Patents by Inventor Sayata Ghose
Sayata Ghose 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: 20190383759Abstract: An infrared camera is directed aft of a compaction roller of a composite laying head. Heat is applied to a substrate by a heater mounted forward of the compaction roller. Infrared images are captured of composite tows laid down on a substrate by the compaction roller. Whether the composite tows have sufficient contact is determined using the infrared images.Type: ApplicationFiled: June 14, 2018Publication date: December 19, 2019Inventors: Brice A. Johnson, Sayata Ghose, Tyler M. Holmes, Hong Hue Tat, Gary Ernest Georgeson
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Publication number: 20190193345Abstract: Systems and methods are provided for dynamically managing heater position for an Automated Fiber Placement (AFP) machine. One embodiment is a method that includes retrieving distance data indicating predicted distances of a heating surface of a heater of the AFP machine to a surface of a laminate being laid-up by the AFP machine, for each of multiple locations along a path. The method also includes directing the AFP machine to lay up the laminate in accordance with a Numerical Control (NC) program, identifying a current location of the heater in the path, determining a speed at which the heater of the AFP machine is moving, correlating the current location of the heater with a predicted distance, and adjusting an amount of power for the heater at the current location based on the predicted distance that was correlated with the current location, and the speed at the current location.Type: ApplicationFiled: February 27, 2019Publication date: June 27, 2019Inventors: Jeron D. Moore, Brice A. Johnson, Samuel F. Pedigo, Sayata Ghose
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Patent number: 10252478Abstract: Systems and methods are provided for dynamically managing heater position for an Automated Fiber Placement (AFP) machine. One embodiment is a method that includes retrieving distance data indicating predicted distances of a heating surface of a heater of the AFP machine to a surface of a laminate being laid-up by the AFP machine, for each of multiple locations along a path. The method also includes directing the AFP machine to lay up the laminate in accordance with a Numerical Control (NC) program, identifying a current location of the heater in the path, determining a speed at which the heater of the AFP machine is moving, correlating the current location of the heater with a predicted distance, and adjusting an amount of power for the heater at the current location based on the predicted distance that was correlated with the current location, and the speed at the current location.Type: GrantFiled: September 8, 2016Date of Patent: April 9, 2019Assignee: The Boeing CompanyInventors: Jeron D Moore, Brice A Johnson, Samuel F Pedigo, Sayata Ghose
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Publication number: 20190061282Abstract: Closed-loop systems and methods for controlling the temperature at the compaction point as an automated fiber placement (AFP) machine is placing material over complex surface features at varying speeds. The closed-loop system starts with multiple infrared temperature sensors directed at the layup surface in front of the compaction roller and also at the new layup surface behind the compaction roller. These sensors supply direct temperature readings to a control computer, which also receives speed data and a listing of active tows from the AFP machine and is also programmed with the number of plies in the current layup. In accordance with one embodiment, the heater control system uses a proportional-integral-derivative loop to control the temperature at the compaction point (e.g., at the interface of the compaction roller and a newly laid tow) and regulate the heater power to achieve the desired temperature.Type: ApplicationFiled: August 29, 2017Publication date: February 28, 2019Applicant: The Boeing CompanyInventors: Brice A. Johnson, Samuel F. Pedigo, Sayata Ghose, John Z. Lin
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Publication number: 20180065325Abstract: Systems and methods are provided for dynamically managing heater position for an Automated Fiber Placement (AFP) machine. One embodiment is a method that includes retrieving distance data indicating predicted distances of a heating surface of a heater of the AFP machine to a surface of a laminate being laid-up by the AFP machine, for each of multiple locations along a path. The method also includes directing the AFP machine to lay up the laminate in accordance with a Numerical Control (NC) program, identifying a current location of the heater in the path, determining a speed at which the heater of the AFP machine is moving, correlating the current location of the heater with a predicted distance, and adjusting an amount of power for the heater at the current location based on the predicted distance that was correlated with the current location, and the speed at the current location.Type: ApplicationFiled: September 8, 2016Publication date: March 8, 2018Inventors: Jeron D. Moore, Brice A. Johnson, Samuel F. Pedigo, Sayata Ghose
