Patents by Inventor Sankar Das Gupta
Sankar Das 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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Publication number: 20220302438Abstract: The present disclosure relates generally to an electrode produced with a non-toxic solvent, resulting in a homogeneous mixture with uniform distributions of a conductive additive and a binder. Electrodes produced according to the present disclosure feature narrow binder particle size distribution, which distinguishes such electrodes from typical electrodes produced via a N-Methyl-Pyrrolidone (NMP) process. The resulting microstructure promotes the flow of current through the electrode and has an improved cycling stability due, in part, to the binder's and the conductive additive's ability to bind with the active material particles used in the fabrication of the electrode.Type: ApplicationFiled: June 7, 2022Publication date: September 22, 2022Inventors: Rajshekar DAS GUPTA, Elmira MEMARZADEH, Sankar DAS GUPTA, Bjorn Haugseter, Tom Henriksen, Lars Ole Valøen, Akhilesh Kumar Srivastava
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Patent number: 11355744Abstract: The present disclosure relates generally to an electrode produced with a non-toxic solvent, resulting in a homogeneous mixture with uniform distributions of a conductive additive and a binder. Electrodes produced according to the present disclosure feature narrow binder particle size distribution, which distinguishes such electrodes from typical electrodes produced via a N-Methyl-Pyrrolidone (NMP) process. The resulting microstructure promotes the flow of current through the electrode and has an improved cycling stability due, in part, to the binder's and the conductive additive's ability to bind with the active material particles used in the fabrication of the electrode.Type: GrantFiled: February 28, 2019Date of Patent: June 7, 2022Assignee: ELECTROVAYA INC.Inventors: Rajshekar Das Gupta, Elmira Memarzadeh, Sankar Das Gupta, Bjorn Haugseter, Tom Henriksen, Lars Ole Valøen, Akhilesh Kumar Srivastava
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Patent number: 10797277Abstract: A double-sealed thin film electrochemical pouch cell, comprising a cathode current collector, a cathode, an electrolyte, an anode, and an anode current collector, which is double-sealed by a first inner laminate layer forming a primary seal covered by a second outer polymer layer forming a secondary seal The second outer polymer layer comprises embedded particles to increase the thermal conductivity of the second outer polymer layer.Type: GrantFiled: November 17, 2017Date of Patent: October 6, 2020Assignee: ELECTROVAYA INC.Inventors: Rakesh Bhola, Rajshekar Das Gupta, Sankar Das Gupta
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Publication number: 20190267616Abstract: The present disclosure relates generally to an electrode produced with a non-toxic solvent, resulting in a homogeneous mixture with uniform distributions of a conductive additive and a binder. Electrodes produced according to the present disclosure feature narrow binder particle size distribution, which distinguishes such electrodes from typical electrodes produced via a N-Methyl-Pyrrolidone (NMP) process. The resulting microstructure promotes the flow of current through the electrode and has an improved cycling stability due, in part, to the binder's and the conductive additive's ability to bind with the active material particles used in the fabrication of the electrode.Type: ApplicationFiled: February 28, 2019Publication date: August 29, 2019Inventors: Rajshekar DAS GUPTA, Elmira MEMARZADEH, Sankar DAS GUPTA, Bjorn Haugseter, Tom Henriksen, Lars Ole Valøen, Akhilesh Kumar Srivastava
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Publication number: 20180114956Abstract: A double-sealed thin film electrochemical pouch cell, comprising a cathode current collector, a cathode, an electrolyte, an anode, and an anode current collector, which is double-sealed by a first inner laminate layer forming a primary seal covered by a second outer polymer layer forming a secondary seal The second outer polymer layer comprises embedded particles to increase the thermal conductivity of the second outer polymer layer.Type: ApplicationFiled: November 17, 2017Publication date: April 26, 2018Inventors: Rakesh BHOLA, Rajshekar DAS GUPTA, Sankar DAS GUPTA
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Patent number: 9853254Abstract: A double-sealed thin film electrochemical pouch cell, comprising a cathode current collector, a cathode, an electrolyte, an anode, and an anode current collector, which is double-sealed by a first inner laminate layer forming a primary seal covered by a second outer polymer layer forming a secondary seal. The second outer polymer layer comprises embedded particles to increase the thermal conductivity of the second outer polymer layer.Type: GrantFiled: January 7, 2013Date of Patent: December 26, 2017Assignee: ELECTROVAYA INC.Inventors: Rakesh Bhola, Rajshekar Das Gupta, Sankar Das Gupta
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Publication number: 20140363721Abstract: A double-sealed thin film electrochemical pouch cell, comprising a cathode current collector, a cathode, an electrolyte, an anode, and an anode current collector, which is double-sealed by a first inner laminate layer forming a primary seal covered by a second outer polymer layer forming a secondary seal. The second outer polymer layer comprises embedded particles to increase the thermal conductivity of the second outer polymer layer.Type: ApplicationFiled: January 7, 2013Publication date: December 11, 2014Applicant: ELECTROVAYA INC.Inventors: Rakesh Bhola, Rajshekar Das Gupta, Sankar Das Gupta
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Patent number: 5096858Abstract: A method of producing ceramic composites of Al.sub.2 O.sub.3 reinforced by shaped SiC particles preferably shaped as fine particles (random), platelets, whiskers or fibres by in situ production of SiC particles by heating a mixture of carbon particles of the desired shape with silicates of Al.sub.2 O.sub.3 to a temperature above 1500.degree. C., convert the silicates and carbon to Al.sub.2 O.sub.3 and SiC to produce in situ SiC particles of the desired shape and provide a ceramic powder that may be densified by techniques such as hot pressing, isostatic pressing or sintering.Type: GrantFiled: March 12, 1991Date of Patent: March 17, 1992Assignee: The University of British ColumbiaInventors: Asoke C. Das Chaklader, Sankar Das Gupta
