Patents by Inventor Mamatha Nagesh
Mamatha Nagesh 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: 20240117481Abstract: Methods are provided for forming a thermal barrier coating having a non-linear compositional gradient and/or a non-linear porosity gradient, along with coated components formed therefrom. The method includes spraying a deposition mixture of a first composition and a second composition via a solution precursor plasma spray apparatus onto a surface of a substrate; while spraying the deposition mixture, adjusting at least one deposition parameter such that the thermal barrier coating is formed with the non-linear gradient.Type: ApplicationFiled: October 10, 2022Publication date: April 11, 2024Inventors: Margeaux Wallace, Mamatha Nagesh, Mohandas Nayak, Sundeep Kumar, Bernard Patrick Bewlay, Julie Marie Kuhn
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Publication number: 20240084703Abstract: Methods for repairing a thermal barrier coating deposited on a component with localized spallation of the thermal barrier coating includes depositing a primer slurry on a thermally grown oxide of the component exposed by the localized spallation, depositing a ceramic slurry on the primer slurry, and heating the primer slurry and the ceramic slurry. The primer slurry includes a primer that includes at least one of a metal and a metal oxide. The ceramic slurry includes a ceramic material, a ceramic slurry binder material, and a ceramic slurry fluid carrier. Heating the primer slurry and the ceramic slurry forms a first chemical bond between the primer and the thermally grown oxide and a second chemical bond between the primer and the ceramic material.Type: ApplicationFiled: August 29, 2023Publication date: March 14, 2024Applicant: General Electric CompanyInventors: Atanu Saha, Hrishikesh Keshavan, Mamatha Nagesh, Ambarish J. Kulkarni, Bernard P. Bewlay
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Publication number: 20230330700Abstract: Coated components, along with methods of their formation, are provided. The coated component may include a substrate having a surface and a thermal barrier coating on the surface of the substrate. The thermal barrier coating includes a plurality of elongated surface-connected voids therein, and wherein the thermal barrier coating comprises a plurality of nonspherical particles within a thermal barrier material.Type: ApplicationFiled: December 19, 2022Publication date: October 19, 2023Inventors: Margeaux Wallace, Mamatha Nagesh, Mohandas Nayak, Sundeep Kumar, Bernard Patrick Bewlay, Julie Marie Kuhn
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Patent number: 11655720Abstract: A sprayable thermal barrier coating powder mixture for a gas turbine engine includes: a dry composition having a low surface area ceramic powder having a median particle size distribution greater than 5 microns and less than 50 microns, and a high surface area ceramic powder having a median particle size distribution smaller than 5 microns, wherein the low surface area ceramic powder makes up at least 50% by weight of the dry composition of the sprayable thermal barrier coating powder mixture.Type: GrantFiled: May 6, 2021Date of Patent: May 23, 2023Assignee: General Electric CompanyInventors: Hrishikesh Keshavan, Atanu Saha, Margeaux Wallace, Mamatha Nagesh, Ambarish Jayant Kulkarni, Bernard Patrick Bewlay, Jr.
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Publication number: 20230101282Abstract: A corrosion resistant coating including a matrix, corrosion resistant particles dispersed throughout the matrix, and a glass-forming additive is disclosed. The glass-forming additive and one or more materials in the matrix form a glassy-phase when cured. Coated gas turbine engine components and methods for coating components are also disclosed.Type: ApplicationFiled: September 28, 2021Publication date: March 30, 2023Inventors: Mamatha Nagesh, Atanu Saha, Srinivasan Swaminathan
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Patent number: 11549382Abstract: A coated component of a gas turbine engine includes a substrate defining a surface, a thermal barrier coating deposited on the surface of the substrate, a region of the component where the thermal barrier coating has spalled from the substrate, a layer of environmental contaminant compositions formed on one or more of the thermal barrier coating or the region of the component where the thermal barrier coating has spalled from the substrate in response to an initial exposure of the component to high operating temperatures of the gas turbine engine, and a thermal barrier coating (TBC) restoration coating deposited at least on the region of the component where there thermal barrier coating has spalled from the substrate.Type: GrantFiled: November 4, 2020Date of Patent: January 10, 2023Assignee: General Electric CompanyInventors: Hrishikesh Keshavan, Ambarish Jayant Kulkarni, Margeaux Wallace, Byron Andrew Pritchard, Jr., Almed M. Elkady, Atanu Saha, Mamatha Nagesh, Bernard Patrick Bewlay
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Publication number: 20220169551Abstract: Methods for forming a sintered patch on a silicon-based substrate are disclosed. The methods include applying a patch slurry on the silicon-based substrate, drying the patch slurry on the silicon-based substrate to form a dried patch material, and sintering the dried patch material in an oxidizing atmosphere to form a sintered patch on the silicon-based substrate. The patch slurry includes a patch material containing silicates in a fluid carrier.Type: ApplicationFiled: December 1, 2020Publication date: June 2, 2022Inventors: Atanu Saha, Manepalli Satya Kishore, Nicholas Edward Antolino, Don Mark Lipkin, Mamatha Nagesh
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Publication number: 20210396181Abstract: A sprayable thermal barrier coating powder mixture for a gas turbine engine includes: a dry composition having a low surface area ceramic powder having a median particle size distribution greater than 5 microns and less than 50 microns, and a high surface area ceramic powder having a median particle size distribution smaller than 5 microns, wherein the low surface area ceramic powder makes up at least 50% by weight of the dry composition of the sprayable thermal barrier coating powder mixture.Type: ApplicationFiled: May 6, 2021Publication date: December 23, 2021Inventors: Hrishikesh Keshavan, Atanu Saha, Margeaux Wallace, Mamatha Nagesh, Ambarish Jayant Kulkarni, Bernard Patrick Bewlay, JR.
