: December 1, 2016
    Inventors: DOUGLAS W. KARKOW, JOSEPH COLANNINO, CHRISTOPHER A. WIKLOF
  • ELECTRICALLY HEATED BURNER
    Publication number: 20160348901
    Abstract: A burner includes an electrically powered heater configured to output heat energy to a burner portion configured to contact a fuel stream or a combustion reaction supported by the fuel stream.
    Type: Application
    Filed: August 12, 2016
    Publication date: December 1, 2016
    Inventors: DOUGLAS W. KARKOW, JOSEPH COLANNINO, CHRISTOPHER A. WIKLOF
  • HIGH OUTPUT POROUS TILE BURNER
    Publication number: 20160348900
    Abstract: A method of operation of a burner system includes introducing a fuel stream into a perforated flame holder, combusting the fuel stream, with a majority of the combustion occurring between an input face and an output face of the flame holder, and producing a heat output from the combustion of at least 1.5 kBTU/H/in2.
    Type: Application
    Filed: August 12, 2016
    Publication date: December 1, 2016
    Inventors: JOSEPH COLANNINO, DOUGLAS W. KARKOW, CHRISTOPHER A. WIKLOF
  • FLAME VISUALIZATION CONTROL FOR A BURNER INCLUDING A PERFORATED FLAME HOLDER
    Publication number: 20160305660
    Abstract: A combustion system includes a perforated flame holder, a camera, and a control circuit. The perforated flame holder sustains a combustion reaction within the perforated flame holder. The image capture device takes a plurality of images of the combustion reaction. The control circuit produces from the images an averaged image and adjusts the combustion reaction based on the adjusted image.
    Type: Application
    Filed: April 19, 2016
    Publication date: October 20, 2016
    Inventors: JOSEPH COLANNINO, DOUGLAS W. KARKOW, ROBERT GEIGER, CHRISTOPHER A. WIKLOF
  • SYSTEM AND COMBUSTION REACTION HOLDER CONFIGURED TO TRANSFER HEAT FROM A COMBUSTION REACTION TO A FLUID
    Publication number: 20160304343
    Abstract: A combustion system includes a combustion reaction holder that defines plurality of combustion channels and a fluid volume separate from the plurality of combustion channels. The combustion channels are collectively configured to hold a combustion reaction. Heat from the combustion reaction is transferred to a fluid disposed in the fluid volume.
    Type: Application
    Filed: April 14, 2016
    Publication date: October 20, 2016
    Inventors: RICHARD F. RUTKOWSKI, JOSEPH COLANNINO, DOUGLAS W. KARKOW, ROBERT E. BREIDENTHAL, CHRISTOPHER A. WIKLOF
  • HORIZONTALLY FIRED BURNER WITH A PERFORATED FLAME HOLDER
    Publication number: 20160298840
    Abstract: A horizontally-fired flame burner includes a flame holder positioned laterally from the burner. The flame holder includes a plurality of perforations that collectively confine a combustion reaction of the burner to the flame holder.
    Type: Application
    Filed: April 6, 2016
    Publication date: October 13, 2016
    Inventors: DOUGLAS W. KARKOW, JOSEPH COLANNINO, IGOR A. KRICHTAFOVITCH, CHRISTOPHER A. WIKLOF
  • PRE-MIXED FUEL BURNER WITH PERFORATED FLAME HOLDER
    Publication number: 20160298838
    Abstract: A combustion system such as a furnace or boiler includes a perforated reaction holder configured to hold a combustion reaction that produces very low oxides of nitrogen (NOx).
    Type: Application
    Filed: April 6, 2016
    Publication date: October 13, 2016
    Inventors: DOUGLAS W. KARKOW, JOSEPH COLANNINO, ROBERT E. BREIDENTHAL, CHRISTOPHER A. WIKLOF
  • COMBUSTION SYSTEM WITH FLAME LOCATION ACTUATION
    Publication number: 20160290639
    Abstract: A combustion system includes an electrically actuated flame location control mechanism.
    Type: Application
    Filed: November 10, 2014
    Publication date: October 6, 2016
    Inventors: DOUGLAS W. KARKOW, JOSEPH COLANNINO, IGOR A. KRICHTAFOVITCH, ROBERT E. BREIDENTHAL, CHRISTOPHER A. WIKLOF
  • ELECTRICAL AND THERMAL INSULATION FOR A COMBUSTION SYSTEM
    Publication number: 20160290633
    Abstract: An electrically enhanced combustor includes bilayer insulation. A thermal insulator protects an electrical insulator from high temperatures that could cause the electrical insulator to become at least somewhat electrically conductive.
