Patents by Inventor Subramaniam Venkataramani
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: 20110052968Abstract: A battery pack assembly is described. The battery pack assembly includes a plurality of electrochemical cells, wherein the electrochemical cells are isolated from each other by a high temperature electrically insulating coating applied to an outer surface of each electrochemical cell. Methods for providing electrical isolation between individual electrochemical cells are also described.Type: ApplicationFiled: August 28, 2009Publication date: March 3, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Venkat Subramaniam Venkataramani, Mohamed Rahmane
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Publication number: 20110024685Abstract: Crystalline scintillator materials comprising nano-scale particles of metal oxides, metal oxyhalides and metal oxysulfides are provided. The nano-scale particles are less than 100 nm in size. Methods are provided for preparing the particles. In one method, used to form oxyhalides and oxysulfides, metal salts are dissolved in water, and then precipitated out as fine particles using an aqueous base. After the particles are separated from the solution, they are annealed under a flow of a water saturated hydrogen anion gas, such as HCl or H2S, to form the crystalline scintillator particles The other methods take advantage of the characteristics of microemulsion solutions to control droplet size, and, thus, the particle size of the final nano-particles. For example, in one method, a first micro-emulsion containing metal salts if formed. The first micro-emulsion is mixed with an aqueous base in a second micro-emulsion to form the final nano-scale particles.Type: ApplicationFiled: January 21, 2010Publication date: February 3, 2011Applicant: GENERAL ELECTRIC COMPANYInventors: Brent Allen Clothier, Sergio Paulo Martins Loureiro, Alok Srivastava, Stanley John Stoklosa, Steven Jude Duclos, Venkat Subramaniam Venkataramani
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Patent number: 7879284Abstract: A method of making a cubic halide scintillator material includes pressing a powder mixture of cubic halide and at least one activator under conditions of pressure, temperature, residence time and particle size effective to provide a polycrystalline sintered cubic halide scintillator having a pulse height resolution of from about 7% to about 20%. The conditions include a temperature ranging from about ambient temperature up to about 90% of the melting point of the cubic halide, a pressure of from about 30,000 psi to about 200,000 psi, a pressing residence time of from about 5 minutes to about 120 minutes and an average cubic halide particle size of from about 60 micrometers to about 275 micrometers.Type: GrantFiled: January 29, 2007Date of Patent: February 1, 2011Assignee: Momentive Performance Materials Inc.Inventors: Sergio Paulo Martins Loureiro, Venkat Subramaniam Venkataramani, Lucas Clarke, Kevin P. McEvoy, Carl Joshua Vess, Thomas McNulty, Steven Jude Duclos, Adrian Ivan, Patricia A. Hubbard
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Patent number: 7854222Abstract: Heating devices such as self-cleaning ovens include at least one surface comprising metal oxide crystalline catalytic material disposed thereon. The metal oxide crystalline material includes perovskite and perovskite-like materials, pyrochlores, rare earth metal oxides, spinels, and combinations of the foregoing. Also disclosed herein are processes for process for forming a pyrocatalytic coating on a substrate.Type: GrantFiled: June 26, 2008Date of Patent: December 21, 2010Assignee: General Electric CompanyInventors: Venkat Subramaniam Venkataramani, Hrishikesh Keshavan
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Publication number: 20100243946Abstract: A method to make a high resistivity permanent magnetic material comprising a non-conductive phase and a permanent magnetic phase microstructure, is disclosed. The method comprises the steps of, (a) disposing at least one layer comprising a non-conductive powder and at least one layer comprising a permanent magnetic powder adjacent to each other to obtain a multilayer, (b) compressing the multilayer, and (c) sintering the multilayer. A method to make a high resistivity soft magnetic material comprising a microstructure comprising a bulk metallic glass phase and a soft magnetic crystalline metal phase, is also disclosed.Type: ApplicationFiled: March 31, 2009Publication date: September 30, 2010Applicant: GENERAL ELECTRIC COMPANYInventors: Francis Johnson, Ayman Mohamed Fawzi El-Refaie, Lembit Salasoo, Venkat Subramaniam Venkataramani, Thomas Robert Raber
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Patent number: 7800073Abstract: Moldable neutron sensitive compositions containing an inorganic scintillating component, and neutron capture component, and a moldable resin component, are described. They are prepared with optimized compositions for maximized thermal neutron sensitivity. Methods for preparing such compositions, and articles and radiation detectors made from them are described as well.Type: GrantFiled: December 3, 2007Date of Patent: September 21, 2010Assignee: General Electric CompanyInventors: Brent Allen Clothier, Venkat Subramaniam Venkataramani, Sergio Paulo Martins Loureiro, Adrian Ivan
