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).

  • Publication number: 20220302438
    Abstract: 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: Application
    Filed: June 7, 2022
    Publication date: September 22, 2022
    Inventors: Rajshekar DAS GUPTA, Elmira MEMARZADEH, Sankar DAS GUPTA, Bjorn Haugseter, Tom Henriksen, Lars Ole Valøen, Akhilesh Kumar Srivastava
  • Patent number: 11355744
    Abstract: 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: Grant
    Filed: February 28, 2019
    Date of Patent: June 7, 2022
    Assignee: ELECTROVAYA INC.
    Inventors: Rajshekar Das Gupta, Elmira Memarzadeh, Sankar Das Gupta, Bjorn Haugseter, Tom Henriksen, Lars Ole Valøen, Akhilesh Kumar Srivastava
  • Patent number: 10797277
    Abstract: 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: Grant
    Filed: November 17, 2017
    Date of Patent: October 6, 2020
    Assignee: ELECTROVAYA INC.
    Inventors: Rakesh Bhola, Rajshekar Das Gupta, Sankar Das Gupta
  • Publication number: 20190267616
    Abstract: 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: Application
    Filed: February 28, 2019
    Publication date: August 29, 2019
    Inventors: Rajshekar DAS GUPTA, Elmira MEMARZADEH, Sankar DAS GUPTA, Bjorn Haugseter, Tom Henriksen, Lars Ole Valøen, Akhilesh Kumar Srivastava
  • Publication number: 20180114956
    Abstract: 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: Application
    Filed: November 17, 2017
    Publication date: April 26, 2018
    Inventors: Rakesh BHOLA, Rajshekar DAS GUPTA, Sankar DAS GUPTA
  • Patent number: 9853254
    Abstract: 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: Grant
    Filed: January 7, 2013
    Date of Patent: December 26, 2017
    Assignee: ELECTROVAYA INC.
    Inventors: Rakesh Bhola, Rajshekar Das Gupta, Sankar Das Gupta
  • Publication number: 20140363721
    Abstract: 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: Application
    Filed: January 7, 2013
    Publication date: December 11, 2014
    Applicant: ELECTROVAYA INC.
    Inventors: Rakesh Bhola, Rajshekar Das Gupta, Sankar Das Gupta
  • Patent number: 5096858
    Abstract: 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: Grant
    Filed: March 12, 1991
    Date of Patent: March 17, 1992
    Assignee: The University of British Columbia
    Inventors: Asoke C. Das Chaklader, Sankar Das Gupta
  • Patent number: 5011799
    Abstract: 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: Grant
    Filed: September 14, 1990
    Date of Patent: April 30, 1991
    Inventors: Asoke C. Das Chaklander, Sankar Das Gupta
  • Patent number: 4986887
    Abstract: 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: Grant
    Filed: March 31, 1989
    Date of Patent: January 22, 1991
    Inventors: Sankar Das Gupta, James K. Jacobs
  • Patent number: 4470892
    Abstract: 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: Grant
    Filed: December 30, 1981
    Date of Patent: September 11, 1984
    Assignee: HSA Reactors Limited
    Inventors: Sankar Das Gupta, James K. Jacobs, Samaresh Mohanta
  • Patent number: 4326938
    Abstract: 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: Grant
    Filed: December 3, 1979
    Date of Patent: April 27, 1982
    Assignee: HSA Reactors Limited
    Inventors: Sankar Das Gupta, James K. Jacobs, Samaresh Mohanta
  • Patent number: 4308122
    Abstract: 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: Grant
    Filed: December 4, 1979
    Date of Patent: December 29, 1981
    Assignee: HSA Reactors Limited
    Inventors: Sankar Das Gupta, James K. Jacobs, Samaresh Mohanta
  • Patent number: 4108755
    Abstract: 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: Grant
    Filed: June 27, 1977
    Date of Patent: August 22, 1978
    Assignee: Ontario Limited
    Inventors: Bernard Fleet, Sankar Das Gupta
  • Patent number: 4108757
    Abstract: 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: Grant
    Filed: June 27, 1977
    Date of Patent: August 22, 1978
    Assignee: 308489 Ontario Limited
    Inventors: Bernard Fleet, Sankar Das Gupta
  • Patent number: 4108754
    Abstract: 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: Grant
    Filed: June 27, 1977
    Date of Patent: August 22, 1978
    Assignee: Ontario Limited
    Inventors: Bernard Fleet, Sankar Das Gupta
  • Patent number: 4046664
    Abstract: 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: Grant
    Filed: July 28, 1975
    Date of Patent: September 6, 1977
    Assignee: 308489 Ontario Limited
    Inventors: Bernard Fleet, Sankar Das Gupta
  • Patent number: 4046663
    Abstract: 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: Grant
    Filed: July 28, 1975
    Date of Patent: September 6, 1977
    Assignee: 308489 Ontario Limited
    Inventors: Bernard Fleet, Sankar Das Gupta