Patents by Inventor Marappa Rajendran
Marappa Rajendran 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: 11170946Abstract: The present invention provides a supercapacitor assembly which is characterised by comprising: a supercapacitor comprised of carbon-containing anode(s) and cathode(s), intermediate porous membrane(s) and an ionic liquid electrolyte; an electrical heater for heating the supercapacitor; and a thermostat for controlling the heater and maintaining the temperature of the ionic liquid at a temperature such that its viscosity is in the range 1 to 50 centipoise. In particular, there are provided supercapacitors which can operate at voltages greater than 3.5 v (for example, in the range 3.5 to 6 v) without significant long term redox degradation.Type: GrantFiled: May 8, 2019Date of Patent: November 9, 2021Assignee: Oxcion LimitedInventors: Stephen David Voller, Timothy Walder, Marappa Rajendran, Jonathan Tuck
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Patent number: 11164703Abstract: The present invention provides a supercapacitor assembly which is characterised by comprising: a supercapacitor comprised of carbon-containing anode(s) and cathode(s), intermediate porous membrane(s) and an ionic liquid electrolyte; an electrical heater for heating the supercapacitor; and a thermostat for controlling the heater and maintaining the temperature of the ionic liquid at a temperature such that its viscosity is in the range 1 to 50 centipoise. In particular, there are provided supercapacitors which can operate at voltages greater than 3.5v (for example, in the range 3.5 to 6v) without significant long term redox degradation.Type: GrantFiled: March 9, 2017Date of Patent: November 2, 2021Assignee: Oxcion LimitedInventors: Stephen David Voller, Timothy Walder, Marappa Rajendran, Jonathan Tuck
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Patent number: 10931136Abstract: A portable battery-powered electronic device including a battery, a microprocessor and a display screen is provided. The device is characterised in that it further includes an integral rechargeable battery-charging unit connected to the battery comprising: a supercapacitor comprised of one or more sheets of graphene or a graphene-containing material; a power module adapted to provide up to 40 amps to the supercapacitor from a source of alternating current rated at 100 volts or above; an output converter adapted to deliver direct current power from the supercapacitor to the battery; and a control module adapted to control the delivery of the direct current power from the supercapacitor to the battery. Also provided is a device in which an integral rechargeable unit is the sole source of power of the device.Type: GrantFiled: November 22, 2016Date of Patent: February 23, 2021Assignee: Zapgo LtdInventors: Stephen Voller, Marappa Rajendran, Tim Walder
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Patent number: 10490362Abstract: A method of reducing outgassing in a supercapacitor comprised of carbon-containing electrodes and at least one ionic liquid is characterised by the steps of (a) contacting the carbon-containing electrodes with a tetrafluoroborate salt; (b) applying a potential difference across the carbon-containing electrodes whilst in contact with the salt in a cycle during which electrical charge is stored on and discharged from the electrodes; and (c) continuing further cycles of step (b) until such time as substantially no further outgassing from the system occurs.Type: GrantFiled: March 9, 2017Date of Patent: November 26, 2019Assignee: ZapGo LtdInventors: Stephen David Voller, Timothy Walder, Marappa Rajendran
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Publication number: 20190272961Abstract: The present invention provides a supercapacitor assembly which is characterised by comprising: a supercapacitor comprised of carbon-containing anode(s) and cathode(s), intermediate porous membrane(s) and an ionic liquid electrolyte; an electrical heater for heating the supercapacitor; and a thermostat for controlling the heater and maintaining the temperature of the ionic liquid at a temperature such that its viscosity is in the range 1 to 50 centipoise. In particular, there are provided supercapacitors which can operate at voltages greater than 3.5v (for example, in the range 3.5 to 6v) without significant long term redox degradation.Type: ApplicationFiled: May 8, 2019Publication date: September 5, 2019Inventors: Stephen David VOLLER, Timothy WALDER, Marappa RAJENDRAN, Jonathan TUCK