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Publication number: 20100230601Abstract: A polycrystalline scintillator composition is provided. The polycrystalline scintillator composition is capable of being sintered to form a body having a pulse height resolution that is less than about 20 percent at 662 kilo electron volts. Also, an article formed form the polycrystalline scintillator composition is provided, as well as a radiation detector including the article.Type: ApplicationFiled: January 30, 2007Publication date: September 16, 2010Applicant: General Electric CompanyInventors: Sergio Paulo Martins Loureiro, Alok Mani Srivastava, Kevin Paul McEvoy, Venkat Subramaniam Venkataramani, Steven Jude Duclos, James Scott Vartuli, Carl Joshua Vess
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Patent number: 7728499Abstract: Ceramic HID lamps with improved thermal management having an adherent infrared reflective coating layer located on the outer surface of the vessel are described. They include a coating of a nonmetallic material proximate the first and second end portions of the vessel. Such coatings can minimize temperature gradients during lamp operation. Methods for preparing such lamps with improved thermal management are described as well.Type: GrantFiled: November 28, 2007Date of Patent: June 1, 2010Assignee: General Electric CompanyInventors: Preeti Singh, Mohamed Rahmane, Venkat Subramaniam Venkataramani, Balasubramaniam Vaidhyanathan, Gregory Michael Gratson, Sheela Kollali Ramasesha, Mohandas Nayak
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Publication number: 20100117036Abstract: 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: ApplicationFiled: January 21, 2010Publication date: May 13, 2010Applicant: GENERAL ELECTRIC COMPANYInventors: Kalaga Murali Krishna, Venkat Subramaniam Venkataramani, Mohan Manoharan
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Patent number: 7711022Abstract: 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: December 13, 2005Date of Patent: May 4, 2010Assignee: General Electric CompanyInventors: Kalaga Murali Krishna, Venkat Subramaniam Venkataramani, Mohan Manoharan
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Nano-scale metal oxide, oxyhalide and oxysulfide scintillation materials and methods for making same
Patent number: 7708968Abstract: Crystalline scintillator materials comprising nano-scale particles of metal oxides, metal oxyhalides and metal oxysulfides are provided. The nano-scale particles are less than 100 nm in size. Methods are provided for preparing the particles. In one method, used to form oxyhalides and oxysulfides, metal salts are dissolved in water, and then precipitated out as fine particles using an aqueous base. After the particles are separated from the solution, they are annealed under a flow of a water saturated hydrogen anion gas, such as HCl or H2S, to form the crystalline scintillator particles. The other methods take advantage of the characteristics of microemulsion solutions to control droplet size, and, thus, the particle size of the final nano-particles. For example, in one method, a first micro-emulsion containing metal salts if formed. The first micro-emulsion is mixed with an aqueous base in a second micro-emulsion to form the final nano-scale particles.Type: GrantFiled: March 26, 2007Date of Patent: May 4, 2010Assignee: General Electric CompanyInventors: Brent Allen Clothier, Sergio Paulo Martins Loureiro, Alok Srivastava, Stanley John Stoklosa, Steven Jude Duclos, Venkat Subramaniam Venkataramani -
Patent number: 7700003Abstract: A method is provided that includes heating a powder to a temperature that is below the melting point of the scintillator composition but is sufficiently high to form a coherent mass. The powder includes a scintillator composition. The coherent mass is polycrystalline and has a pulse height resolution that is less than 20 percent at 662 kilo electron volts; a light yield of more than 5000 photons per milli electron volt; or both a pulse height resolution that is less than 20 percent at 662 kilo electron volts and a light yield of more than 5000 photons per milli electron. A sintered body is provided also.Type: GrantFiled: January 30, 2007Date of Patent: April 20, 2010Assignee: General Electric CompanyInventors: Sergio Paulo Martins Loureiro, Alok Mani Srivastava, Kevin Paul McEvoy, Venkat Subramaniam Venkataramani, Steven Jude Duclos, James Scott Vartuli, Carl Joshua Vess
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Publication number: 20100059668Abstract: A sintered, annealed scintillator composition, which, prior to annealing, has a formula of A3B2C3O12, where A is at least one member of the group consisting of Tb, Ce, and Lu, or combinations thereof; B is an octahedral site (Al), and C is a tetrahedral site (also Al). One or more substitutions are included. The substitutions may be partial or, in some cases, complete, and can include Al with Sc at B; up to two atoms of oxygen with fluorine and the same number of Ca atoms at A; replacement at B with Mg and the same number of atoms of oxygen with fluorine; replacement at B with a combination of Mg/Si Mg/Zr, Mg/Ti, and/or Mg/Hf; replacement at B with a combination of Li/Nb and/or Li/Ta, and at A with Ca; and replacement of an equal number of B or C with silicon. Related devices are also described, such as CT scanners and well-logging devices.Type: ApplicationFiled: July 13, 2009Publication date: March 11, 2010Inventors: Robert Joseph Lyons, Venkat Subramaniam Venkataramani, Anant Achyut Setlur
