Patents by Inventor Attiganal Narayanaswamy Sreeram
Attiganal Narayanaswamy Sreeram 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: 7037160Abstract: A color cathode-ray tube (CRT) having an evacuated envelope with an electron gun therein for generating at least one electron beam is provided. The envelope further includes a faceplate panel having a luminescent screen with phosphor elements on an interior surface thereof. A focus mask, having a plurality of spaced-apart first conductive strands, is located adjacent to an effective picture area of the screen. The spacing between the first conductive strands defines a plurality of apertures substantially parallel to the phosphor elements on the screen. Each of the first conductive strands has a substantially continuous insulating material layer formed on a screen facing side thereof. A plurality of second conductive wires are oriented substantially perpendicular to the plurality of first conductive strands and are bonded thereto by the insulating material layer. The insulating material layer comprises a low porosity lead-zinc-borosilicate glass.Type: GrantFiled: June 22, 2004Date of Patent: May 2, 2006Assignee: Thomson LicensingInventors: Attiganal Narayanaswamy Sreeram, Leszek Hozer
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Publication number: 20040235386Abstract: A color cathode-ray tube (CRT) having an evacuated envelope with an electron gun therein for generating at least one electron beam is provided. The envelope further includes a faceplate panel having a luminescent screen with phosphor elements on an interior surface thereof. A focus mask, having a plurality of spaced-apart first conductive strands, is located adjacent to an effective picture area of the screen. The spacing between the first conductive strands defines a plurality of apertures substantially parallel to the phosphor elements on the screen. Each of the first conductive strands has a substantially continuous insulating material layer formed on a screen facing side thereof. A plurality of second conductive wires are oriented substantially perpendicular to the plurality of first conductive strands and are bonded thereto by the insulating material layer. The insulating material layer comprises a low porosity lead-zinc-borosilicate glass.Type: ApplicationFiled: June 22, 2004Publication date: November 25, 2004Inventors: Attiganal Narayanaswamy Sreeram, Leszek Hozer
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Patent number: 6784606Abstract: A color cathode-ray tube (CRT) having an evacuated envelope with an electron gun therein for generating at least one electron beam is provided. The envelope further includes a faceplate panel having a luminescent screen with phosphor elements on an interior surface thereof. A focus mask, having a plurality of spaced-apart first conductive strands, is located adjacent to an effective picture area of the screen. The spacing between the first conductive strands defines a plurality of apertures substantially parallel to the phosphor elements on the screen. Each of the first conductive strands has a substantially continuous insulating material layer formed on a screen facing side thereof. A plurality of second conductive wires are oriented substantially perpendicular to the plurality of first conductive lines and are bonded thereto by the insulating material layer. The insulating material layer comprises a low porosity lead-zinc-borosilicate glass.Type: GrantFiled: December 20, 2000Date of Patent: August 31, 2004Assignee: Thomson Licensing S. A.Inventors: Attiganal Narayanaswamy Sreeram, Leszek Hozer
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Patent number: 6690123Abstract: An electron gun as for a cathode ray tube includes a plurality of electrodes biased at different potentials to electrostatically shape and focus the one or more electron beams produced thereby. A dynamic focus grid is driven by a substantial ac voltage signal at the horizontal line rate, which signal is undesirably coupled through parasitic capacitance to an intermediate grid located between the dynamic focus grid and the gun anode. A resistive biasing network includes a high value resistance to divide the anode potential to develop bias potential for the intermediate grid and a capacitance to ac couple the intermediate grid to ground potential. The resistance is formed in a single layer ceramic circuit and the capacitance is formed on the single layer ceramic circuit or on the tube neck. The ceramic circuit may be located in the tube neck on or with the electron gun.Type: GrantFiled: April 28, 2000Date of Patent: February 10, 2004Assignees: Sarnoff Corporation, Samsung Display Devices, Co. LTDInventors: George Herbert Needham Riddle, Roger Casanova Alig, Aly Fathy, Attiganal Narayanaswamy Sreeram, Barry Jay Thaler, Michael James Liberatore