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Publication number: 20170338053Abstract: The present invention provides a supercapacitor assembly which is characterised by comprising: a supercapacitor comprised of carbon-containing anode(s) and cathode(s), intermediate porous membrane(s) and an ionic liquid electrolyte; an electrical heater for heating the supercapacitor; and a thermostat for controlling the heater and maintaining the temperature of the ionic liquid at a temperature such that its viscosity is in the range 1 to 50 centipoise. In particular, there are provided supercapacitors which can operate at voltages greater than 3.5 v (for example, in the range 3.5 to 6 v) without significant long term redox degradation.Type: ApplicationFiled: March 9, 2017Publication date: November 23, 2017Inventors: Stephen David VOLLER, Timothy WALDER, Marappa RAJENDRAN, Jonathan TUCK
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Patent number: 9774201Abstract: A rechargeable battery charger is provided and is characterized by comprising a supercapacitor comprised of one or more sheets of graphene or a graphene-containing material, a power module adapted to provide a current up to 40 amps to the supercapacitor from a source of alternating current rated at 100 volts or above, an output converter adapted to deliver direct current power from the supercapacitor to an output port for connecting to a battery-powered electrical device, and a control module adapted to control various functions of the rechargeable battery charger automatically and/or for managing and regulating a variable output from the supercapacitor. The rechargeable battery charger is especially useful for recharging portable electrical devices such as smartphones, tablets, laptops or similar hand-held or worn items.Type: GrantFiled: November 10, 2015Date of Patent: September 26, 2017Assignee: ZapGo LtdInventors: Stephen Voller, Jonathan R. Tuck, Marappa Rajendran, Ana Trindade, Madhuri Dutta, Nazanin Rashidi, Tim Walder, Quentin LemariƩ
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Publication number: 20170263387Abstract: A method of reducing outgassing in a supercapacitor comprised of carbon-containing electrodes and at least one ionic liquid is characterised by the steps of (a) contacting the carbon-containing electrodes with a tetrafluoroborate salt; (b) applying a potential difference across the carbon-containing electrodes whilst in contact with the salt in a cycle during which electrical charge is stored on and discharged from the electrodes; and (c) continuing further cycles of step (b) until such time as substantially no further outgassing from the system occurs.Type: ApplicationFiled: March 9, 2017Publication date: September 14, 2017Inventors: Stephen David VOLLER, Timothy WALDER, Marappa RAJENDRAN
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Publication number: 20170155265Abstract: A portable battery-powered electronic device including a battery, a microprocessor and a display screen is provided. The device is characterised in that it further includes an integral rechargeable battery-charging unit connected to the battery comprising: a supercapacitor comprised of one or more sheets of graphene or a graphene-containing material; a power module adapted to provide up to 40 amps to the supercapacitor from a source of alternating current rated at 100 volts or above; an output converter adapted to deliver direct current power from the supercapacitor to the battery; and a control module adapted to control the delivery of the direct current power from the supercapacitor to the battery. Also provided is a device in which an integral rechargeable unit is the sole source of power of the device.Type: ApplicationFiled: November 22, 2016Publication date: June 1, 2017Inventors: Stephen VOLLER, Marappa RAJENDRAN, Tim WALDER
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Publication number: 20160141900Abstract: A rechargeable battery charger is provided and is characterised by comprising a supercapacitor comprised of one or more sheets of graphene or a graphene containing material, a power module adapted to provide up to 40 amps to the supercapacitor from a source of alternating current rated at 100 volts or above, an output converter adapted to deliver direct current power from the supercapacitor to an output port for connecting to a battery-powered electrical device, and a control module adapted to control the charger's various functions automatically and/or for managing and regulating a variable output from the supercapacitor. The charger is especially useful for recharging portable electrical devices such as smartphones, tablets, laptops or similar hand-held or worn items.Type: ApplicationFiled: November 10, 2015Publication date: May 19, 2016Inventors: Stephen Voller, Jonathan R. Tuck, Marappa Rajendran, Ana Trindade, Madhuri Dutta, Nazanin Rashidi, Tim Walder, Quentin LemariƩ
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Patent number: D800651Type: GrantFiled: October 2, 2015Date of Patent: October 24, 2017Assignee: ZapGo Ltd.Inventors: Stephen Voller, Jonathan Tuck, Marappa Rajendran, Tim Walder
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Patent number: D859687Type: GrantFiled: July 16, 2017Date of Patent: September 10, 2019Assignee: ZapGo Ltd.Inventors: Stephen Voller, Jonathan Tuck, Marappa Rajendran, Tim Walder