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: 20080011953Abstract: A scintillator composition is provided. The scintillator composition may include a matrix having at least one lanthanide ion and at least one halide ion, and a dopant. The dopant may include a trivalent cerium activator ion disposed in the matrix, and a trivalent bismuth activator ion disposed in the matrix.Type: ApplicationFiled: July 11, 2006Publication date: January 17, 2008Applicant: General Electric CompanyInventors: Alok Mani Srivastava, Holly Ann Comanzo, Venkat Subramaniam Venkataramani
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Patent number: 7310405Abstract: A scintillator pack comprises an array of scintillator pixels and an x-ray absorbing layer disposed in inter-scintillator regions between the scintillator pixels. The x-ray absorbing layer acts to absorb x-rays and protect underlying regions of the inter-scintillator regions. The x-ray absorbing layer may be formed by a number of methods including casting and melt infiltration.Type: GrantFiled: September 27, 2002Date of Patent: December 18, 2007Assignee: General Electric CompanyInventors: Venkat Subramaniam Venkataramani, Steven Jude Duclos
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Patent number: 7297037Abstract: A ceramic discharge chamber for a lamp, according to an exemplary embodiment of the invention, comprises a first member which includes a leg portion and a transition portion, wherein the leg portion and the transition portion are integrally formed as one piece from a ceramic material, and a second member which includes a body portion, wherein the body portion is bonded to the transition portion of the first member. The ceramic discharge chamber can be formed by injection molding a ceramic material to form the first member, the first member forming a first portion of the ceramic discharge chamber; and bonding the first member to a second member which forms a second portion of the ceramic discharge chamber.Type: GrantFiled: June 18, 2004Date of Patent: November 20, 2007Assignee: General Electric CompanyInventors: Venkat Subramaniam Venkataramani, Charles David Greskovich, Curtis Edward Scott, James Anthony Brewer
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Publication number: 20070221132Abstract: A processing apparatus for use in a corrosive operating environment at a temperature range of 25-1500° C. is provided. The apparatus has an NZP or an NZP-type coating, which comprises a first composition, a second composition, and a metal cation. The first composition and the second composition form a crystalline structure with three-dimensional network of octahedra and tetrahedra linked by one or more shared atoms. The first composition comprises one or more of Zr, V, Ta, Nb, Hf, Ti, Al, Cr, or a metal of the Lanthanide series. The second composition comprises at least one of phosphorus, silicon, boron, vanadium or aluminum. The one or more shared atoms comprise at least one of oxygen, nitrogen, or carbon. The first composition and the second composition are related as shown by the formula (first composition)2 (second composition)x (shared atom)12-x. The metal cation is disposed within an interstitial site defined by the crystalline structure.Type: ApplicationFiled: November 27, 2006Publication date: September 27, 2007Applicant: General Electric CompanyInventors: Ramachandran Gopi Chandran, Balasubramaniam Vaidhyanathan, Venkat Subramaniam Venkataramani, Victor Lienkong Lou, George Theodore Dalakos, Sheela Kollali Ramasesha
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Publication number: 20070224451Abstract: A composition is provided that is capable of forming an NZP or an NZP-type coating. The composition includes a first composition, a second composition, and a metal cation. The first composition and the second composition form a crystalline structure with three-dimensional network of octahedra and tetrahedra linked by one or more shared atoms. The first composition comprises one or more of Zr, V, Ta, Nb, Hf, Ti, Al, Cr, or a metal of the Lanthanide series. The second composition comprises at least one of phosphorus, silicon, boron, vanadium or aluminum. The one or more shared atoms comprise at least one of oxygen, nitrogen, or carbon. The first composition and the second composition are related as shown by the formula (first composition)2 (second composition)x (shared atom)12?x. The metal cation is disposed within an interstitial site defined by the crystalline structure.Type: ApplicationFiled: August 11, 2006Publication date: September 27, 2007Applicant: General Electric CompanyInventors: Ramachandran Gopi Chandran, Balasubramaniam Vaidhyanathan, Venkat Subramaniam Venkataramani, Victor Lienkong Lou, George Theodore Dalakos, Sheela Kollali Ramasesha
