Patents by Inventor Curtis Alan Johnson

Curtis Alan Johnson 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).

  • Patent number: 7537806
    Abstract: In accordance with an embodiment of the invention, a thermal barrier coating for inclusion in a thermal barrier coating system is provided. The thermal barrier coating comprises a compound having a rhombohedral phase. In accordance with another embodiment of the invention, a thermal barrier coating is provided that comprises a compound having the formula of: A4B3O12, wherein A is at least one rare earth element; and B is selected from the group consisting of Zr, Hf and mixtures thereof.
    Type: Grant
    Filed: September 5, 2007
    Date of Patent: May 26, 2009
    Assignee: General Electric Company
    Inventors: Brett Allen Rohrer Boutwell, Ramgopal Darolia, Curtis Alan Johnson, Irene Spitsberg, Mark Daniel Gorman, Yan Gao
  • Publication number: 20090053050
    Abstract: A support apparatus for a gas turbine shroud is disclosed. The apparatus includes an outer shroud block having a coupling connectable to a casing of the gas turbine and a shroud component having a forward flange and an aft flange. The shroud component is attached to the outer shroud block via the forward flange and the aft flange. The apparatus further includes a damper disposed between the outer shroud block and the shroud component and a biasing element disposed within the outer shroud block. A translational degree of freedom between the damper and the outer shroud block defines a direction of motion of the damper. The biasing element is in operable connection between the outer shroud block and the shroud component via the damper, a bias force of the biasing element directed along the direction of motion of the damper.
    Type: Application
    Filed: August 23, 2007
    Publication date: February 26, 2009
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Kevin Leon Bruce, Ronald Ralph Cairo, Ronald Phillip Nimmer, Curtis Alan Johnson, Gregory Scot Corman, Herbert Chidsey Roberts, III
  • Patent number: 7476453
    Abstract: In accordance with an embodiment of the invention, a thermal barrier coating for inclusion in a thermal barrier coating system is provided. The thermal barrier coating comprises a compound having a rhombohedral phase. In accordance with another embodiment of the invention, a thermal barrier coating is provided that comprises a compound having the formula of: A4B3O12, wherein A is at least one rare earth element; and B is selected from the group consisting of Zr, Hf and mixtures thereof.
    Type: Grant
    Filed: December 6, 2004
    Date of Patent: January 13, 2009
    Assignee: General Electric Company
    Inventors: Brett Allen Rohrer Boutwell, Ramgopal Darolia, Curtis Alan Johnson, Irene Spitsberg, Mark Daniel Gorman, Yan Gao
  • Publication number: 20090004427
    Abstract: An article for use in aggressive environments is presented. In one embodiment, the article comprises a substrate and a self-sealing and substantially hermetic sealing layer disposed over the bondcoat. The substrate may be any high-temperature material, including, for instance, silicon-bearing ceramics and ceramic matrix composites. A method for making such articles is also presented. The method comprises providing a substrate; disposing a self-sealing layer over the substrate; and heating the sealing layer to a sealing temperature at which at least a portion of the sealing layer will flow.
    Type: Application
    Filed: June 26, 2007
    Publication date: January 1, 2009
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Reza Sarrafi-Nour, Krishan Lal Luthra, Peter Joel Meschter, Curtis Alan Johnson
  • Publication number: 20080305264
    Abstract: A thermal barrier coating and deposition process for a component intended for use in a hostile thermal environment, such as the turbine, combustor and augmentor components of a gas turbine engine. The TBC has a first coating portion on at least a first surface portion of the component. The first coating portion is formed of a ceramic material to have at least an inner region, at least an outer region overlying the inner region, and a columnar microstructure whereby the inner and outer regions comprise columns of the ceramic material. The columns of the inner region are more closely spaced than the columns of the outer region so that the inner region of the first coating portion is denser than the outer region of the first coating portion, wherein the higher density of the inner region promotes the impact resistance of the first coating portion.
    Type: Application
    Filed: July 31, 2008
    Publication date: December 11, 2008
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Irene Spitsberg, Brett Allen Rohrer Boutwell, Robert William Bruce, Curtis Alan Johnson, Bangalore Aswatha Nagaraj, William Scott Walston, Rudolfo Viguie, Joshua Leigh Miller, Roger D. Wustman
  • Publication number: 20080236869
    Abstract: Method for joining wires using low resistivity joints is provided. More specifically, methods of joining one or more wires having superconductive filaments, such as magnesium diboride filaments, are provided. The wires are joined by a low resistivity joint to form wires of a desired length for applications, such in medical imaging applications.
