Patents by Inventor Venkat Subramaniam Venkataramani
Venkat Subramaniam Venkataramani 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).
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Publication number: 20160168684Abstract: Articles having coatings that are resistant to high temperature degradation are described, along with methods for making such articles. The article comprises a coating disposed on a substrate. The coating comprises a plurality of elongated surface-connected voids. The article further includes a protective agent disposed within at least some of the voids of the coating; the protective agent comprises a substance capable of chemically reacting with liquid nominal CMAS to form a solid crystalline product outside the crystallization field of said nominal CMAS. This solid crystalline product has a melting temperature greater than about 1200 degrees Celsius. The method generally includes disposing the protective agent noted above within the surface connected voids of the coating at an effective concentration to substantially prevent incursion of CMAS materials into the voids in which the protective agent is disposed.Type: ApplicationFiled: December 12, 2014Publication date: June 16, 2016Inventors: Kristen Hall Brosnan, Shahana Chaterjee, Wayne Charles Hasz, Mohandas Nayak, Digamber Gurudas Porob, Gopi Chandran Ramachandran, Larry Steven Rosenzweig, Shankar Sivaramakrishnan, Alok Mani Srivastava, Venkat Subramaniam Venkataramani
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Publication number: 20160153842Abstract: A method of monitoring a surface temperature of a hot gas path component includes directing an excitation beam having an excitation wavelength at a layer of a sensor material composition deposited on a hot gas path component to induce a fluorescent radiation. The method includes measuring fluorescent radiation emitted by the sensor material composition. The fluorescent radiation includes at least a first intensity at a first wavelength and a second intensity at a second wavelength. The surface temperature of the hot gas path component is determined based on a ratio of the first intensity at the first wavelength and the second intensity at the second wavelength of the fluorescent radiation emitted by the sensor material composition.Type: ApplicationFiled: October 2, 2014Publication date: June 2, 2016Inventors: Mark Allen Cheverton, Anant Achyut Setlur, Victor Petrovich Ostroverkhov, Guanghua Wang, James Anthony Brewer, Venkat Subramaniam Venkataramani
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Publication number: 20160115819Abstract: An article including a substrate and a plurality of coatings disposed on the substrate is presented. The plurality of coatings includes a thermal barrier coating disposed on the substrate; and a protective coating including a calcium-magnesium-aluminum-silicon-oxide (CMAS)-reactive material disposed on the thermal barrier coating. The CMAS-reactive material has an orthorhombic weberite crystal structure. The CMAS-reactive material is present in the plurality of coatings in an effective amount to react with a CMAS composition at an operating temperature of the thermal barrier coating, thereby forming a reaction product having one or both of melting temperature and viscosity greater than that of the CMAS composition. A method of making the article and a related turbine engine component are also presented.Type: ApplicationFiled: October 28, 2014Publication date: April 28, 2016Inventors: Mohandas Nayak, Shankar Sivaramakrishnan, Venkat Subramaniam Venkataramani, Alok Mani Srivastava, Shahana Chatterjee
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Publication number: 20160115818Abstract: An article including a substrate and a plurality of coatings disposed on the substrate is presented. The plurality of coatings includes a thermal barrier coating disposed on the substrate; and a protective coating including a calcium-magnesium-aluminum-silicon-oxide (CMAS)-reactive material disposed on the thermal barrier coating. The CMAS-reactive material includes an NZP-type material. The CMAS-reactive material is present in the plurality of coatings in an effective amount to react with a CMAS composition at an operating temperature of the thermal barrier coating, thereby forming a reaction product having one or both of melting temperature and viscosity greater than that of the CMAS composition. A method of making the article and a related turbine engine component are also presented.Type: ApplicationFiled: October 27, 2014Publication date: April 28, 2016Inventors: Digamber Gurudas Porob, Shankar Sivaramakrishnan, Venkat Subramaniam Venkataramani, Mohandas Nayak, Gopi Chandran Ramachandran