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Patent number: 9475973Abstract: In the method of embodiments of the invention, the metal seeded carbon allotropes are reacted in solution forming zero valent metallic nanowires at the seeded sites. A polymeric passivating reagent, which selects for anisotropic growth is also used in the reaction to facilitate nanowire formation. The resulting structure resembles a porcupine, where carbon allotropes have metallic wires of nanometer dimensions that emanate from the seed sites on the carbon allotrope. These sites are populated by nanowires having approximately the same diameter as the starting nanoparticle diameter.Type: GrantFiled: March 26, 2014Date of Patent: October 25, 2016Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Robin E. Southward, Donavon Mark Delozier, Kent A. Watson, Joseph G. Smith, Jr., Sayata Ghose, John W. Connell
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Patent number: 9238334Abstract: A method and apparatus for forming a stack of composite layers into a desired shape is present. The stack of composite layers may be positioned on a tool and a number of compressible supports such that the stack of composite layers may be substantially flat on the tool and the stack of composite layers may be substantially flat on the number of compressible supports. A flexible sheet may be placed on top of the stack of composite layers. A vacuum load may be applied on the stack of composite layers on the tool and the number of compressible supports using the flexible sheet such that consolidation of the stack of composite layers occurs to form a desired shape on the tool and the number of compressible supports compress during forming of the desired shape.Type: GrantFiled: July 20, 2015Date of Patent: January 19, 2016Assignee: THE BOEING COMPANYInventors: William Thomas Kline, Larry Earl Gross, Sayata Ghose
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Publication number: 20150321428Abstract: A method and apparatus for forming a stack of composite layers into a desired shape is present. The stack of composite layers may be positioned on a tool and a number of compressible supports such that the stack of composite layers may be substantially flat on the tool and the stack of composite layers may be substantially flat on the number of compressible supports. A flexible sheet may be placed on top of the stack of composite layers. A vacuum load may be applied on the stack of composite layers on the tool and the number of compressible supports using the flexible sheet such that consolidation of the stack of composite layers occurs to form a desired shape on the tool and the number of compressible supports compress during forming of the desired shape.Type: ApplicationFiled: July 20, 2015Publication date: November 12, 2015Inventors: William Thomas Kline, Larry Earl Gross, Sayata Ghose
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Patent number: 9120677Abstract: A scalable method allows preparation of bulk quantities of holey carbon allotropes with holes ranging from a few to over 100 nm in diameter. Carbon oxidation catalyst nanoparticles are first deposited onto a carbon allotrope surface in a facile, controllable, and solvent-free process. The catalyst-loaded carbons are then subjected to thermal treatment in air. The carbons in contact with the carbon oxidation catalyst nanoparticles are selectively oxidized into gaseous byproducts such as CO or CO2, leaving the surface with holes. The catalyst is then removed via refluxing in diluted nitric acid to obtain the final holey carbon allotropes. The average size of the holes correlates strongly with the size of the catalyst nanoparticles and is controlled by adjusting the catalyst precursor concentration. The temperature and time of the air oxidation step, and the catalyst removal treatment conditions, strongly affect the morphology of the holes.Type: GrantFiled: April 1, 2013Date of Patent: September 1, 2015Assignees: National Institute of Aerospace Associates, The United States of America as represented by the Administration of NASAInventors: Kent Watson, Yi Lin, Sayata Ghose, John Connell
