Patents by Inventor Atanu Saha
Atanu Saha 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: 20170268535Abstract: The turbomachine includes a compressor, an inner annular casing, and an outer annular casing. The inner annular casing and the outer annular casing define at least one cavity therebetween. The clearance control system includes a manifold system including at least one conduit disposed within the cavities and configured to channel a flow of cooling fluid between the cavities. The clearance control system also includes an impingement system including a header and at least one plenum configured to channel the flow of cooling fluid to the inner annular casing. The conduits configured to channel the flow of cooling fluid to the impingement system. The clearance control system further includes a channel system including at least one channels configured to channel the flow of cooling fluid to the turbomachine. The channels are configured to control the flow of cooling fluid to the manifold system.Type: ApplicationFiled: March 2, 2017Publication date: September 21, 2017Inventors: Bhaskar Nanda Mondal, Kenneth Edward Seitzer, Monty Lee Shelton, Thomas Ory Moniz, Atanu Saha
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Publication number: 20170247787Abstract: Methods of forming an environmental barrier coating are disclosed. A method includes disposing a powder-based coating on a substrate, heat-treating the powder-based coating at a temperature greater than 800° C. and less than 1200° C. to form a porous coating that includes surface-connected pores, infiltrating at least some of the surface-connected pores of the porous coating with an infiltrant material to form an infiltrated coating, and sintering the infiltrated coating at a temperature greater than 1200° C. and less than 1500° C. to form the environmental barrier coating on the substrate.Type: ApplicationFiled: February 14, 2017Publication date: August 31, 2017Inventors: Atanu SAHA, Nicholas Edward ANTOLINO, Don Mark LIPKIN
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Publication number: 20170175769Abstract: The turbomachine includes a rotatable member defining an axis of rotation and an inner annular casing extending circumferentially over at least a portion of the rotatable member. The inner annular casing includes a radially outer surface. The turbomachine further includes an outer annular casing extending over at least a portion of the inner annular casing. The inner annular casing and the outer annular casing define a plurality of cavities therebetween. The clearance control system includes a manifold system including a plurality of conduits extending circumferentially about the inner annular casing and disposed within the cavities. The clearance control system also includes an impingement system extending circumferentially about the inner annular casing and disposed within the cavities. The conduits are configured to channel a flow of cooling fluid to the impingement system which is configured to channel the cooling fluid to the radially outer surface of the inner annular casing.Type: ApplicationFiled: December 21, 2015Publication date: June 22, 2017Inventors: Changjie Sun, Yu Xie Mukherjee, Bhaskar Nanda Mondal, Atanu Saha, Marcia Boyle Johnson, Wenfeng Lu
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Patent number: 9368774Abstract: An electrolyte separator structure is provided. The electrolyte separator structure comprises a graded integral structure, wherein the structure comprises an ion-conducting first ceramic at a first end and an electrically insulating second ceramic at a second end, wherein the difference in the coefficient of thermal expansion of the ion-conducting first ceramic and the electrically insulating second ceramic is less than or equal to about 5 parts per million per degrees Centigrade, and wherein at least one of the first ceramic or the second ceramic comprises a strengthening agent. Method of making the ion-separator structure is provided. Electrochemical cells comprising the ion-separator structure and method of making the electrochemical cell using the ion-separator structure are also provided.Type: GrantFiled: March 24, 2010Date of Patent: June 14, 2016Assignee: General Electric CompanyInventors: Sundeep Kumar, Mohamed Rahmane, Mohandas Nayak, Arunabh Basak, Kalaga Murali Krishna, Atanu Saha
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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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Patent number: 8779283Abstract: A method, in certain embodiments, includes providing a metal alloy, annealing the metal alloy, and contacting the metal alloy with vapors of selenium, or sulfur, or a combination thereof. The metal alloy having a uniform first bulk composition and a first surface composition on annealing provides an annealed metal alloy having a non uniform second bulk composition and a second surface composition which on being contacted vapors of selenium, or sulfur, or a combination thereof, produces a selenized or a sulfurized metal alloy. Further the metal alloy may have a layer formed in situ from a low melting point metal within the alloy via diffusion rather than sequential deposition and co-evaporation.Type: GrantFiled: February 29, 2008Date of Patent: July 15, 2014Assignee: General Electric CompanyInventors: Sheela Kollali Ramasesha, Sundeep Kumar, Mohandas Nayak, Atanu Saha, Hemantkumar Narsinham Aiyer
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Patent number: 8764993Abstract: A method of making a porous SiOC membrane is provided. The method comprises disposing a SiOC layer on a porous substrate, and etching the SiOC layer to form through pores in the SiOC layer. A porous SiOC membrane having a network of pores extending through a thickness of the membrane is provided.Type: GrantFiled: April 3, 2008Date of Patent: July 1, 2014Assignee: General Electric CompanyInventors: Atanu Saha, Salil Mohan Joshi, An-Ping Zhang