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Publication number: 20210131305Abstract: A coated component of a gas turbine engine includes a substrate defining a surface, a thermal barrier coating deposited on the surface of the substrate, a region of the component where the thermal barrier coating has spalled from the substrate, a layer of environmental contaminant compositions formed on one or more of the thermal barrier coating or the region of the component where the thermal barrier coating has spalled from the substrate in response to an initial exposure of the component to high operating temperatures of the gas turbine engine, and a thermal barrier coating (TBC) restoration coating deposited at least on the region of the component where there thermal barrier coating has spalled from the substrate.Type: ApplicationFiled: November 4, 2020Publication date: May 6, 2021Inventors: Hrishikesh Keshavan, Ambarish Jayant Kulkarni, Margeaux Wallace, Byron Andrew Pritchard, JR., Almed M. Elkady, Atanu Saha, Mamatha Nagesh, Bernard Patrick Bewlay
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Patent number: 10981196Abstract: A silicone bond coat composition having a viscosity of less than 1,600 centistokes is applied to substantially all external surfaces of the article and then cured. A liquid silicone elastomer outer coat composition comprising a high viscosity first liquid silicone elastomer formulation and a low viscosity second liquid silicone elastomer formulation is then applied and cured to provide a protected article having a complex shape. Optimal coatings result from a careful balancing of component viscosities. In an embodiment, the first formulation has a viscosity greater than 300,000 centistokes, and the second formulation has a viscosity less than 6,000 centistokes, and the liquid silicone elastomer outer coat composition comprises from about 60 to about 40 percent by weight of the first formulation and from about 40 to about 60 percent by weight of the second liquid silicone elastomer formulation.Type: GrantFiled: December 1, 2015Date of Patent: April 20, 2021Assignee: GENERAL ELECTRIC COMPANYInventors: Atanu Saha, Gopi Chandran Ramachandran, Mamatha Nagesh, Shalini Thimmegowda, Bala Srinivasan Parthasarathy
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Patent number: 10126025Abstract: A magneto-caloric assembly can include a first region including a first magneto-caloric material, a second region disposed on the first region and including a second magneto-caloric material and a first matrix material, and a third region disposed on the second region and including a thermally conductive material.Type: GrantFiled: July 24, 2014Date of Patent: November 13, 2018Assignee: HAIER US APPLIANCE SOLUTIONS, INC.Inventors: Mamatha Nagesh, Atanu Saha, Francis Johnson
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Publication number: 20170326587Abstract: A silicone bond coat composition having a viscosity of less than 1,600 centistokes is applied to substantially all external surfaces of the article and then cured. A liquid silicone elastomer outer coat composition comprising a high viscosity first liquid silicone elastomer formulation and a low viscosity second liquid silicone elastomer formulation is then applied and cured to provide a protected article having a complex shape. Optimal coatings result from a careful balancing of component viscosities. In an embodiment, the first formulation has a viscosity greater than 300,000 centistokes, and the second formulation has a viscosity less than 6,000 centistokes, and the liquid silicone elastomer outer coat composition comprises from about 60 to about 40 percent by weight of the first formulation and from about 40 to about 60 percent by weight of the second liquid silicone elastomer formulation.Type: ApplicationFiled: December 1, 2015Publication date: November 16, 2017Inventors: Atanu SAHA, Gopi Chandran RAMACHANDRAN, Mamatha NAGESH, Shalini THIMMEGOWDA, Bala Srinivasan PARTHASARATHY
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Publication number: 20160161156Abstract: A magneto-caloric assembly is provided. The assembly includes a first region comprising a first magneto-caloric material, a second region disposed on the first region and comprising a second magneto-caloric material and a first matrix material, and a third region disposed on the second region and comprising a thermally conductive material.Type: ApplicationFiled: July 24, 2014Publication date: June 9, 2016Inventors: Mamatha Nagesh, Atanu Saha, Francis Johnson