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Patent number: 9120275Abstract: A method and apparatus for forming a stack of composite layers into a desired shape is present. The stack of composite layers may be positioned on a tool and a number of compressible supports such that the stack of composite layers may be substantially flat on the tool and the stack of composite layers may be substantially flat on the number of compressible supports. A flexible sheet may be placed on top of the stack of composite layers. A vacuum load may be applied on the stack of composite layers on the tool and the number of compressible supports using the flexible sheet such that consolidation of the stack of composite layers occurs to form a desired shape on the tool and the number of compressible supports compress during forming of the desired shape.Type: GrantFiled: October 30, 2012Date of Patent: September 1, 2015Assignee: THE BOEING COMPANYInventors: William Thomas Kline, Larry Earl Gross, Sayata Ghose
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Patent number: 8790773Abstract: A dielectric material includes a network of nanosubstrates, such as but not limited to nanotubes, nanosheets, or other nanomaterials or nanostructures, a polymer base material or matrix, and nanoparticles constructed at least partially of an elemental metal. The network has a predetermined nanosubstrate loading percentage by weight with respect to a total weight of the dielectric material, and a preferential or predetermined longitudinal alignment with respect to an orientation of an incident electrical field. A method of forming the dielectric material includes depositing the metal-based nanoparticles onto the nanosubstrates and subsequently mixing these with a polymer matrix. Once mixed, alignment can be achieved by melt extrusion or a similar mechanical shearing process. Alignment of the nanosubstrate may be in horizontal or vertical direction with respect to the orientation of an incident electrical field.Type: GrantFiled: July 16, 2008Date of Patent: July 29, 2014Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Kenneth L. Dudley, Holly A Elliott, John W. Connell, Joseph G. Smith, Sayata Ghose, Kent A. Watson, Donavon Mark Delozier
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Publication number: 20140203206Abstract: In the method of embodiments of the invention, the metal seeded carbon allotropes are reacted in solution forming zero valent metallic nanowires at the seeded sites. A polymeric passivating reagent, which selects for anisotropic growth is also used in the reaction to facilitate nanowire formation. The resulting structure resembles a porcupine, where carbon allotropes have metallic wires of nanometer dimensions that emanate from the seed sites on the carbon allotrope. These sites are populated by nanowires having approximately the same diameter as the starting nanoparticle diameter.Type: ApplicationFiled: March 26, 2014Publication date: July 24, 2014Inventors: Robin E. Southward, Donavon Mark Delozier, Kent A. Watson, Joseph G. Smith, JR., Sayata Ghose, John W. Connell
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Patent number: 8703235Abstract: In the method of embodiments of the invention, the metal seeded carbon allotropes are reacted in solution forming zero valent metallic nanowires at the seeded sites. A polymeric passivating reagent, which selects for anisotropic growth is also used in the reaction to facilitate nanowire formation. The resulting structure resembles a porcupine, where carbon allotropes have metallic wires of nanometer dimensions that emanate from the seed sites on the carbon allotrope. These sites are populated by nanowires having approximately the same diameter as the starting nanoparticle diameter.Type: GrantFiled: April 8, 2011Date of Patent: April 22, 2014Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Robin E. Southward, Donavon Mark Delozier, Kent A. Watson, Joseph G. Smith, Sayata Ghose, John W. Connell
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Patent number: 8508413Abstract: An antenna includes a ground plane, a dielectric disposed on the ground plane, and an electrically-conductive radiator disposed on the dielectric. The dielectric includes at least one layer of a first dielectric material and a second dielectric material that collectively define a dielectric geometric pattern, which may comprise a fractal geometry. The radiator defines a radiator geometric pattern, and the dielectric geometric pattern is geometrically identical, or substantially geometrically identical, to the radiator geometric pattern.Type: GrantFiled: April 8, 2011Date of Patent: August 13, 2013Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Kenneth L. Dudley, Holly A. Elliott, Robin L. Cravey, John W. Connell, Sayata Ghose, Kent A. Watson, Joseph G. Smith, Jr.
