Patents by Inventor Tarkeshwar Gupta
Tarkeshwar Gupta 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: 9309274Abstract: A device is presented having reversibly changeable and optically readable optical properties. The device comprises a substrate having an electrically conductive surface and carrying a redox-active layer structure. The redox-active layer structure may be a monolayer or a multi-layer structure and is configured to have at least one predetermined electronic property including at least one of electrodensity and oxidation state. The electronic property of the layer structure defines an optical property of the structure thereby determining an optical response of the structure to certain incident light. This at least one electronic property is changeable by subjecting the redox-active layer structure to an electric field or to a redox-active material. The device thus enables effecting a change in said electronic property that results in a detectable change in the optical response of the layer structure.Type: GrantFiled: September 17, 2014Date of Patent: April 12, 2016Assignee: YEDA RESEARCH AND DEVELOPMENT CO. LTD.Inventors: Milko E. Van Der Boom, Atindra D. Shukla, David Rosenblatt, Tarkeshwar Gupta
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Publication number: 20150007371Abstract: A device is presented having reversibly changeable and optically readable optical properties. The device comprises a substrate having an electrically conductive surface and carrying a redox-active layer structure. The redox-active layer structure may be a monolayer or a multi-layer structure and is configured to have at least one predetermined electronic property including at least one of electrodensity and oxidation state. The electronic property of the layer structure defines an optical property of the structure thereby determining an optical response of the structure to certain incident light. This at least one electronic property is changeable by subjecting the redox-active layer structure to an electric field or to a redox-active material. The device thus enables effecting a change in said electronic property that results in a detectable change in the optical response of the layer structure.Type: ApplicationFiled: September 17, 2014Publication date: January 1, 2015Inventors: Milko E. VAN DER BOOM, Atindra D. SHUKLA, David ROSENBLATT, Tarkeshwar GUPTA
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Publication number: 20140196180Abstract: A device is presented having reversibly changeable and optically readable optical properties. The device comprises a substrate having an electrically conductive surface and carrying a redox-active layer structure. The redox-active layer structure may be a monolayer or a multi-layer structure and is configured to have at least one predetermined electronic property including at least one of electrodensity and oxidation state. The electronic property of the layer structure defines an optical property of the structure thereby determining an optical response of the structure to certain incident light. This at least one electronic property is changeable by subjecting the redox-active layer structure to an electric field or to a redox-active material. The device thus enables effecting a change in said electronic property that results in a detectable change in the optical response of the layer structure.Type: ApplicationFiled: January 16, 2014Publication date: July 10, 2014Applicant: YEDA RESEARCH & DEVELOPMENT COMPANY LTD.Inventors: Milko E. VAN DER BOOM, Atindra D. Shukla, David Rosenblatt, Tarkeshwar Gupta
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Patent number: 8722879Abstract: A device is presented having reversibly changeable and optically readable optical properties. The device comprises a substrate having an electrically conductive surface and carrying a redox-active layer structure. The redox-active layer structure may be a monolayer or a multi-layer structure and is configured to have at least one predetermined electronic property including at least one of electrodensity and oxidation state. The electronic property of the layer structure defines an optical property of the structure thereby determining an optical response of the structure to certain incident light. This at least one electronic property is changeable by subjecting the redox-active layer structure to an electric field or to a redox-active material. The device thus enables effecting a change in said electronic property that results in a detectable change in the optical response of the layer structure.Type: GrantFiled: March 5, 2007Date of Patent: May 13, 2014Assignee: Yeda Research & Development Company Ltd. at the Weizmann Institute of ScienceInventors: Milko E. Van Der Boom, Atindra D. Shukla, David Rosenblatt, Tarkeshwar Gupta
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Patent number: 8273576Abstract: The present invention relates to a molecular-based system for the optical detection, quantification and detoxification of hexavalent chromium (Cr6+) by reversible metal-substrate electron transfer. More particularly, the invention provides a Cr6+ sensor device comprising a divalent osmium (Os2+)-, iron (Fe2+)- or ruthenium (R2+)-based pyridyl complex capable of changing its oxidation state in response to a reduction of Cr6+ at the presence of H+, thereby causing a reversible and optically readable change in optical properties of said complex. The Os2+-, Fe2+- or R2+-based pyridyl complex used according to the invention can be used for selective detection and quantification of Cr6+, as well as for catalytic detoxification of Cr6+.Type: GrantFiled: February 1, 2009Date of Patent: September 25, 2012Assignee: Yeda Research and Development Co., Ltd.Inventors: Milko E. Van Der Boom, Tarkeshwar Gupta, Graham De Ruiter
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Publication number: 20110059536Abstract: The present invention relates to a molecular-based system for the optical detection, quantification and detoxification of hexavalent chromium (Cr6+) by reversible metal-substrate electron transfer. More particularly, the invention provides a Cr6+ sensor device comprising a divalent osmium (Os2+)-, iron (Fe2+)- or ruthenium (R2+)-based pyridyl complex capable of changing its oxidation state in response to a reduction of Cr6+ at the presence of H+, thereby causing a reversible and optically readable change in optical properties of said complex. The Os2+-, Fe2+- or R2+-based pyridyl complex used according to the invention can be used for selective detection and quantification of Cr6+, as well as for catalytic detoxification of Cr6+.Type: ApplicationFiled: February 1, 2009Publication date: March 10, 2011Applicant: YEDA RESEARCH AND DEVELOPMENT CO., LTD.Inventors: Milko E. Van Der Boom, Tarkeshwar Gupta, Graham De Ruiter
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Publication number: 20070258147Abstract: A device is presented having reversibly changeable and optically readable optical properties. The device comprises a substrate having an electrically conductive surface and carrying a redox-active layer structure. The redox-active layer structure may be a monolayer or a multi-layer structure and is configured to have at least one predetermined electronic property including at least one of electrodensity and oxidation state. The electronic property of the layer structure defines an optical property of the structure thereby determining an optical response of the structure to certain incident light. This at least one electronic property is changeable by subjecting the redox-active layer structure to an electric field or to a redox-active material. The device thus enables effecting a change in said electronic property that results in a detectable change in the optical response of the layer structure.Type: ApplicationFiled: March 5, 2007Publication date: November 8, 2007Applicant: Yeda Research & Development Co., Ltd.Inventors: Milko Van Der Boom, Atindra Shukla, David Rosenblatt, Tarkeshwar Gupta