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Patent number: 7252789Abstract: A scintillator composition comprising a garnet represented by (M1-x-yNxAy)3(Al5-a-bCaDb)O12, where M comprises yttrium, or terbium, or gadolinium, or holmium, or erbium, or thulium, or ytterbium, or lutetium, or combinations thereof, where N comprises additives including a lanthanide, or an alkali metal, or an alkaline earth metal, or combinations thereof, where A comprises a suitable activator ion including cerium, or europium, or praseodymium, or terbium, or ytterbium, or combinations thereof, where C or D comprises lithium, or magnesium, or gallium, or an element from group IIIa, or IVa, or Va, or IIId transition metal, or IVd transition metal, or combinations thereof, where x ranges from about 0 to about 0.90, y ranges from about 0.0005 to about 0.30, and a sum of a and b ranges from about 0 to 2.0.Type: GrantFiled: March 31, 2005Date of Patent: August 7, 2007Assignee: General Electric CompanyInventors: Venkat Subramaniam Venkataramani, Steven Jude Duclos
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Patent number: 7141794Abstract: A scintillator composition of a halide perovskite material of at least one ABX3 type halide perovskite, at least one activator for the matrix material and optionally at least one charge compensator to assist the incorporation of the activator in the perovskite lattice and any reaction products thereof. Radiation detectors that use the scintillators are also described, as are related methods for detecting high-energy radiation and method of producing an activated halide-perovskite based scintillator crystal.Type: GrantFiled: June 28, 2004Date of Patent: November 28, 2006Assignee: General Electric CompanyInventors: Alok Mani Srivastava, Steven Jude Duclos, Holly Ann Comanzo, Venkat Subramaniam Venkataramani, Venkatesan Manivannan
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Patent number: 7138901Abstract: A system having a heat source, a component coupled to the heat source, and at least one thermistor coupled to the component and adapted to monitor temperature of the component, wherein the thermistor has a core-shell microstructure having a shell disposed about a core, the core comprising Cr2O3 and the shell comprising a rare earth element compound.Type: GrantFiled: March 30, 2004Date of Patent: November 21, 2006Assignee: General Electric CompanyInventors: Hari Nadathur Seshadri, Venkat Subramaniam Venkataramani, Amitabh Verma, Geetha Karavoor, David Joseph Sorg
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Patent number: 7098460Abstract: A conversion device for use in an imaging system is provided. The conversion device includes a first perforated plate portion forming a plurality of collimator channels separated by a plurality of thin collimator walls. A second perforated plate portion forming a plurality of scintillator channels separated by a plurality of thin scintillator walls is attached to the first perforated plate portion. A reflective coating is applied to the inside scintillator surface of the plurality of thin scintillator walls. A scintillator material is filled into the plurality of scintillator channels.Type: GrantFiled: August 4, 2003Date of Patent: August 29, 2006Assignee: General Electric CompanyInventors: Robert Joseph Lyons, Martin Kin-Fei Lee, Venkat Subramaniam Venkataramani, Clifford Bueno, James Walter LeBlanc, James Scott Vartuli, Charles David Greskovich, Stephen F. Bancheri
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Patent number: 6982126Abstract: A thermal barrier coating (TBC) for a component intended for use in a hostile thermal environment. The TBC has an interior region and an outer surface region on and contacting the interior region. Both regions are formed of a ceramic material, with the interior region having a lower thermal conductivity than zirconia partially stabilized by about seven weight percent yttria. The interior region constitutes more than half of the thickness of the TBC, and the outer surface region constitutes less than half of the thickness of the TBC. The TBC has a columnar microstructure whereby the interior region and the outer surface region comprise columns of their ceramic materials. The outer surface region is more erosion and impact resistant than the interior region at least in part as a result of the columns thereof being more closely spaced than the columns of the interior region.Type: GrantFiled: November 26, 2003Date of Patent: January 3, 2006Assignee: General Electric CompanyInventors: Ramgopal Darolia, Irene Spitsberg, Brett Allen Rohrer Boutwell, Mark Daniel Gorman, Curtis Alan Johnson, Venkat Subramaniam Venkataramani