    Type: Application
    Filed: March 30, 2007
    Publication date: October 2, 2008
    Inventors: Judson Sloan Marte, Xianrui Huang, Evangelos Trifon Laskaris, Bruce Alan Knudsen, Thomas Robert Raber, Robert John Zabala, James William Bray, Paul Shadforth Thompson, Sergio Paulo Martins Loureiro, Curtis Alan Johnson, Sylvia Marie Decarr
  • Publication number: 20080166499
    Abstract: In accordance with an embodiment of the invention, a thermal barrier coating for inclusion in a thermal barrier coating system is provided. The thermal barrier coating comprises a compound having a rhombohedral phase. In accordance with another embodiment of the invention, a thermal barrier coating is provided that comprises a compound having the formula of: A4B3O12, wherein A is at least one rare earth element; and B is selected from the group consisting of Zr, Hf and mixtures thereof.
    Type: Application
    Filed: September 5, 2007
    Publication date: July 10, 2008
    Inventors: Brett Allen Rohrer Boutwell, Ramgopal Darolia, Curtis Alan Johnson, Irene Spitsberg, Mark Daniel Gorman, Yan Gao
  • Publication number: 20080160201
    Abstract: In accordance with an embodiment of the invention, an article is provided. The article comprises a substrate comprised of silicon containing material, an environmental barrier coating (EBC) overlying the substrate and a thermal barrier coating (TBC) on the environmental barrier coating. The thermal barrier coating comprising a compound having a rhombohedral phase.
    Type: Application
    Filed: September 5, 2007
    Publication date: July 3, 2008
    Inventors: Brett Allen Rohrer Boutwell, Irene Spitsberg, Christine Govern, Bangalore A. Nagaraj, Brian Thomas Hazel, Ramgopal Darolia, Curtis Alan Johnson, Yan Gao, Mark Daniel Gorman
  • Patent number: 7364807
    Abstract: In accordance with an embodiment of the invention, an article is provided. The article comprises a substrate comprised of silicon containing material, an environmental barrier coating (EBC) overlying the substrate and a thermal barrier coating (TBC) on the environmental barrier coating. The thermal barrier coating comprising a compound having a rhombohedral phase.
    Type: Grant
    Filed: December 6, 2004
    Date of Patent: April 29, 2008
    Assignee: General Electric Company
    Inventors: Brett Allen Rohrer Boutwell, Irene Spitsberg, Christine Govern, Bangalore A. Nagaraj, Brian Thomas Hazel, Ramgopal Darolia, Curtis Alan Johnson, Yan Gao, Mark Daniel Gorman
  • Publication number: 20080081109
    Abstract: Disclosed is a porous abradable coating including at least one abradable layer applicable to a substrate, said at least one abradable layer comprising coarsely cut powder pieces.
    Type: Application
    Filed: September 29, 2006
    Publication date: April 3, 2008
    Applicant: General Electric Company
    Inventors: Curtis Alan Johnson, Yuk-Chiu Lau, Joshua Lee Margolies, Herbert Chidsey Roberts
  • Patent number: 6998172
    Abstract: A thermal barrier coating (TBC 26) and method for forming the TBC (26) on a component (10) characterized by a stabilized microstructure that resists grain growth, sintering and pore coarsening or coalescence during high temperature excursions. The TBC (26) contains elemental carbon and/or a carbon-containing gas that increase the amount of porosity (32) initially within the TBC (26) and form additional fine closed porosity (32) within the TBC (26) during subsequent exposures to high temperatures. A first method involves incorporating elemental carbon precipitates by evaporation into the TBC microstructure. A second method is to directly incorporate an insoluble gas, such as a carbon-containing gas, into an as-deposited TBC (26) and then partially sinter the TBC (26) to entrap the gas and produce fine stable porosity within the TBC (26).