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Patent number: 6551720Abstract: Materials for making a plasma display having a transparent front panel spaced from a back panel which is a metal core having layers of a dielectric material extending over and bonded to the core. The materials of which the back panel is made are chosen to form a back panel having a thermal coefficient of expansion compatible with that of the front panel. The dielectric material is made from a green ceramic tape which is bonded to the core and cofired with the core to form the back panel. The materials for the dielectric can be chosen such that the composite TCE of the cofired assembly matches the TCE of the front panel.Type: GrantFiled: May 2, 2001Date of Patent: April 22, 2003Assignee: Sarnoff CorporationInventors: Attiganal Narayanaswamy Sreeram, Kalipada Palit, Leszek Hozer, Ellen Schwartz Tormey, Michael James Liberatore
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Publication number: 20030039868Abstract: Provided is a battery comprising a first compartment, a second compartment and a barrier separating the first and second compartments, wherein the barrier comprises a proton transporting moiety.Type: ApplicationFiled: August 23, 2002Publication date: February 27, 2003Inventors: Michael James Liberatore, Leszek Hozer, Attiganal Narayanaswamy Sreeram, Rajan Kumar, Chetna Bindra, Zhonghui Hugh Fan
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Patent number: 6500571Abstract: Provided is a fuel cell comprising a first compartment, a second compartment and a barrier separating the first and second compartments, wherein the barrier comprises a proton transporting moiety.Type: GrantFiled: August 18, 1999Date of Patent: December 31, 2002Assignee: PowerZyme, Inc.Inventors: Michael James Liberatore, Leszek Hozer, Attiganal Narayanaswamy Sreeram, Rajan Kumar, Chetna Bindra, Zhonghui Hugh Fan
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Patent number: 6455930Abstract: Integrated packages incorporating multilayer ceramic circuit boards mounted on a metal support substrate can be used for temperature control by the metal support substrate. Various electronic components, as well as additional temperature control devices, can be connected to the circuit boards and to the metal support substrate to control or regulate the temperature of operation of the components. The integrated package can be hermetically sealed with a lid.Type: GrantFiled: September 18, 2000Date of Patent: September 24, 2002Assignee: Lamina Ceramics, Inc.Inventors: Ponnuswamy Palanisamy, Attiganal Narayanaswamy Sreeram, Ellen Schwartz Tormey, Barry Jay Thaler, John Connolly, Ramon Ubaldo Martinelli, Ashok Narayan Prabhu, Mark Stuart Hammond
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Publication number: 20020074923Abstract: A color cathode-ray tube (CRT) having an evacuated envelope with an electron gun therein for generating at least one electron beam is provided. The envelope further includes a faceplate panel having a luminescent screen with phosphor elements on an interior surface thereof. A focus mask, having a plurality of spaced-apart first conductive strands, is located adjacent to an effective picture area of the screen. The spacing between the first conductive strands defines a plurality of apertures substantially parallel to the phosphor elements on the screen. Each of the first conductive strands has a substantially continuous insulating material layer formed on a screen facing side thereof. A plurality of second conductive wires are oriented substantially perpendicular to the plurality of first conductive lines and are bonded thereto by the insulating material layer. The insulating material layer comprises a low porosity lead-zinc-borosilicate glass.Type: ApplicationFiled: December 20, 2000Publication date: June 20, 2002Inventors: Attiganal Narayanaswamy Sreeram, Leszek Hozer
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Patent number: 6361390Abstract: A plasma display device of the type having a composite back plate including a metal substrate and a ceramic barrier rib structure, is formed using a green ceramic tape which is a combination of two glasses, a primary glass which flows back during firing and a secondary glass that has a relatively high thermal coefficient of expansion. These glasses are combined in proportion to match the thermal coefficient of expansion of the metal substrate. Channels are formed on the inner surface of the back panel by laminating a green ceramic tape to the metal substrate and then soaking the laminated tape in a solvent before embossing the green tape to form the ribs. This soaking step enhances the flow of the green ceramic tape during the embossing process. The ceramic components of the green tape are formulated with a particle size 15 &mgr;m or more to enhance particle flow when the green tape is embossed.Type: GrantFiled: September 11, 2000Date of Patent: March 26, 2002Assignee: Sarnoff CorporationInventors: Attiganal Narayanaswamy Sreeram, Ashok Narayan Prabhu, Les Hozer, Kalipada Palit
