Patents by Inventor Yeshwanth Narendar
Yeshwanth Narendar 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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Patent number: 10658684Abstract: A glass-ceramic seal for ionic transport devices such as solid oxide fuel cell stacks or oxygen transport membrane applications. Preferred embodiments of the present invention comprise glass-ceramic sealant material based on a Barium-Aluminum-Silica system, which exhibits a high enough coefficient of thermal expansion to closely match the overall CTE of a SOFC cell/stack (preferably from about 11 to 12.8 ppm/° C.), good sintering behavior, and a very low residual glass phase (which contributes to the stability of the seal).Type: GrantFiled: June 7, 2016Date of Patent: May 19, 2020Assignee: SAINT-GOBAIN CERAMICS & PLASTICS, INC.Inventors: Signo T. Reis, Matthieu Jérôme Schwartz, Morteza Zandi, Yeshwanth Narendar
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Publication number: 20200039027Abstract: An abrasive article can include a wear detection sensor embedded within the abrasive body or extending along an exterior surface of the abrasive body. The wear detection sensor can include at least one conductive lead and be designed to create one or more wear signals corresponding to the wear stage of the abrasive body. The at least one conductive lead can be coupled to a logic device, which may control the wear detection sensor and register the wear signal(s).Type: ApplicationFiled: August 2, 2019Publication date: February 6, 2020Inventors: Remi J. GOULET, Vivek SINGH, Sethumadhavan RAVICHANDRAN, Thierry DESIRE, Karen CONLEY, Robin Chandras JAYARAM, Arunvel THANGAMANI, Yeshwanth NARENDAR, Brian RUTKIEWICZ, Rajappa TADEPALLI
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Patent number: 10081575Abstract: A sintered ceramic component can have a final composition including at least 50 wt. % MgO and at least one desired dopant, wherein each dopant of the at least one desired dopant has a desired dopant content of at least 0.1 wt. %. All impurities (not including the desired dopant(s)) are present at a combined impurity content of less than 0.7 wt. %. A remainder can include Al2O3. The selection of dopants can allow for better control over the visual appearance of the sintered ceramic component, reduces the presence of undesired impurities that may adversely affect another part of an apparatus, or both. The addition of the dopant(s) can help to improve the sintering characteristics and density as compared to a sintered ceramic component that includes the material with no dopant and a relatively low impurity content.Type: GrantFiled: March 22, 2017Date of Patent: September 25, 2018Assignees: SAINT-GOBAIN CERAMICS & PLASTICS, INC., SAINT-GOBAIN CENTRE DE RECHERCHE ET D'ETUDES EUROPÉENInventors: Guangyong Lin, Yeshwanth Narendar, Brian C. LaCourse, Wesley R. Robbins, Daniel René Urffer
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Patent number: 9770841Abstract: Embodiments of the present disclosure relate to a hot press and methods of using the hot press. In an embodiment, the hot press can include a pressing element including a flared body. In another embodiment, the hot press can include a compression surface. The compression surface can include a first layer including a monocrystalline material and a second layer including a polycrystalline material, wherein the monocrystalline material and the polycrystalline material include a same primary compound. In a further embodiment, a sample including more than one layer of ceramic oxide material can be hot pressed without a die.Type: GrantFiled: May 20, 2015Date of Patent: September 26, 2017Assignee: SAINT-GOBAIN CERAMICS & PLASTICS, INC.Inventors: Aravind Mohanram, Brian P. Feldman, Yeshwanth Narendar, John D. Pietras, F. Michael Mahoney, Wesley R. Robbins