    Type: Grant
    Filed: August 16, 2002
    Date of Patent: February 14, 2006
    Assignee: General Electric Company
    Inventors: Boris A. Movchan, Yuriy E. Rudoy, Leonella M. Nerodenko, Ramgopal Darolia, Irene Spitsberg, Anthony Mark Thompson, Curtis Alan Johnson, David John Wortman
  • Patent number: 6982126
    Abstract: A thermal barrier coating (TBC) for a component intended for use in a hostile thermal environment. The TBC has an interior region and an outer surface region on and contacting the interior region. Both regions are formed of a ceramic material, with the interior region having a lower thermal conductivity than zirconia partially stabilized by about seven weight percent yttria. The interior region constitutes more than half of the thickness of the TBC, and the outer surface region constitutes less than half of the thickness of the TBC. The TBC has a columnar microstructure whereby the interior region and the outer surface region comprise columns of their ceramic materials. The outer surface region is more erosion and impact resistant than the interior region at least in part as a result of the columns thereof being more closely spaced than the columns of the interior region.
    Type: Grant
    Filed: November 26, 2003
    Date of Patent: January 3, 2006
    Assignee: General Electric Company
    Inventors: Ramgopal Darolia, Irene Spitsberg, Brett Allen Rohrer Boutwell, Mark Daniel Gorman, Curtis Alan Johnson, Venkat Subramaniam Venkataramani
  • Patent number: 6916429
    Abstract: A process for removing aluminosilicate-based material (e.g., “CMAS”) from a substrate is described. The material is treated with an aqueous composition containing at least one acid having the formula HxAF6, in which A is Si, Ge, Ti, Zr, Al, and Ga; and x is 1-6. Treatment of the substrate is often carried out by immersion in an aqueous bath. The process is also very effective for removing CMAS-type material from cavities in the substrate, e.g., cooling holes in a gas turbine component. Related compositions are also described.
    Type: Grant
    Filed: October 21, 2002
    Date of Patent: July 12, 2005
    Assignee: General Electric Company
    Inventors: Lawrence Bernard Kool, Stephen Joseph Ferrigno, Robert George Zimmerman, Jr., Mark Alan Rosenzweig, Curtis Alan Johnson
  • Patent number: 6844100
    Abstract: A fuel cell stack includes at least one fuel cell unit and a number of interconnects defining at least two openings and including at least one flow field for flowing a reagent. Each opening defines a respective fuel manifold, including at least one each of intake and exhaust fuel manifolds. The fuel cell unit includes an anode, a cathode, and an electrolyte disposed therebetween. The anode is adjacent to and in both electrical connection and fluid communication with one of the interconnects, which has a flow field that guides a fuel flow between the intake and exhaust fuel manifolds. The cathode is adjacent to and in both electrical connection and fluid communication with another interconnect with a flow field that guides an oxidant flow. The fuel cell stack includes a perimeter isolation seal and at least two interior isolation seals for sealing the electrolyte to the respective interconnects.
    Type: Grant
    Filed: August 27, 2002
    Date of Patent: January 18, 2005
    Assignee: General Electric Company
    Inventors: Richard Scott Bourgeois, Anthony Mark Thompson, Curtis Alan Johnson
  • Publication number: 20040180252
    Abstract: A fuel cell and a method for manufacturing a fuel cell are presented. The method comprises providing at least one substrate and disposing a plurality of fuel cell component layers on the substrate by at least one physical vapor deposition process. Each layer of the plurality comprises an edge bordering the layer. The fuel cell unit comprises at least one substrate; a plurality of fuel cell component layers disposed on the substrate, wherein each layer of the plurality comprises an edge bordering the layer; and at least one dense layer of material disposed over at least a portion of the edge of at least one fuel cell component layer. The at least one dense layer seals at least the aforementioned portion of the edge.
    Type: Application
    Filed: March 14, 2003
    Publication date: September 16, 2004
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: David John Wortman, Curtis Alan Johnson, Anthony Mark Thompson, Don Mark Lipkin
  • Publication number: 20040074873
    Abstract: A process for removing aluminosilicate-based material (e.g., “CMAS”) from a substrate is described. The material is treated with an aqueous composition containing at least one acid having the formula HXAF6, in which A is Si, Ge, Ti, Zr, Al, and Ga; and x is 1-6. Treatment of the substrate is often carried out by immersion in an aqueous bath. The process is also very effective for removing CMAS-type material from cavities in the substrate, e.g., cooling holes in a gas turbine component. Related compositions are also described.