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Publication number: 20100027105Abstract: Articles transparent to infrared radiation and resistant to impact and wear are provided. In one embodiment 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 coating and the substrate are capable of transmitting infrared radiation. The composite coating comprises a first phase and a second phase, where 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: ApplicationFiled: June 28, 2007Publication date: February 4, 2010Applicant: 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: 20100018666Abstract: 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: July 25, 2008Publication date: January 28, 2010Applicant: General Electric CompanyInventors: Michael Francis Gigliotti, Shyh-Chin Huang, Adegboyega Masud Makinde, Roger John Petterson, Stephen Francis Rutkowski, Venkat Subramaniam Venkataramani
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Publication number: 20100009177Abstract: 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: ApplicationFiled: July 8, 2008Publication date: January 14, 2010Applicant: GENERAL ELECTRIC COMPANYInventors: Venkat Subramaniam Venkataramani, Salil Mohan Joshi, Nagaveni Karkada, Sundeep Kumar
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Publication number: 20090325782Abstract: Heating devices such as self-cleaning ovens include at least one surface comprising metal oxide crystalline catalytic material disposed thereon. The metal oxide crystalline material includes perovskite and perovskite-like materials, pyrochlores, rare earth metal oxides, spinels, and combinations of the foregoing. Also disclosed herein are processes for process for forming a pyrocatalytic coating on a substrate.Type: ApplicationFiled: June 26, 2008Publication date: December 31, 2009Applicant: GENERAL ELECTRIC COMPANYInventors: Venkat Subramaniam Venkataramani, Hrishikesh Keshavan
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Patent number: 7625502Abstract: Crystalline scintillator materials comprising nano-scale particles of metal halides are provided. The nano-scale particles are less than 100 nm in size. Methods are provided for preparing the particles. In these methods, ionic liquids are used in place of water to allow precipitation of the final product. In one method, the metal precursors and halide salts are dissolved in separate ionic liquids to form solutions, which are then combined to form the nano-crystalline end product. In the other methods, micro-emulsions are formed using ionic liquids to control particle size.Type: GrantFiled: March 26, 2007Date of Patent: December 1, 2009Assignee: General Electric CompanyInventors: Brent Allen Clothier, Sergio Paulo Martins Loureiro, Alok Srivastava, Venkat Subramaniam Venkataramani
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Patent number: 7608829Abstract: A scintillation detector comprising nano-scale particles of a scintillation compound embedded in a plastic matrix is provided. The nano-scale particles may be made from metal oxides, metal oxyhalides, metal oxysulfides, or metal halides. Methods are provided for preparing the nano-scale particles. The particles may be coated with organic compounds or polymers prior to incorporation in the plastic matrix. A technique for matching the refractive index of the plastic matrix with the nano-scale particles by incorporating nano-scale particles of titanium dioxide is also provided. The scintillator may be coupled with one or more photodetectors to form a scintillation detection system. The scintillation detection system may be adapted for use in X-ray and radiation imaging devices, such as digital X-ray imaging, mammography, CT, PET, or SPECT, or may be used in radiation security detectors or subterranean radiation detectors.Type: GrantFiled: March 26, 2007Date of Patent: October 27, 2009Assignee: General Electric CompanyInventors: Sergio Paulo Martins Loureiro, James Scott Vartuli, Brent Allen Clothier, Steven Jude Duclos, Mohan Manoharan, Patrick Roland Lucien Malenfant, Venkat Subramaniam Venkataramani, Clifford Bueno
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Publication number: 20090199392Abstract: A method for fabricating an ultrasound transducer structure is disclosed. The method includes performing the steps of forming a functional layer, including an ultrasound transducer material and a photopolymer, and exposing a plurality of selected regions of the functional layer to a programmable light pattern to cure the selected regions of the functional layer to form polymerized ultrasound transducer material regions, repeatedly. The method further includes selectively removing unexposed regions of the functional layer to obtain a green component, and sintering the green component to obtain the sensing structure. A system for making at least one piezoelectric element is also disclosed.Type: ApplicationFiled: April 1, 2008Publication date: August 13, 2009Applicant: GENERAL ELECTRIC COMPANYInventors: Prabhjot Singh, Martin Kin-Fei Lee, James Anthony Brewer, Paul Aloysius Meyer, Thomas James Batzinger, Venkat Subramaniam Venkataramani, James Norman Barshinger, Ernest Wayne Balch