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Publication number: 20170190624Abstract: A sintered ceramic component can have a final composition including at least 50 wt. % MgO and at least one desired dopant, wherein each dopant of the at least one desired dopant has a desired dopant content of at least 0.1 wt. %. All impurities (not including the desired dopant(s)) are present at a combined impurity content of less than 0.7 wt. %. A remainder can include Al2O3. The selection of dopants can allow for better control over the visual appearance of the sintered ceramic component, reduces the presence of undesired impurities that may adversely affect another part of an apparatus, or both. The addition of the dopant(s) can help to improve the sintering characteristics and density as compared to a sintered ceramic component that includes the material with no dopant and a relatively low impurity content.Type: ApplicationFiled: March 22, 2017Publication date: July 6, 2017Inventors: Guangyong LIN, Yeshwanth NARENDAR, Brian C. LaCourse, Wesley R. ROBBINS, Daniel René URFFER
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Publication number: 20160365586Abstract: A glass-ceramic seal for ionic transport devices such as solid oxide fuel cell stacks or oxygen transport membrane applications. Preferred embodiments of the present invention comprise glass-ceramic sealant material based on a Barium-Aluminum-Silica system, which exhibits a high enough coefficient of thermal expansion to closely match the overall CTE of a SOFC cell/stack (preferably from about 11 to 12.8 ppm/° C.), good sintering behavior, and a very low residual glass phase (which contributes to the stability of the seal).Type: ApplicationFiled: June 7, 2016Publication date: December 15, 2016Inventors: Signo T. Reis, Matthieu Jérôme Schwartz, Morteza Zandi, Yeshwanth Narendar
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Patent number: 9406963Abstract: An interconnect of a solid oxide fuel cell article is disclosed. The interconnect is disposed between a first electrode and a second electrode of the solid oxide fuel cell article. The interconnect comprises a first phase including a ceramic interconnect material and a second phase including partially stabilized zirconia. The partially stabilized zirconia may be in a range of between about 0.1 vol % and about 70 vol % of the total volume of the interconnect.Type: GrantFiled: December 21, 2012Date of Patent: August 2, 2016Assignee: SAINT-GOBAIN CERAMICS & PLASTICS, INC.Inventors: Guangyong Lin, Oh-Hun Kwon, Yeshwanth Narendar
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Publication number: 20160130184Abstract: A sintered ceramic component can have a final composition including at least 50 wt. % MgO and at least one desired dopant, wherein each dopant of the at least one desired dopant has a desired dopant content of at least 0.1 wt. %. All impurities (not including the desired dopant(s)) are present at a combined impurity content of less than 0.7 wt. %. A remainder can include Al2O3. The selection of dopants can allow for better control over the visual appearance of the sintered ceramic component, reduces the presence of undesired impurities that may adversely affect another part of an apparatus, or both. The addition of the dopant(s) can help to improve the sintering characteristics and density as compared to a sintered ceramic component that includes the material with no dopant and a relatively low impurity content.Type: ApplicationFiled: October 30, 2015Publication date: May 12, 2016Inventors: Guangyong LIN, Yeshwanth Narendar, Brian C. Lacourse, Wesley R. Robbins, Daniel René Urffer
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Patent number: 9225024Abstract: An interconnect material is formed by combining a lanthanum-doped strontium titanate with an aliovalent transition metal to form a precursor composition and sintering the precursor composition to form the interconnect material. The aliovalent transition metal can be an electron-acceptor dopant, such as manganese, cobalt, nickel or iron, or the aliovalent transition metal can be an electron-donor dopant, such as niobium or tungsten. A solid oxide fuel cell, or a strontium titanate varistor, or a strontium titanate capacitor can include the interconnect material that includes a lanthanum-doped strontium titanate that is further doped with an aliovalent transition metal.Type: GrantFiled: December 17, 2009Date of Patent: December 29, 2015Assignee: SAINT-GOBAIN CERAMICS & PLASTICS, INC.Inventors: Aravind Mohanram, Yeshwanth Narendar, Guangyong Lin