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Patent number: 6936009Abstract: A matching layer for ultrasound transducers has a gradient in impedance value from one surface to the other surface of the matching layer. The matching layer is composed of a plurality of sublayers made of composite materials and securely attached together and is disposed on the surface of the transducer element. The first sublayer adjacent to the transducer element has an impedance value less than or equal to that of the transducer element. The last sublayer adjacent to the target has an impedance value greater than or equal to that of the target. The impedance values of the sublayers decrease monotonically from the first to the last sublayer.Type: GrantFiled: February 27, 2001Date of Patent: August 30, 2005Assignee: General Electric CompanyInventors: Venkat Subramaniam Venkataramani, Lionel Monty Levinson, Lowell Scott Smith
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Patent number: 6887588Abstract: An article protected by a thermal barrier coating system includes a substrate having a substrate surface, and a thermal barrier coating system overlying the substrate. The thermal barrier coating system has a thermal barrier coating formed of a thermal barrier coating material arranged as a plurality of columnar grains extending generally perpendicular to the substrate surface and having grain surfaces. A sintering inhibitor is within the columnar grains, either uniformly distributed or concentrated at the grain surfaces. The sintering inhibitor is lanthanum oxide, chromium oxide, and/or yttrium chromate, mixtures thereof, or mixtures thereof with aluminum oxide.Type: GrantFiled: September 21, 2001Date of Patent: May 3, 2005Assignee: General Electric CompanyInventors: John Frederick Ackerman, Venkat Subramaniam Venkataramani, Irene Spitsberg, Ramgopal Darolia
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Publication number: 20040265621Abstract: Acicular bodies of a metal compound are produced by slowly precipitating an organic salt of the metal from a solution of an ester of a dicarboxylic acid having 1-5 carbon atoms and firing the precipitate in an oxidizing atmosphere. These acicular bodies have a cross-sectional dimension less than about 20 &mgr;m and are useful for providing reinforcement of a larger ceramic body. Acicular bodies of rare-earth metal oxides also are useful in reinforcing x-ray scintillator bodies without diminishing their luminescent capacity.Type: ApplicationFiled: May 10, 2004Publication date: December 30, 2004Inventors: James Scott Vartuli, Venkat Subramaniam Venkataramani
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Publication number: 20040256994Abstract: A ceramic discharge chamber for a lamp, according to an exemplary embodiment of the invention, comprises a first member which includes a leg portion and a transition portion, wherein the leg portion and the transition portion are integrally formed as one piece from a ceramic material, and a second member which includes a body portion, wherein the body portion is bonded to the transition portion of the first member. The ceramic discharge chamber can be formed by injection molding a ceramic material to form the first member, the first member forming a first portion of the ceramic discharge chamber; and bonding the first member to a second member which forms a second portion of the ceramic discharge chamber. The members which form the ceramic discharge chamber can greatly facilitate assembly of the discharge chamber, because the discharge chamber can be constructed with only one or two bonds between the members.Type: ApplicationFiled: June 18, 2004Publication date: December 23, 2004Inventors: Venkat Subramaniam Venkataramani, Charles David Greskovich, Curtis Edward Scott, James Anthony Brewer
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Patent number: 6822374Abstract: An ultrasound transducer element incorporates material of low dielectric constant to confine the electric field of a stack of piezoelectric ceramic layers. Edge segments made of material having a low dielectric constant and extending in the thickness direction are formed at opposing ends of the multilayer structure. These regions of low dielectric constant material confine the electric field to the piezoelectric ceramic material of high dielectric constant, where it remains directed vertically. In this way, when a voltage is applied between the electrodes, the piezoelectrically induced strains are almost entirely vertical. Spurious modes are therefore substantially reduced.Type: GrantFiled: November 15, 2000Date of Patent: November 23, 2004Assignee: General Electric CompanyInventors: Lowell Scott Smith, Douglas Glenn Wildes, Venkat Subramaniam Venkataramani