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Publication number: 20110256197Abstract: In the method of embodiments of the invention, the metal seeded carbon allotropes are reacted in solution forming zero valent metallic nanowires at the seeded sites. A polymeric passivating reagent, which selects for anisotropic growth is also used in the reaction to facilitate nanowire formation. The resulting structure resembles a porcupine, where carbon allotropes have metallic wires of nanometer dimensions that emanate from the seed sites on the carbon allotrope. These sites are populated by nanowires having approximately the same diameter as the starting nanoparticle diameter.Type: ApplicationFiled: April 8, 2011Publication date: October 20, 2011Applicant: United States of America as represented by the Administrator of the National Aeronautics and SpacInventors: Robin E. Southward, Donavon Mark Delozier, Kent A. Watson, Joseph G. Smith, Sayata Ghose, John W. Connell
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Publication number: 20110254739Abstract: An antenna includes a ground plane, a dielectric disposed on the ground plane, and an electrically-conductive radiator disposed on the dielectric. The dielectric includes at least one layer of a first dielectric material and a second dielectric material that collectively define a dielectric geometric pattern, which may comprise a fractal geometry. The radiator defines a radiator geometric pattern, and the dielectric geometric pattern is geometrically identical, or substantially geometrically identical, to the radiator geometric pattern.Type: ApplicationFiled: April 8, 2011Publication date: October 20, 2011Applicant: U. S. A. as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Kenneth L. DUDLEY, Holly A. ELLIOTT, Robin L. CRAVEY, John W. CONNELL, Sayata GHOSE, Kent A. WATSON, Joseph G. SMITH
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Patent number: 7704553Abstract: A process for depositing nanometer-sized metal particles onto a substrate in the absence of aqueous solvents, organic solvents, and reducing agents, and without any required pre-treatment of the substrate, includes preparing an admixture of a metal compound and a substrate by dry mixing a chosen amount of the metal compound with a chosen amount of the substrate; and supplying energy to the admixture in an amount sufficient to deposit zero valance metal particles onto the substrate. This process gives rise to a number of deposited metallic particle sizes which may be controlled. The compositions prepared by this process are used to produce polymer composites by combining them with readily available commodity and engineering plastics. The polymer composites are used as coatings, or they are used to fabricate articles, such as free-standing films, fibers, fabrics, foams, molded and laminated articles, tubes, adhesives, and fiber reinforced articles.Type: GrantFiled: February 23, 2007Date of Patent: April 27, 2010Assignees: National Institute of Aerospace Associates, The United States of America as represented by the Administrator of NASAInventors: Kent A. Watson, Michael J. Fallbach, Sayata Ghose, Joseph G. Smith, Donavon M. Delozier, John W. Connell
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Publication number: 20090022977Abstract: A dielectric material includes a network of nanosubstrates, such as but not limited to nanotubes, nanosheets, or other nanomaterials or nanostructures, a polymer base material or matrix, and nanoparticles constructed at least partially of an elemental metal. The network has a predetermined nanosubstrate loading percentage by weight with respect to a total weight of the dielectric material, and a preferential or predetermined longitudinal alignment with respect to an orientation of an incident electrical field. A method of forming the dielectric material includes depositing the metal-based nanoparticles onto the nanosubstrates and subsequently mixing these with a polymer matrix. Once mixed, alignment can be achieved by melt extrusion or a similar mechanical shearing process. Alignment of the nanosubstrate may be in horizontal or vertical direction with respect to the orientation of an incident electrical field.Type: ApplicationFiled: July 16, 2008Publication date: January 22, 2009Applicant: USA as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Kenneth L. Dudley, Holly A. Elliott, John W. Connell, Joseph G. Smith, Sayata Ghose, Kent A. Watson, Donavon Mark Delozier
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Publication number: 20070292699Abstract: A process for depositing nanometer-sized metal particles onto a substrate in the absence of aqueous solvents, organic solvents, and reducing agents, and without any required pretreatment of the substrate, includes preparing an admixture of a metal compound and a substrate by dry mixing a chosen amount of the metal compound with a chosen amount of the substrate; and supplying energy to the admixture in an amount sufficient to deposit zero valance metal particles onto the substrate. This process gives rise to a number of deposited metallic particle sizes which may be controlled. The compositions prepared by this process are used to produce polymer composites by combining them with readily available commodity and engineering plastics. The polymer composites are used as coatings, or they are used to fabricate articles, such as free-standing films, fibers, fabrics, foams, molded and laminated articles, tubes, adhesives, and fiber reinforced articles.Type: ApplicationFiled: February 23, 2007Publication date: December 20, 2007Applicants: National Institute of Aerospace Associates, U.S.A. as represented by the Administrator of the National Aeronautics and Space AdministrationInventors: Kent Watson, Michael Fallbach, Sayata Ghose, Joseph Smith, Donavon Delozier, John Connell