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Publication number: 20020022565Abstract: Materials for making a plasma display having a transparent front panel spaced from a back panel which is a metal core having layers of a dielectric material extending over and bonded to the core. The materials of which the back panel is made are chosen to form a back panel having a thermal coefficient of expansion compatible with that of the front panel. The dielectric material is made from a green ceramic tape which is bonded to the core and cofired with the core to form the back panel. The materials for the dielectric can be chosen such that the composite TCE of the cofired assembly matches the TCE of the front panel.Type: ApplicationFiled: May 2, 2001Publication date: February 21, 2002Inventors: Attiganal Narayanaswamy Sreeram, Kalipada Palit, Leszek Hozer, Ellen Schwartz Tormey, Michael James Liberatore
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Publication number: 20020001739Abstract: Provided is a battery comprising a first compartment, a second compartment and a barrier separating the first and second compartments, wherein the barrier comprises a proton transporting moiety.Type: ApplicationFiled: August 18, 1999Publication date: January 3, 2002Inventors: MICHAEL JAMES LIBERATORE, LESZEK HOZER, ATTIGANAL NARAYANASWAMY SREERAM, RAJAN KUMAR, CHETNA BINDRA, ZHONGHUI HUGH FAN
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Patent number: 6286204Abstract: An integrated double sided metal supported display device has a green tape stack on both sides of the metal support. The green tape stacks incorporate circuitry and conductor filled vias to access the circuitry electrically on each green tape layer. The metal support has a plurality of openings to access both of the green tape stacks. These openings are made by forming the openings in the metal support, filling them with a dielectric that has a thermal coefficient of expansion close to that of the metal support, forming an opening in the dielectric and filling the opening with a conductive ink.Type: GrantFiled: March 8, 1999Date of Patent: September 11, 2001Assignee: Sarnoff CorporationInventors: Attiganal Narayanaswamy Sreeram, Ashok Narayan Prabhu, Leszek Hozer, Kalipada Palit
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Patent number: 6191934Abstract: High dielectric constant capacitors are made from a dielectric ink of lead-magnesium-niobate and lead oxide powders. Dielectric inks are made by mixing the dielectric powders with a suitable organic vehicle which can be used to coat one or more glass-based green tapes. Buried capacitors are made by coating an overlying and an underlying green tape with a conductor such as silver. Capacitors can also be made by adjusting the organic vehicle and forming a green tape from the dielectric powders. These dielectric green tapes each can be coated with a conductive layer and stacked, the conductive layers connected in parallel. The resultant multilayer capacitors have a very high dielectric constant, while eliminating the need for very large area capacitors, as compared to single layer capacitors.Type: GrantFiled: December 14, 1998Date of Patent: February 20, 2001Assignees: Sarnoff Corporation & Co., Ltd., Daewoo Electronics Co., Ltd.Inventors: Michael James Liberatore, Attiganal Narayanaswamy Sreeram, Ashok Narayan Prabhu, In-Tae Kim, Je-Do Mun, Sung-Dae Park, Yun-Hwi Park, Joo-Dong Yu, Ellen S. Tormey
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Patent number: 6168490Abstract: A plasma display having a transparent front panel spaced from a back panel which is a metal core having layers of a dielectric material extending over and bonded to the core. Conductive electrodes are on the surface of or imbedded in the dielectric layer of the back panel. The materials of which the back panel is made are chosen to form a back panel having a thermal coefficient of expansion compatible with that of the front panel. Barrier ribs are formed on the back panel by embossing the green tape before cofiring the bonded assembly. The green tape is embossed using pulsed pressure and an embossing tool that is formed by assembling embossing members and spacing members in compression. The embossing tool further includes elastic spacers mounted outside of the embossing tool and in a position such that the elastic spacers are held in compression during the embossing operation to aid in releasing the embossed green tape from the embossing tool after the embossing operation.Type: GrantFiled: June 1, 1998Date of Patent: January 2, 2001Assignees: Sarnoff Corporation, LG Electronics, Inc.Inventors: Leszek Hozer, Kalipada Palit, Attiganal Narayanaswamy Sreeram, Robert L. Quinn, Ashok Narayan Prabhu