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Patent number: 8692564Abstract: A method for use in determining the thickness of a layer of interest in a multi-layer structure. A first electrode is positioned in contact with a first surface of the multi-layer structure, and a second electrode is positioned in contact with a second surface of the multi-layer structure. The second surface is substantially opposite the first surface. The first electrode is pressed against the multi-layer structure at a predetermined sampling pressure, and the structure is optionally adjusted to a predetermined sampling temperature. The electrical impedance between the first electrode and the second electrode is measured.Type: GrantFiled: February 4, 2011Date of Patent: April 8, 2014Assignee: General Electric CompanyInventors: Atanu Saha, Krishnamurthy Anand, Hari Nadathur Seshadri, Karthick Vilapakkam Gourishankar, Filippo Cappuccini
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Patent number: 8354899Abstract: Provided is a device, such as a switch structure, that includes a contact and a conductive element that is configured to be deformable between a first position in which the conductive element is separated from the contact and a second position in which the conductive element contacts the contact. The conductive element can be formed substantially of metallic material configured to inhibit time-dependent deformation. For example, the metallic material may be configured to exhibit a maximum steady-state plastic strain rate of less than 10?12 s?1 when subject to a stress of at least about 25 percent of a yield strength of the metallic material and a temperature less than or equal to about half of a melting temperature of the metallic material. The contact and the conductive element may be part of a microelectromechanical device or a nanoelectromechanical device. Associated methods are also provided.Type: GrantFiled: September 23, 2009Date of Patent: January 15, 2013Assignee: General Electric CompanyInventors: Christopher Fred Keimel, Marco Francesco Aimi, Shubhra Bansal, Reed Roeder Corderman, Kuna Venkat Satya Rama Kishore, Eddula Sudhakar Reddy, Atanu Saha, Kanakasabapathi Subramanian, Parag Thakre, Alex David Corwin
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Publication number: 20120200304Abstract: A method for use in determining the thickness of a layer of interest in a multi-layer structure. A first electrode is positioned in contact with a first surface of the multi-layer structure, and a second electrode is positioned in contact with a second surface of the multi-layer structure. The second surface is substantially opposite the first surface. The first electrode is pressed against the multi-layer structure at a predetermined sampling pressure, and the structure is optionally adjusted to a predetermined sampling temperature. The electrical impedance between the first electrode and the second electrode is measured.Type: ApplicationFiled: February 4, 2011Publication date: August 9, 2012Inventors: Atanu Saha, Krishnamurthy Anand, Hari Nadathur Seshadri, Karthick Vilapakkam Gourishankar, Filippo Cappuccini
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Publication number: 20110236743Abstract: An electrolyte separator structure is provided. The electrolyte separator structure comprises a graded integral structure, wherein the structure comprises an ion-conducting first ceramic at a first end and an electrically insulating second ceramic at a second end, wherein the difference in the coefficient of thermal expansion of the ion-conducting first ceramic and the electrically insulating second ceramic is less than or equal to about 5 parts per million per degrees Centigrade, and wherein at least one of the first ceramic or the second ceramic comprises a strengthening agent. Method of making the ion-separator structure is provided. Electrochemical cells comprising the ion-separator structure and method of making the electrochemical cell using the ion-separator structure are also provided.Type: ApplicationFiled: March 24, 2010Publication date: September 29, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Sundeep Kumar, Mohamed Rahmane, Mohandas Nayak, Arunabh Basak, Kalaga Murali Krishna, Atanu Saha
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Publication number: 20110223475Abstract: A seal structure is provided for an energy storage device. The seal structure includes a sealing glass joining an ion-conducting first ceramic to an electrically insulating second ceramic, wherein the ion-conducting first ceramic has an anode surface defining an anode compartment and a cathode surface defining a cathode compartment, wherein the sealing glass has an exposed portion, wherein the exposed portion is open to one or more of the anode compartment and the cathode compartment, wherein the exposed portion of the sealing glass is coated with a coating composition comprising one or more of boria, alumina, titania, zirconia, yttria, and ceria. Methods for forming the seal structure and article made therefrom are also provided.Type: ApplicationFiled: March 10, 2010Publication date: September 15, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Digamber Gurudas Porob, Dong-Sil Park, Sundeep Kumar, Atanu Saha
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Publication number: 20110154832Abstract: Provided is a method that includes providing a granular first material (e.g., a magnetocaloric material) and a sinterable second material. The granular first material and the sinterable second material can be combined to form an aggregate. Once the aggregate has been formed, localized sintering of the aggregate can be performed, for example, such that, subsequent to localized sintering, the second material is substantially contiguous and binds the granular first material. Associated compositions and systems are also provided.Type: ApplicationFiled: December 29, 2009Publication date: June 30, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Jayeshkumar Jayanarayan Barve, Sudhakar Eddula Reddy, Chandrasekhar Samiappan, Duraiswamy Srinivasan, Francis Johnson, Atanu Saha