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Patent number: 9034479Abstract: Coating systems and processes by which the coating systems can be deposited to be resistant to contaminants, and particularly resistant to infiltration and damage caused by CMAS. The coating systems include inner and outer ceramic layers. The inner ceramic layer consists essentially of zirconia stabilized by about 6 to about 9 weight percent yttria and optionally contains greater than 0.5 to 10 weight percent hafnium oxide. The outer ceramic layer overlies and contacts the inner ceramic layer to define the outermost surface of the coating system. The outer ceramic layer consists essentially of zirconia stabilized by about 25 to about 75 weight percent yttria, has a thickness that is less than the thickness of the inner ceramic layer and further contains greater than 0.5 to 10 weight percent hafnium oxide and optionally 1 to 10 weight percent tantalum oxide. The outer ceramic layer has a porosity level that is lower than that of the inner ceramic layer.Type: GrantFiled: July 5, 2012Date of Patent: May 19, 2015Assignee: General Electric CompanyInventors: Bangalore Aswatha Nagaraj, Douglas Gerard Konitzer, Julie Marie Chapman, Venkat Subramaniam Venkataramani
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Publication number: 20140238379Abstract: In accordance with one aspect of the present invention, a heating device is presented. The heating device includes a pyrocatalytic, non-stick coating disposed on at least one surface. The pyrocatalytic non-stick coating includes (i) a binder derived from a silane, a polysiloxane, a polysilazane, or combinations thereof; and (ii) a catalyst dispersed within the binder, wherein the catalyst comprises a pervoskite crystalline material, a pyrochlore crystalline material, a spinel crystalline material, an ilmenite crystalline material, or combinations hereof.Type: ApplicationFiled: February 28, 2013Publication date: August 28, 2014Applicant: GENERAL ELECTRIC COMPANYInventors: Venkat Subramaniam Venkataramani, Ravikanth Raju Abbaraju
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Publication number: 20140220378Abstract: Coating systems and processes by which the coating systems can be deposited to be resistant to contaminants, and particularly resistant to infiltration and damage caused by CMAS. The coating systems include inner and outer ceramic layers. The inner ceramic layer consists essentially of zirconia stabilized by about 6 to about 9 weight percent yttria and optionally contains greater than 0.5 to 10 weight percent hafnium oxide. The outer ceramic layer overlies and contacts the inner ceramic layer to define the outermost surface of the coating system. The outer ceramic layer consists essentially of zirconia stabilized by about 25 to about 75 weight percent yttria, has a thickness that is less than the thickness of the inner ceramic layer and further contains greater than 0.5 to 10 weight percent hafnium oxide and optionally 1 to 10 weight percent tantalum oxide. The outer ceramic layer has a porosity level that is lower than that of the inner ceramic layer.Type: ApplicationFiled: July 5, 2012Publication date: August 7, 2014Applicant: GENERAL ELECTRIC COMPANYInventors: Bangalore Aswatha Nagaraj, Douglas Gerard Konitzer, Julie Marie Chapman, Venkat Subramaniam Venkataramani
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Patent number: 8759241Abstract: A method for making a catalyst composition suitable for various purposes, such as the reduction of nitrogen oxides, is provided. The method includes combining dawsonite or a dawsonite derivative with a catalytic active element.Type: GrantFiled: February 25, 2011Date of Patent: June 24, 2014Assignee: General Electric CompanyInventor: Venkat Subramaniam Venkataramani
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Patent number: 8617762Abstract: A method of processing a ceramic electrolyte suitable for use in a fuel cell is provided. The method comprises situating a ceramic electrolyte layer over an anode layer; and subjecting the ceramic electrolyte layer to a stress prior to operation of the fuel cell, by: exposing the top surface of the electrolyte layer to an oxidizing atmosphere and the bottom surface of the electrolyte layer to a reducing atmosphere; and heating the electrolyte layer. The stress causes a substantial increase in the number of microcracks, or in the average size of the microcracks, or in both the number of the microcracks and their average size. A solid oxide fuel cell comprising a ceramic electrolyte layer processed by the disclosed method is also provided.Type: GrantFiled: September 28, 2007Date of Patent: December 31, 2013Assignee: General Electric CompanyInventors: Shu Ching Quek, Chandra Sekher Yerramalli, Todd-Michael Striker, Badri Narayan Ramamurthi, Sylvia Marie DeCarr, Venkat Subramaniam Venkataramani