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Patent number: 6140759Abstract: A plasma display device having a composite back panel including a metal substrate having a predetermined thermal coefficient of expansion (TCE) and a ceramic barrier rib structure which are co-fired at a pre-determined temperature, the ceramic barrier rib structure is composed from a first glass material having a TCE which is less than the TCE of the metal substrate, the first glass formulated to flow-back at the co-firing temperature; and a second glass material having a TCE which is greater than the TCE of the metal substrate, wherein the first and the second glass materials are mixed in a proportion to produce a composite ceramic material having a TCE which is substantially equal to the TCE of the metal substrate. The plasma display device having the ceramic barrier rib structure composed of the first and second glasses provides control of the TCE to minimize stresses in the final produce and assure panel flatness.Type: GrantFiled: July 31, 1998Date of Patent: October 31, 2000Assignee: Sarnoff CorporationInventors: Attiganal Narayanaswamy Sreeram, Ashok Narayan Prabhu, Les Hozer, Kalipada Palit
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Patent number: 6055151Abstract: Embedded passive components such as capacitors are formed in multilayer ceramic circuit boards by screen printing a component precursor compound ink sandwiched between conductor ink layers onto a green tape stack and covering the component ink layer with one or two green tape layers, aligning and laminating the green tapes and firing. Capacitor inks are made from dielectrics chosen from barium titanate, titanium oxide and lead-magnesium-niobate. The green tapes are made of a mixture of a crystallizing glass, a non-crystallizing glass and an oxide filler which does not shrink in the x and y dimensions during firing mounted on a metal support. Thus the embedded components can be made to close tolerances.Type: GrantFiled: February 27, 1998Date of Patent: April 25, 2000Assignees: Sarnoff Corp, Sharp K.K.Inventors: Ellen Schwartz Tormey, Ashok Narayan Prabhu, Attiganal Narayanaswamy Sreeram, Michael James Liberatore
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Patent number: 5953203Abstract: Embedded capacitors are formed in multilayer ceramic circuit boards by screen printing a capacitor ink sandwiched between conductor ink layers onto a green tape stack and covering the ink layer with one or two green tapes, and aligning the green tape layers, and firing. The green tapes are made of a mixture of a crystallizing glass, a non-crystallizing glass and an oxide filler which do not shrink in the x and y dimensions during firing. Thus the capacitors can be made to close tolerances.Type: GrantFiled: March 6, 1997Date of Patent: September 14, 1999Assignees: Sarnoff Corporation, Sharp CorporationInventors: Ellen Schwartz Tormey, Ashok Narayan Prabhu, Attiganal Narayanaswamy Sreeram
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Patent number: 5925203Abstract: A plasma display includes a front panel having a glass body secured to a surface of a substrate. The glass body has a plurality of channels in the exposed surface thereof with upstanding ribs being between the channels. Conductive first electrodes are on the body with each electrode extending along the bottom of a separate channel. The first electrodes are preferably embedded in the glass body. A transparent front panel is over the back panel and is seated on and secured to the glass body. A plurality of spaced, parallel second electrodes extend between the front panel and the back panel substantially orthogonally to the first electrodes. Phosphors which emit different colors are coated on the channels and the channels are filled with a plasma gas.The back panel is formed of at least one and preferably a plurality of layers of a green tape of glass particles in a binder. The layers are stacked one on top of each other and the channels are formed in the surface of one of the layers.Type: GrantFiled: July 1, 1997Date of Patent: July 20, 1999Assignee: Sarnoff CorporationInventors: George Herbert Needham Riddle, Ashok Naryan Prabhu, Dennis Lee Matthies, Attiganal Narayanaswamy Sreeram
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Patent number: 5747931Abstract: A plasma display includes a front panel having a glass body secured to a surface of a substrate. The glass body has a plurality of channels in the exposed surface thereof with upstanding ribs being between the channels. Conductive first electrodes are on the body with each electrode extending along the bottom of a separate channel. The first electrodes are preferably embedded in the glass body. A transparent front panel is over the back panel and is seated on and secured to the glass body. A plurality of spaced, parallel second electrodes extend between the front panel and the back panel substantially orthogonally to the first electrodes. Phosphors which emit different colors are coated on the channels and the channels are filled with a plasma gas. The back panel is formed of at least one and preferably a plurality of layers of a green tape of glass particles in a binder. The layers are stacked one on top of each other and the channels are formed in the surface of one of the layers.Type: GrantFiled: May 24, 1996Date of Patent: May 5, 1998Assignee: David Sarnoff Research Center, Inc.Inventors: George Herbert Needham Riddle, Ashok Naryan Prabhu, Dennis Lee Matthies, Attiganal Narayanaswamy Sreeram