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Publication number: 20110139404Abstract: A method is provided, the method including providing a first tubular structure that defines a first passage. A sacrificial material can be disposed in the first passage. A second tubular structure can be provided so as to be adjacent to the first tubular structure, with the second tubular structure defining a second passage within which can be disposed a granular material. The first and second tubular structures can be deformed together so as to reduce an external dimension of each of the first and second tubular structures. The sacrificial material can then be removed from the first passage.Type: ApplicationFiled: December 16, 2009Publication date: June 16, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Sudhakar Eddula Reddy, Jayeshkumar Jayanarayan Barve, Francis Johnson, Atanu Saha
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Patent number: 7939050Abstract: A method for making a composite includes combining a strengthening agent and an aluminum compound to form a first solution; precipitating an Al(OH)3 gel from the first solution, wherein strengthening agent particles are dispersed within the gel; washing the Al(OH)3 gel with an alcohol; contacting the Al(OH)3 gel with a salt; drying the Al(OH)3 gel to form a powder; calcining the powder to convert Al(OH)3 to Al2O3; and sintering the powder to form a composite article comprising beta double prime alumina.Type: GrantFiled: May 19, 2008Date of Patent: May 10, 2011Assignee: General Electric CompanyInventors: Atanu Saha, Adyam Srinivasa Mukunda
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Publication number: 20110067983Abstract: Provided is a device, such as a switch structure, that includes a contact and a conductive element that is configured to be deformable between a first position in which the conductive element is separated from the contact and a second position in which the conductive element contacts the contact. The conductive element can be formed substantially of metallic material configured to inhibit time-dependent deformation. For example, the metallic material may be configured to exhibit a maximum steady-state plastic strain rate of less than 10?12 s?1 when subject to a stress of at least about 25 percent of a yield strength of the metallic material and a temperature less than or equal to about half of a melting temperature of the metallic material. The contact and the conductive element may be part of a microelectromechanical device or a nanoelectromechanical device. Associated methods are also provided.Type: ApplicationFiled: September 23, 2009Publication date: March 24, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Christopher Fred Keimel, Marco Francesco Aimi, Shubhra Bansal, Reed Roeder Corderman, Kuna Venkat Satya Rama Kishore, Eddula Sudhakar Reddy, Atanu Saha, Kanakasabapathi Subramanian, Parag Thakre, Alex David Corwin
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Publication number: 20110048031Abstract: A regenerator having a thermal diffusivity matrix is presented. The thermal diffusivity matrix includes magneto-caloric material having multiple miniature protrusions intimately packed to form a gap between the protrusions. A fluid path is provided within the gap to facilitate flow of a heat exchange fluid and further provide efficient thermal exchange between the heat exchange fluid and magneto-caloric material. A first layer is disposed on each of the miniature protrusion to physically isolate the heat exchange fluid and magneto-caloric material, wherein the first layer further includes a soft magnetic material configured to simultaneously enhance a permeability and a thermal efficiency of the thermal diffusivity matrix.Type: ApplicationFiled: August 28, 2009Publication date: March 3, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Jayeshkumar Jayanarayan Barve, Chandrasekhar Samiappan, Sudhakar Eddula Reddy, Francis Johnson, Atanu Saha, Kalaga Murali Krishna, Mahesh Chandran
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Publication number: 20090285733Abstract: A method for making a composite includes combining a strengthening agent and an aluminum compound to form a first solution; precipitating an Al(OH)3 gel from the first solution, wherein strengthening agent particles are dispersed within the gel; washing the Al(OH)3 gel with an alcohol; contacting the Al(OH)3 gel with a salt; drying the Al(OH)3 gel to form a powder; calcining the powder to convert Al(OH)3 to Al2O3; and sintering the powder to form a composite article comprising beta double prime alumina.Type: ApplicationFiled: May 19, 2008Publication date: November 19, 2009Applicant: GENERAL ELECTRIC COMPANYInventors: Atanu Saha, Adyam Srinivasa Mukunda
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Publication number: 20090252971Abstract: A method of making a porous SiOC membrane is provided. The method comprises disposing a SiOC layer on a porous substrate, and etching the SiOC layer to form through pores in the SiOC layer. A porous SiOC membrane having a network of pores extending through a thickness of the membrane is provided.Type: ApplicationFiled: April 3, 2008Publication date: October 8, 2009Applicant: GENERAL ELECTRIC COMPANYInventors: Atanu Saha, Salil Mohan Joshi, An-Ping Zhang
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Publication number: 20090139573Abstract: A method, in certain embodiments, includes providing a metal alloy, annealing the metal alloy, and contacting the metal alloy with vapors of selenium, or sulfur, or a combination thereof. The metal alloy having a uniform first bulk composition and a first surface composition on annealing provides an annealed metal alloy having a non uniform second bulk composition and a second surface composition which on being contacted vapors of selenium, or sulfur, or a combination thereof, produces a selenized or a sulfurized metal alloy. Further the metal alloy may have a layer formed in situ from a low melting point metal within the alloy via diffusion rather than sequential deposition and co-evaporation.Type: ApplicationFiled: February 29, 2008Publication date: June 4, 2009Applicant: GENERAL ELECTRIC COMPANYInventors: Sheela Kollali Ramasesha, Sundeep Kumar, Mohandas Nayak, Atanu Saha, Hemantkumar Narsinham Aiyer