    Type: Application
    Filed: April 4, 2016
    Publication date: October 6, 2016
    Inventors: DAVID F. CHERPESKE, IGOR A. KRICHTAFOVITCH, DOUGLAS W. KARKOW, JOSEPH COLANNINO, JESSE DUMAS, CHRISTOPHER A. WIKLOF
  • Burner with a perforated reaction holder and heating apparatus
    Patent number: 9447965
    Abstract: A combustion system such as a furnace or boiler includes a perforated reaction holder configured to hold a combustion reaction that produces very low oxides of nitrogen (NOx).
    Type: Grant
    Filed: June 16, 2015
    Date of Patent: September 20, 2016
    Assignee: CLEARSIGN COMUBSTION CORPORATION
    Inventors: Douglas W. Karkow, Robert Breidenthal, Joseph Colannino, Christopher A. Wiklof
  • FLARE STACK WITH PERFORATED FLAME HOLDER
    Publication number: 20160245509
    Abstract: A flare stack burner includes a fuel stack housing in which a fuel nozzle and a perforated flame holder are positioned. The fuel nozzle is configured to emit a fuel stream toward the flame holder.
    Type: Application
    Filed: February 16, 2016
    Publication date: August 25, 2016
    Inventors: DOUGLAS W. KARKOW, JOSEPH COLANNINO, JERRY M. LANG, SR., CHRISTOPHER A. WIKLOF
  • BOX HEATER INCLUDING A PERFORATED FLAME HOLDER
    Publication number: 20160238277
    Abstract: An enclosed heater includes a plurality of tubes (or a continuous serpentine tube) and a perforated flame holder within an interior volume. The plurality of tubes carries a working fluid. The perforated flame holder supports a combustion reaction of fuel and oxidant within the perforated flame holder and radiates heat to the tubes to heat the working fluid.
    Type: Application
    Filed: February 16, 2016
    Publication date: August 18, 2016
    Inventors: JOSEPH COLANNINO, DOUGLAS W. KARKOW, ANDREW LEE, CHRISTOPHER A. WIKLOF
  • DUCT BURNER INCLUDING A PERFORATED FLAME HOLDER
    Publication number: 20160238240
    Abstract: A duct burner includes a perforated flame holder and a fuel header that is spaced away from the perforated flame holder and has a plurality of fuel nozzles. Each of the fuel nozzles is arranged to emit a fuel stream toward a respective portion of the perforated flame holder. A combustion reaction supported by the fuel streams is held within a plurality of apertures extending through the perforated flame holder.
    Type: Application
    Filed: February 16, 2016
    Publication date: August 18, 2016
    Inventors: JOSEPH COLANNINO, DOUGLAS W. KARKOW, CHRISTOPHER A. WIKLOF
  • BURNER WITH A PERFORATED FLAME HOLDER SUPPORT STRUCTURE
    Publication number: 20160238242
    Abstract: A combustion system includes a fuel and oxidant source, a perforated flame holder, and a support structure that supports the perforated flame holder at a selected distance from the fuel and oxidant source. The fuel and oxidant source outputs fuel and oxidant onto the perforated flame holder. The perforated flame holder receives the fuel and oxidant and sustains a combustion reaction of the fuel and oxidant within the perforated flame holder.
    Type: Application
    Filed: February 18, 2016
    Publication date: August 18, 2016
    Inventors: DOUGLAS W. KARKOW, JOSEPH COLANNINO, ROBERTO RUIZ, JESSE DUMAS, JAMES K. DANSIE, DONALD KENDRICK, NICHOLAS S. BROMER, CHRISTOPHER A. WIKLOF
  • TUNNEL BURNER INCLUDING A PERFORATED FLAME HOLDER
    Publication number: 20160238318
    Abstract: A process oven includes a housing structure with a conveyor system configured to carry product through a housing structure from a first opening to a second opening. A perforated flame holder is positioned within the housing structure and configured to apply, to the product, thermal energy released by a combustion reaction held by the perforated flame holder.
    Type: Application
    Filed: February 16, 2016
    Publication date: August 18, 2016
    Inventors: JOSEPH COLANNINO, DOUGLAS W. KARKOW, CHRISTOPHER A. WIKLOF