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Patent number: 8476187Abstract: The present invention details a process for producing a catalyst powder. The steps of the process include preparing catalyst slurry, drying, pyrolyzing, and calcining the catalyst slurry to obtain a calcined catalyst powder. The catalyst slurry comprises a catalyst, a liquid carrier, a templating agent, and a catalyst substrate. The catalyst slurry is dried to obtain a raw catalyst powder. The raw catalyst powder is heated in a first controlled atmosphere to obtain a pyrolyzed catalyst powder and the pyrolyzed catalyst powder is calcined in a second controlled atmosphere to obtain a calcined catalyst powder. A method of fabricating a catalyst surface and catalytic converter using the prepared catalyst powder is also illustrated.Type: GrantFiled: January 6, 2010Date of Patent: July 2, 2013Assignee: General Electric CompanyInventors: Daniel George Norton, Larry Neil Lewis, Elliott West Shanklin, Frederic Joseph Klug, Venkat Subramaniam Venkataramani, Robert Joseph Lyons, Dan Hancu, Benjamin Hale Winkler, Hrishikesh Keshavan
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Patent number: 8337939Abstract: A method of processing a ceramic layer is provided. The method comprises the steps of providing a ceramic layer comprising a plurality of microcracks; infiltrating at least some of the plurality of microcracks with a liquid precursor comprising at least one oxidizable metal ion; and exposing the ceramic layer to a base having a pH value of at least about 9, so as to chemically convert the oxidizable metal ion into an oxide, thereby decreasing the porosity of the ceramic layer. A solid oxide fuel cell is provided. The solid oxide fuel cell comprises an anode; a cathode; and a ceramic electrolyte disposed between the anode and the cathode.Type: GrantFiled: September 13, 2007Date of Patent: December 25, 2012Assignee: General Electric CompanyInventors: Todd-Michael Striker, Venkat Subramaniam Venkataramani, James Anthony Ruud
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Publication number: 20120220447Abstract: A method for making a catalyst composition suitable for various purposes, such as the reduction of nitrogen oxides, is provided. The method includes combining dawsonite or a dawsonite derivative with a catalytic active element.Type: ApplicationFiled: February 25, 2011Publication date: August 30, 2012Applicant: GENERAL ELECTRIC COMPANYInventor: Venkat Subramaniam Venkataramani
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Publication number: 20120178015Abstract: A method of processing a ceramic electrolyte suitable for use in a fuel cell is provided. The method comprises situating a ceramic electrolyte layer over an anode layer; and subjecting the ceramic electrolyte layer to a stress prior to operation of the fuel cell, by: exposing the top surface of the electrolyte layer to an oxidizing atmosphere and the bottom surface of the electrolyte layer to a reducing atmosphere; and heating the electrolyte layer. The stress causes a substantial increase in the number of microcracks, or in the average size of the microcracks, or in both the number of the microcracks and their average size. A solid oxide fuel cell comprising a ceramic electrolyte layer processed by the disclosed method is also provided.Type: ApplicationFiled: September 28, 2007Publication date: July 12, 2012Applicant: GENERAL ELECTRIC COMPANYInventors: Shu Ching Quek, Chandra Sekher Yerramalli, Todd-Michael Striker, Badri Narayan Ramamurthi, Sylvia Marie DeCarr, Venkat Subramaniam Venkataramani
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Patent number: 8189633Abstract: A polycrystalline transparent ceramic article including lutetium is presented. The article includes an oxide with a formula of ABO3, having type A lattice sites and type B lattice sites. The lattice site A may further comprise a plurality of elements, in addition to lutetium. Type B lattice site includes aluminum. An imaging device, a laser assembly, and a scintillator including the lutetium-based article is provided. A method of making the above article is also provided.Type: GrantFiled: January 21, 2010Date of Patent: May 29, 2012Assignee: General Electric CompanyInventors: Kalaga Murali Krishna, Venkat Subramaniam Venkataramani, Mohan Manoharan