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Publication number: 20150008821Abstract: A discharge lamp including an arc envelope defining a chamber and a first opening. A plug is positioned in the first opening through a first seal. The lamp further includes a dosing tube extending away from the chamber, and having a passageway extending into the chamber through a second opening in the arc envelope. The dosing tube is coupled to the arc envelope via a second seal. The first seal, the second seal, or both seals include a braze material having an active metal element in an amount ranging from about 0.1 weight percent to about 10 weight percent, based on the total weight of the braze material.Type: ApplicationFiled: July 3, 2014Publication date: January 8, 2015Inventors: Sundeep KUMAR, Mamatha NAGESH, Raghu RAMAIAH
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Publication number: 20140069988Abstract: The present disclosure generally relates to methods of using active braze techniques in high temperature rechargeable batteries. In some specific embodiments, the present disclosure relates to a method of sealing a portion of an insulated alpha alumina or spinel collar and a metal ring of a sodium metal halide battery.Type: ApplicationFiled: September 12, 2012Publication date: March 13, 2014Applicant: GENERAL ELECTRIC COMPANYInventors: Sundeep KUMAR, Raghavendra ADHARAPURAPU, Mamatha NAGESH, Kalaga Murali KRISHNA, Jeffrey KERCHNER, Laurent CRETEGNY, Mohamed RAHMANE
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Patent number: 8603659Abstract: A sealing glass composition includes from about 10 molar percent to about 30 molar percent barium oxide, from about 15 molar percent to about 30 molar percent aluminum oxide, from about 40 molar percent to about 60 molar percent boron oxide and from about 1 molar percent to about 20 molar percent yttrium oxide. Methods for preparing the sealing glass and a sodium battery cell are also provided.Type: GrantFiled: October 3, 2008Date of Patent: December 10, 2013Assignee: General Electric CompanyInventors: Sundeep Kumar, Mamatha Nagesh, Digamber Porob, Vinayak Hassan Vishwanath
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Publication number: 20110312860Abstract: A composition for a wear-resistant and low-friction coating is presented. The coating composition includes a hard ceramic phase, a metallic binder phase and a lubricant phase. The lubricant phase includes a multi-component oxide. An article having a wear-resistant and low-friction coating and a method of making such a coating are also described.Type: ApplicationFiled: June 17, 2010Publication date: December 22, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Paul Mathew, Krishnamurthy Anand, Mohandas Nayak, Mamatha Nagesh, Shalini Thimmegowda
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Publication number: 20110297532Abstract: An apparatus, such as a plasma generation system, is provided. The apparatus can include a chamber that may be formed, for example, substantially of insulating material. The chamber can be configured to establish therein a stable glow discharge plasma having a pressure of at least about atmospheric pressure while vibrating a sample so as to be milled by bodies contained by the chamber. For example, the chamber may vibrate and/or rotate, and the chamber can include at least one body that includes insulating material and is free within the chamber. Associated methods are also provided.Type: ApplicationFiled: June 7, 2010Publication date: December 8, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Jay Chakraborty, Sudhakar Eddula Reddy, Mamatha Nagesh, Ravikumar Hanumantha, Jayeshkumar Jayanarayan Barve, Francis Johnson
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Patent number: 8043986Abstract: A sealing glass for an energy storage device is provided. The sealing glass includes silicon dioxide, boron oxide, aluminum oxide, sodium oxide and zirconium oxide. Methods for preparing the sealing glass and the energy storage device incorporating the sealing glass are also provided.Type: GrantFiled: November 13, 2008Date of Patent: October 25, 2011Assignee: General Electric CompanyInventors: Dong-Sil Park, Jian Wu, Mamatha Nagesh, Sundeep Kumar, Craig Stringer, Digamber Porob, Vinayak Hassan Vishwanath
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Publication number: 20100120602Abstract: A sealing glass for an energy storage device is provided. The sealing glass includes silicon dioxide, boron oxide, aluminum oxide, sodium oxide and zirconium oxide. Methods for preparing the sealing glass and the energy storage device incorporating the sealing glass are also provided.Type: ApplicationFiled: November 13, 2008Publication date: May 13, 2010Inventors: Dong-Sil Park, Jian Wu, Mamatha Nagesh, Sundeep Kumar, Craig Stringer, Digamber Porob, Vinayak Hassan Vishwanath