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Publication number: 20150343663Abstract: Embodiments of the present disclosure relate to a hot press and methods of using the hot press. In an embodiment, the hot press can include a pressing element including a flared body. In another embodiment, the hot press can include a compression surface. The compression surface can include a first layer including a monocrystalline material and a second layer including a polycrystalline material, wherein the monocrystalline material and the polycrystalline material include a same primary compound. In a further embodiment, a sample including more than one layer of ceramic oxide material can be hot pressed without a die.Type: ApplicationFiled: May 20, 2015Publication date: December 3, 2015Inventors: Aravind Mohanram, Brian P. Feldman, Yeshwanth Narendar, John D. Pietras, F. Michael Mahoney, Wesley R. Robbins
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Publication number: 20150079494Abstract: A bonding layer, disposed between an interconnect layer and an electrode layer of a solid oxide fuel cell article, may be formed from a yttria stabilized zirconia (YSZ) powder having a monomodal particle size distribution (PSD) with a d50 that is greater than about 1 ?m and a d90 that is greater than about 2 ?m.Type: ApplicationFiled: November 24, 2014Publication date: March 19, 2015Inventors: Guangyong Lin, Yeshwanth Narendar, John D. Pietras, Qiang Zhao, Robert J. Sliwoski, Caroline Levy, Samuel S. Marlin, Aravind Mohanram
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Patent number: 8968968Abstract: A solid oxide fuel cell includes an anode layer, a cathode layer, and an electrolyte layer partitioning the anode layer and the cathode layer. The anode layer and the cathode layer are of about the same thickness and have about the same coefficient of thermal expansion (CTE).Type: GrantFiled: November 16, 2011Date of Patent: March 3, 2015Assignee: Saint-Gobain Ceramics & Plastics, Inc.Inventors: Yeshwanth Narendar, Oh-Hun Kwon
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Patent number: 8921007Abstract: A bonding layer, disposed between an interconnect layer and an electrode layer of a solid oxide fuel cell article, may be formed from a yttria stabilized zirconia (YSZ) powder having a monomodal particle size distribution (PSD) with a d50 that is greater than about 1 ?m and a d90 that is greater than about 2 ?m.Type: GrantFiled: November 14, 2012Date of Patent: December 30, 2014Assignee: Saint-Gobain Ceramics & Plastics, Inc.Inventors: Guangyong Lin, Yeshwanth Narendar, John D. Pietras, Qiang Zhao, Robert J. Sliwoski, Caroline Levy, Samuel S. Marlin, Aravind Mohanram
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Publication number: 20140295313Abstract: A glass-ceramic seal for ionic transport devices such as solid oxide fuel cell stacks or oxygen transport membrane applications. Preferred embodiments of the present invention comprise glass-ceramic sealant material based on a Barium-Aluminum-Silica system, which exhibits a high enough coefficient of thermal expansion to closely match the overall CTE of a SOFC cell/stack (preferably from about 11 to 12.8 ppm/° C.), good sintering behavior, and a very low residual glass phase (which contributes to the stability of the seal).Type: ApplicationFiled: March 28, 2014Publication date: October 2, 2014Applicant: Saint-Gobain Ceramics & Plastics, Inc.Inventors: Signo Tadeu Reis, Matthieu Schwartz, Morteza Zandi, Yeshwanth Narendar
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Patent number: 8846270Abstract: A solid oxide fuel cell (SOFC) includes a plurality of sub-cells. Each sub-cell includes a first electrode in fluid communication with a source of oxygen gas, a second electrode in fluid communication with a source of a fuel gas, and a solid electrolyte between the first electrode and the second electrode. The SOFC further includes an interconnect between the sub-cells. In one embodiment, the SOFC has a first surface in contact with the first electrode of each sub-cell and a second surface that is in contact with the second electrode of each sub-cell; and the interconnect consists essentially of a doped M-titanate based perovskite, wherein M is an alkaline earth metal. In another embodiment, the interconnect includes a first layer in contact with the first electrode of each sub-cell, and a second layer in contact with the second electrode of each sub-cell. The first layer includes an electrically conductive material selected from the group consisting of an metal, a metal alloy and a mixture thereof.Type: GrantFiled: August 29, 2013Date of Patent: September 30, 2014Assignee: Saint-Gobain Ceramics & Plastics, Inc.Inventor: Yeshwanth Narendar
