Sayata G Ghose

US Patent:

8508413, Aug 13, 2013

Filed:

Apr 8, 2011

Appl. No.:

13/082839

Inventors:

Kenneth L. Dudley - Newport News VA, US
Holly A. Elliott - Newport News VA, US
Robin L. Cravey - Hampton VA, US
John W. Connell - Yorktown VA, US
Sayata Ghose - Newport News VA, US
Kent A. Watson - New Kent VA, US

Assignee:

The United States of America as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

International Classification:

H01Q 1/38

US Classification:

343700MS

Abstract:

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.

US Patent:

20070292699, Dec 20, 2007

Filed:

Feb 23, 2007

Appl. No.:

11/710386

Inventors:

Kent Watson - New Kent VA, US
Michael Fallbach - Sedalia CO, US
Sayata Ghose - Newport News VA, US
Joseph Smith - Smithfield VA, US
Donavon Delozier - Newport News VA, US
John Connell - Yorktown VA, US

Assignee:

National Institute of Aerospace Associates - Hampton VA
U.S.A. as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

International Classification:

B32B 15/04
B05D 3/00
C09D 1/00

US Classification:

428457000, 106001050, 106001180, 106001190, 106001210, 427561000

Abstract:

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. These articles are well-suited for many applications requiring thermal conductivity, electrical conductivity, antibacterial activity, catalytic activity, and combinations thereof.

US Patent:

20090022977, Jan 22, 2009

Filed:

Jul 16, 2008

Appl. No.:

12/174360

Inventors:

Kenneth L. Dudley - Newport News VA, US
Holly A. Elliott - Newport News VA, US
John W. Connell - Yorktown VA, US
Joseph G. Smith - Smithfield VA, US
Sayata Ghose - Newport News VA, US
Kent A. Watson - New Kent VA, US
Donavon Mark Delozier - Disputanta VA, US

Assignee:

USA as represented by the Administrator of the National Aeronautics and Space Administration - Washington DC

International Classification:

B32B 5/16
C08K 3/08

US Classification:

428323, 428328, 524413

Abstract:

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.

US Patent:

20110256197, Oct 20, 2011

Filed:

Apr 8, 2011

Appl. No.:

13/082734

Inventors:

Robin E. Southward - Stanwood WA, US
Donavon Mark Delozier - Disputanta VA, US
Kent A. Watson - New Kent VA, US
Joseph G. Smith - Smithfield VA, US
Sayata Ghose - Newport News VA, US
John W. Connell - Yorktown VA, US

Assignee:

United States of America as represented by the Administrator of the National Aeronautics and Spac - Washington DC

International Classification:

B05D 5/00
H01B 1/12
H01B 1/20
B01J 21/18
B01J 37/02
B01J 31/06
A01N 25/00
A01N 59/16
C09K 5/00
B01J 37/16
B82Y 40/00
B82Y 30/00

US Classification:

424405, 252 75, 252 76, 25251921, 502182, 502184, 502185, 502159, 424618, 427256, 977748, 977896

Abstract:

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.

US Patent:

20130315816, Nov 28, 2013

Filed:

Apr 1, 2013

Appl. No.:

13/986105

Inventors:

National Institute of Aerospace Associates - , US
Sayata Ghose - Sammamish WA, US
John Connel - Yorktown VA, US

International Classification:

C01B 31/04
C01B 31/00

US Classification:

423448

Abstract:

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 CO, 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.

US Patent:

20230051895, Feb 16, 2023

Filed:

Aug 12, 2021

Appl. No.:

17/401149

Inventors:

- Chicago IL, US
Sayata Ghose - Sammamish WA, US
Brice A. Johnson - Federal Way WA, US
Dustin Fast - Owens Cross Roads AL, US

International Classification:

G06T 7/00
G06T 7/12
G06T 7/33
B32B 41/00
B32B 38/18
B32B 37/06
B32B 37/10
B32B 37/18
B32B 3/14
B32B 3/18
B29C 70/54
B29C 70/34
B29C 73/24

Abstract:

A method of detecting defects in a composite layup includes capturing, using an infrared camera, reference images of a reference layup being laid up by a reference layup head. The method also includes manually reviewing the reference images for defects, and generating reference defect masks indicating defects in the reference images. The method further includes training, using the reference images and reference defect masks, a neural network, creating a machine learning model that, given a production image as input, outputs a production defect mask indicating the defect location and the defect type of each defect. The method also includes capturing, using an infrared camera, production images of a production layup being laid up by the production layup head, and applying the model to the production images to automatically generate a production defect masks indicating each defect in the production images.

US Patent:

20230052563, Feb 16, 2023

Filed:

Aug 12, 2021

Appl. No.:

17/401138

Inventors:

- Chicago IL, US
Brice A. Johnson - Federal Way WA, US
Sayata Ghose - Sammamish WA, US

International Classification:

B29C 70/54
G06T 7/00
G06K 9/00
G01N 25/72
G01J 5/00
B29C 70/30
B29C 70/50

Abstract:

There is provided a method that includes directing one or more infrared cameras at a compaction roller of a composite laying head of a composite layup machine. The one or more infrared cameras are mounted aft of the compaction roller. The method includes applying heat to a substrate by a heater. The heater is mounted forward of the compaction roller. The method further includes using the one or more infrared cameras, to obtain one or more infrared images of the compaction roller, during laying down of one or more composite tows of a composite layup onto the substrate by the compaction roller. The method further includes identifying, based on the one or more infrared images, one or more temperature profiles of the compaction roller, and analyzing identified temperature profiles, to determine one or more of, a layup quality of the composite layup, and a heat history of the composite layup.

US Patent:

20200307124, Oct 1, 2020

Filed:

Mar 25, 2019

Appl. No.:

16/363772

Inventors:

- Chicago IL, US
Sayata Ghose - Sammamish WA, US
Kevin F. Malik - Seattle WA, US

International Classification:

B29C 70/38
B23K 26/0622
B29C 65/16
B29C 65/00
B29B 11/16

Abstract:

An automated fiber-placement method comprises delivering a first quantity of pulsed energy to first portions of at least one fiber-reinforced tape strip, and delivering a second quantity of pulsed energy to second portions of at least the one fiber-reinforced tape strip, alternating with the first portions. Each one of the second portions at least partially overlaps two adjacent ones of the first portions such that overlapping regions of the first portions and the second portions have a higher temperature than non-overlapping regions of the first portions and the second portions. The automated fiber-placement method further comprises laying down at least the one fiber-reinforced tape strip against a substrate along a virtual curvilinear path, such that (i) at least the one fiber-reinforced tape strip is centered on the virtual curvilinear path, and (ii) the overlapping regions are transformed into discrete tape-regions, geometrically different from the overlapping regions.