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Publication number: 20110315338Abstract: Shell molds and processes for making the shell molds that exhibit high emissivity in the red and infrared regions. In this manner, thermal resistance within a gap formed between solidifying cast metal and the interior mold surface is decreased. In one embodiment, the facecoat region is formed from a slurry composition comprising an aluminum oxide, a green chromium oxide and a silicon dioxide. In another embodiment, the facecoat region is formed from a slurry composition including zirconium silicate and silica with stucco layer of alumina is included.Type: ApplicationFiled: September 7, 2011Publication date: December 29, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Michael Francis Xavier Gigliotti, Shyh-Chin Huang, Adegboyega Masud Makinde, Roger John Petterson, Stephen Francis Rutkowski, Venkat Subramaniam Venkataramani
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Patent number: 8033320Abstract: Shell molds and processes for making the shell molds that exhibit high emissivity in the red and infrared regions. In this manner, thermal resistance within a gap formed between solidifying cast metal and the interior mold surface is decreased. In one embodiment, the facecoat region is formed from a slurry composition comprising an aluminum oxide, a green chromium oxide and a silicon dioxide. In another embodiment, the facecoat region is formed from a slurry composition including zirconium silicate and silica with stucco layer of alumina is included.Type: GrantFiled: July 25, 2008Date of Patent: October 11, 2011Assignee: General Electric CompanyInventors: Michael Francis Xavier Gigliotti, Shyh-Chin Huang, Adegboyega Masud Makinde, Roger John Petterson, Stephen Francis Rutkowski, Venkat Subramaniam Venkataramani
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Patent number: 7989530Abstract: A nonlinear composition comprises a polymeric material and at least one ferroelectric, antiferroelectric, or paraelectric particle, wherein the composition has a permittivity greater than or equal to about 5. A method of making a nonlinear composition comprises combining a polymeric material, and at least one ferroelectric, antiferroelectric, or paraelectric particle. The composition has a permittivity greater than or equal to about 5.Type: GrantFiled: July 25, 2008Date of Patent: August 2, 2011Assignee: General Electric CompanyInventors: Daniel Qi Tan, Patricia Chapman Irwin, Yang Cao, Venkat Subramaniam Venkataramani
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Patent number: 7978402Abstract: Articles transparent to infrared radiation and resistant to impact and wear are provided. The article comprises a substrate and a composite coating disposed over the substrate and extending from an interface with the substrate to an external surface. The composite coating comprises a first phase and a second phase. The second phase has a higher resistance to erosive wear than the first phase. The coating comprises a compositional gradient proceeding from a first composition at the interface of the coating with the substrate to a second composition at the external surface, the first composition comprising a higher concentration of the first phase than that of the second composition.Type: GrantFiled: June 28, 2007Date of Patent: July 12, 2011Assignee: General Electric CompanyInventors: Sean Michael Sweeney, Timothy James Yosenick, Dalong Zhong, Milivoj Konstantin Brun, Sergio Paulo Martins Loureiro, Venkat Subramaniam Venkataramani, Mohan Manoharan
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Publication number: 20110166015Abstract: The present invention details a process for producing a catalyst powder. The steps of the process include preparing catalyst slurry, drying, pyrolyzing, and calcining the catalyst slurry to obtain a calcined catalyst powder. The catalyst slurry comprises a catalyst, a liquid carrier, a templating agent, and a catalyst substrate. The catalyst slurry is dried to obtain a raw catalyst powder. The raw catalyst powder is heated in a first controlled atmosphere to obtain a pyrolyzed catalyst powder and the pyrolyzed catalyst powder is calcined in a second controlled atmosphere to obtain a calcined catalyst powder. A method of fabricating a catalyst surface and catalytic converter using the prepared catalyst powder is also illustrated.Type: ApplicationFiled: January 6, 2010Publication date: July 7, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Daniel George Norton, Larry Neil Lewis, Elliott West Shanklin, Frederic Joseph Klug, Venkat Subramaniam Venkataramani, Robert Joseph Lyons, Dan Hancu, Benjamin Hale Winkler, Hrishikesh Keshavan
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Patent number: 7964294Abstract: An easy to clean and stain resistant coating for a cooking product includes an oxycarbofluoride coating. The oxycarbofluoride coating has a composition comprising at least one metal oxide, carbon and fluorine and can be applied to a substrate using a sol-gel process.Type: GrantFiled: July 8, 2008Date of Patent: June 21, 2011Assignee: General Electric CompanyInventors: Venkat Subramaniam Venkataramani, Salil Mohan Joshi, Nagaveni Karkada, Sundeep Kumar