    Type: Application
    Filed: October 21, 2002
    Publication date: April 22, 2004
    Applicant: General Electric Company
    Inventors: Lawrence Bernard Kool, Stephen Joseph Ferrigno, Robert George Zimmerman, Mark Alan Rosenzweig, Curtis Alan Johnson
  • Publication number: 20040043278
    Abstract: A fuel cell stack includes at least one fuel cell unit and a number of interconnects defining at least two openings and including at least one flow field for flowing a reagent. Each opening defines a respective fuel manifold, including at least one each of intake and exhaust fuel manifolds. The fuel cell unit includes an anode, a cathode, and an electrolyte disposed therebetween. The anode is adjacent to and in both electrical connection and fluid communication with one of the interconnects, which has a flow field that guides a fuel flow between the intake and exhaust fuel manifolds. The cathode is adjacent to and in both electrical connection and fluid communication with another interconnect with a flow field that guides an oxidant flow. The fuel cell stack includes a perimeter isolation seal and at least two interior isolation seals for sealing the electrolyte to the respective interconnects.
    Type: Application
    Filed: August 27, 2002
    Publication date: March 4, 2004
    Applicant: General Electric Company
    Inventors: Richard Scott Bourgeois, Anthony Mark Thompson, Curtis Alan Johnson
  • Publication number: 20030129378
    Abstract: A thermal barrier coating (TBC 26) and method for forming the TBC (26) on a component (10) characterized by a stabilized microstructure that resists grain growth, sintering and pore coarsening or coalescence during high temperature excursions. The TBC (26) contains elemental carbon and/or a carbon-containing gas that increase the amount of porosity (32) initially within the TBC (26) and form additional fine closed porosity (32) within the TBC (26) during subsequent exposures to high temperatures. A first method involves incorporating elemental carbon precipitates by evaporation into the TBC microstructure. A second method is to directly incorporate an insoluble gas, such as a carbon-containing gas, into an as-deposited TBC (26) and then partially sinter the TBC (26) to entrap the gas and produce fine stable porosity within the TBC (26).
    Type: Application
    Filed: August 16, 2002
    Publication date: July 10, 2003
    Applicant: General Electric Company
    Inventors: Boris A. Movchan, Yuriy E. Rudoy, Leonella M. Nerodenko, Ramgopal Darolia, Irene Spitsberg, Anthony Mark Thompson, Curtis Alan Johnson, David John Wortman
  • Patent number: 6503574
    Abstract: An article having a substrate is protected by a thermal barrier coating system. An interfacial layer contacts the upper surface of the substrate. The interfacial layer may comprise a bond coat only, or a bond coat and an overlay coat. The interfacial layer has on its upper surface a preselected, controllable pattern of three-dimensional features, such as grooves in a parallel array or in two angularly offset arrays. The features are formed by an ablation process using an ultraviolet laser such as an excimer laser. A ceramic thermal barrier coating is deposited over the pattern of features on the upper surface of the interfacial layer.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: January 7, 2003
    Assignee: General Electric Co.
    Inventors: David William Skelly, Bangalore Aswatha Nagaraj, David John Wortman, David Vincent Rigney, Seetha Ramaiah Mannava, Rudolfo Viguie, Robert William Bruce, Warren Arthur Nelson, Curtis Alan Johnson, Bhupendra Kumar Gupta
  • Patent number: 6444331
    Abstract: A roughened bond coat comprises a screen that includes interwoven wires defining openings and a metallic material disposed on the screen. The screen and metallic material form a roughened bond coat possessing an uneven, undulated, and irregular surface. The metallic material may be one of a slurry and a powder, and applied by coating and spraying, respectively. A thermal barrier coating system, which is formed with and incorporates the roughened bond coat, exhibits greater adhesion of a thermal barrier coating and bond coat due to an increased interfacial surface area provided by the uneven, undulated, and irregular surface.
    Type: Grant
    Filed: June 4, 2001
    Date of Patent: September 3, 2002
    Assignee: General Electric Company
    Inventors: Ann Melinda Ritter, Melvin Robert Jackson, Curtis Alan Johnson