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Patent number: 6815648Abstract: A glass-ceramic cooktop appliance having at least one burner assembly disposed under a glass-ceramic plate. The cooktop appliance includes a sensor assembly having a support bar mounted on the burner assembly adjacent to the glass-ceramic plate and one or more devices for sensing cooktop related properties mounted on the support bar so as to be in contact with the glass-ceramic plate.Type: GrantFiled: December 31, 2002Date of Patent: November 9, 2004Assignee: General Electric CompanyInventors: Vivek V. Badami, Venkat Subramaniam Venkataramani, Emilie Thorbjorg Saulnier, Ertugrul Berkcan
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Patent number: 6811760Abstract: Acicular bodies of a metal compound are produced by slowly precipitating an organic salt of the metal from a solution of an ester of a dicarboxylic acid having 1-5 carbon atoms and firing the precipitate in an oxidizing atmosphere. These acicular bodies have a cross-sectional dimension less than about 20 &mgr;m and are useful for providing reinforcement of a larger ceramic body. Acicular bodies of rare-earth metal oxides also are useful in reinforcing x-ray scintillator bodies without diminishing their luminescent capacity.Type: GrantFiled: March 30, 2001Date of Patent: November 2, 2004Assignee: General Electric CompanyInventors: James Scott Vartuli, Venkat Subramaniam Venkataramani
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Patent number: 6791266Abstract: A ceramic discharge chamber for a lamp, according to an exemplary embodiment of the invention, comprises a first member which includes a leg portion and a transition portion, wherein the leg portion and the transition portion are integrally formed as one piece from a ceramic material, and a second member which includes a body portion, wherein the body portion is bonded to the transition portion of the first member. The ceramic discharge chamber can be formed by injection molding a ceramic material to form the first member, the first member forming a first portion of the ceramic discharge chamber; and bonding the first member to a second member which forms a second portion of the ceramic discharge chamber. The members which form the ceramic discharge chamber can greatly facilitate assembly of the discharge chamber, because the discharge chamber can be constructed with only one or two bonds between the members.Type: GrantFiled: April 7, 2003Date of Patent: September 14, 2004Assignee: General Electric CompanyInventors: Venkat Subramaniam Venkataramani, Charles David Greskovich, Curtis Edward Scott, James Anthony Brewer
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Publication number: 20040164067Abstract: A glass-ceramic cooktop appliance having at least one burner assembly disposed under a glass-ceramic plate. The cooktop appliance includes a sensor assembly having a support bar mounted on the burner assembly adjacent to the glass-ceramic plate and one or more devices for sensing cooktop related properties mounted on the support bar so as to be in contact with the glass-ceramic plate.Type: ApplicationFiled: December 31, 2002Publication date: August 26, 2004Applicant: General Electric CompanyInventors: Vivek V. Badami, Venkat Subramaniam Venkataramani, Emilie Thorbjorg Saulnier, Ertugrul Berkcan
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Patent number: 6706212Abstract: Cerium-doped alkaline-earth hafnium oxide scintillator compositions have at least one alkaline earth metal selected from the group consisting of Ba, Sr, Ca, and combinations thereof. The scintillator compositions can be formed into a shape having porosity less than about 0.05 percent for improved transparency. The alkaline earth metal can be partially substituted with divalent and/or trivalent ions other than cerium. Hafnium can be partially substituted with divalent, trivalent, and/or tetravalent ions. The scintillators are characterized by high light output, short decay time, and high radiation stopping power. The scintillators can be used as detector elements in PET systems.Type: GrantFiled: April 12, 2002Date of Patent: March 16, 2004Assignee: General Electric CompanyInventors: Venkat Subramaniam Venkataramani, Sergio Martins Loureiro, Manisha Vishwanath Rane