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Publication number: 20140186647Abstract: A raw material powder for forming a layer of a solid oxide fuel cell (SOFC) article includes a broad particle size distribution (BPSD) defined by plotted curve of frequency versus diameter of the raw material powder may be characterized as having a first standard deviation including at least about 78% to at least about 99% of a total content of particles of the raw material powder. The plotted curve of the BPSD may also be characterized as having a first maximum value and a first minimum value, wherein the difference between the first maximum value and first minimum value is not greater than about 8%.Type: ApplicationFiled: December 16, 2013Publication date: July 3, 2014Applicant: Saint-Gobain Ceramics & Plastics, Inc.Inventors: Aravind MOHANRAM, Yeshwanth NARENDAR, John D. PIETRAS
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Publication number: 20140170531Abstract: The present disclosure relates to solid oxide fuel cells, and particularly raw powder materials which form a layer in a solid oxide fuel. The raw powder materials include an ionic conductor powder material; and an electronic conductor powder material. The ratio of an average particle diameter of the ionic conductor powder material to an average particle diameter of the electronic conductor powder material is greater than about 1:1, and an average particle diameter of at least one of the electronic conductor powder material or the ionic conductor powder material is coarse.Type: ApplicationFiled: December 17, 2013Publication date: June 19, 2014Applicant: Saint-Gobain Ceramics & Plastics, Inc.Inventors: Aravind MOHANRAM, Yeshwanth NARENDAR, Zachary R. PATTERSON, John D. PIETRAS
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Publication number: 20130344412Abstract: A solid oxide fuel cell (SOFC) includes a plurality of sub-cells. Each sub-cell includes a first electrode in fluid communication with a source of oxygen gas, a second electrode in fluid communication with a source of a fuel gas, and a solid electrolyte between the first electrode and the second electrode. The SOFC further includes an interconnect between the sub-cells. In one embodiment, the SOFC has a first surface in contact with the first electrode of each sub-cell and a second surface that is in contact with the second electrode of each sub-cell; and the interconnect consists essentially of a doped M-titanate based perovskite, wherein M is an alkaline earth metal. In another embodiment, the interconnect includes a first layer in contact with the first electrode of each sub-cell, and a second layer in contact with the second electrode of each sub-cell. The first layer includes an electrically conductive material selected from the group consisting of an metal, a metal alloy and a mixture thereof.Type: ApplicationFiled: August 29, 2013Publication date: December 26, 2013Inventor: Yeshwanth Narendar
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Patent number: 8580461Abstract: An anisotropic coefficient of thermal expansion (CTE) cathode of a solid oxide fuel cell (SOFC) is formed by placing a layer of perovskite powder between two platens, and sintering the layer while applying pressure to the platens, thereby forming the anisotropic CTE cathode. The perovskite can be lanthanum strontium manganite (LSM).Type: GrantFiled: August 4, 2011Date of Patent: November 12, 2013Assignee: Saint-Gobain Ceramics & Plastics, Inc.Inventors: F. Michael Mahoney, Yeshwanth Narendar, Hansong Huang
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Publication number: 20130177831Abstract: An interconnect of a solid oxide fuel cell article is disclosed. The interconnect is disposed between a first electrode and a second electrode of the solid oxide fuel cell article. The interconnect comprises a first phase including a ceramic interconnect material and a second phase including partially stabilized zirconia. The partially stabilized zirconia may be in a range of between about 0.1 vol % and about 70 vol % of the total volume of the interconnect.Type: ApplicationFiled: December 21, 2012Publication date: July 11, 2013Inventors: Guangyong LIN, Oh-Hun KWON, Yeshwanth NARENDAR