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Patent number: 5011799Abstract: A method of producing ceramic composites of Al.sub.2 O.sub.3 reinforced by shaped SiC particles preferably shaped as fine particles (random), platelets, whiskers or fibres by in situ production of SiC particles by heating a mixture of carbon particles of the desired shape with silicates of Al.sub.2 O.sub.3 to a temperature above 1500.degree. C., convert the silicates and carbon to Al.sub.2 O.sub.3 and SiC to produce in situ SiC particles of the desired shape and provide a ceramic powder that may be densified by techniques such as hot pressing, isostatic pressing or sintering.Type: GrantFiled: September 14, 1990Date of Patent: April 30, 1991Inventors: Asoke C. Das Chaklander, Sankar Das Gupta
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Patent number: 4986887Abstract: A process is described wherein hydrogen and its isotopes are dissolved in palladium metal in high density by utilizing electrochemical methods in an electrolytic cell. The cell has an inert anode and a palladium containing cathode, both being immersed in an electrolyte which contains a lithium salt dissolved in an aprotic solvent, and a small amount of water. The dissolved hydrogen to palladium ratio in the palladium bearing cathode, which may be achieved by this process, is in excess of 0.95.Type: GrantFiled: March 31, 1989Date of Patent: January 22, 1991Inventors: Sankar Das Gupta, James K. Jacobs
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Patent number: 4470892Abstract: Electrodes are disclosed which comprise a porous conductive material as a primary electrode component in electrical contact with a secondary electrode component which preferably is a metal, such as titanium. The secondary electrode component is normally conductive when operating as a cathode, and is capable of alternating between being non-conductive when operating as an anode and becoming conductive again when the electrode is operating as a cathode. Processes for removing metallic species from solution utilizing such electrodes are also disclosed.Type: GrantFiled: December 30, 1981Date of Patent: September 11, 1984Assignee: HSA Reactors LimitedInventors: Sankar Das Gupta, James K. Jacobs, Samaresh Mohanta
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Patent number: 4326938Abstract: Electrodes are disclosed which comprise a porous conductive material as a primary electrode component in electrical contact with a secondary electrode component which preferably is a metal, such as titanium. The secondary electrode component is normally conductive when operating as a cathode, and is capable of alternating between being non-conductive when operating as an anode and becoming conductive again when the electrode is operating as a cathode. Processes for removing metallic species from solution utilizing such electrodes are also disclosed.Type: GrantFiled: December 3, 1979Date of Patent: April 27, 1982Assignee: HSA Reactors LimitedInventors: Sankar Das Gupta, James K. Jacobs, Samaresh Mohanta
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Patent number: 4308122Abstract: Apparatus usable in the electrolytic treatment of electroactive species in a solution include a porous electrode which is supported across a fluid flow path in such a manner that fluid flowing along the flow path must pass through an effective portion of the electrode.Type: GrantFiled: December 4, 1979Date of Patent: December 29, 1981Assignee: HSA Reactors LimitedInventors: Sankar Das Gupta, James K. Jacobs, Samaresh Mohanta
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Patent number: 4108755Abstract: The invention provides an electrode for use in an electrochemical reactor. The electrode comprising a plurality of metallic filaments consisting of carbon fibers coated with a metal, each of the metallic filaments being in electrical contact with at least several of the other metallic filaments for transmitting an electrical potential substantially throughout the electrode when the electrode is in use in the reactor.Type: GrantFiled: June 27, 1977Date of Patent: August 22, 1978Assignee: Ontario LimitedInventors: Bernard Fleet, Sankar Das Gupta
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Patent number: 4108757Abstract: The invention provides an electrode for use in an electrochemical reactor. The electrode comprising a plurality of carbon fibers in close proximity to one another, each of the fibers being in electrical contact with at least several of the other carbon fibers for transmitting an electrical potential substantially throughout the electrode when the electrode is in use in the reactor.Type: GrantFiled: June 27, 1977Date of Patent: August 22, 1978Assignee: 308489 Ontario LimitedInventors: Bernard Fleet, Sankar Das Gupta
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Patent number: 4108754Abstract: The invention provides an electrode for use in an electrochemical reactor. The electrode comprising a plurality of carbon fibers in close proximity to one another, each of the fibers being in electrical contact with at least several of the other carbon fibers for transmitting an electrical potential substantially throughout the electrode when the electrode is in use in the reactor.Type: GrantFiled: June 27, 1977Date of Patent: August 22, 1978Assignee: Ontario LimitedInventors: Bernard Fleet, Sankar Das Gupta
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Patent number: 4046664Abstract: The invention provides an electrode for use in an electrochemical reactor. The electrode comprising a plurality of metallic filaments consisting of carbon fibers coated with a metal, each of the metallic filaments being in electrical contact with at least several of the other metallic filaments for transmitting an electrical potential substantially throughout the electrode when the electrode is in use in the reactor.Type: GrantFiled: July 28, 1975Date of Patent: September 6, 1977Assignee: 308489 Ontario LimitedInventors: Bernard Fleet, Sankar Das Gupta
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Patent number: 4046663Abstract: The invention provides an electrode for use in an electrochemical reactor. The electrode comprising a plurality of carbon fibers in close proximity to one another, each of the fibers being in electrical contact with at least several of the other carbon fibers for transmitting an electrical potential substantially throughout the electrode when the electrode is in use in the reactor.Type: GrantFiled: July 28, 1975Date of Patent: September 6, 1977Assignee: 308489 Ontario LimitedInventors: Bernard Fleet, Sankar Das Gupta