Patents by Inventor Gehan Amaratunga

Gehan Amaratunga 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).

  • Patent number: 10336619
    Abstract: Graphene oxide is synthesized by chemical treatment of graphite using only H2SO4, KMnO4, H2O2 and/or H2O as reagents. Graphene oxide films obtained using the method disclosed herein were characterized using various analytical techniques. These analytical techniques confirmed the creation of single to few layer graphene oxide with relatively large lateral size distribution using the method disclosed herein.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: July 2, 2019
    Assignee: Sri Lanka Institute of Nanotechnology (PVT) Ltd.
    Inventors: Viraj C. Jayawardena, Dilushan Rukmal Jayasundara, Gehan Amaratunga, Vimukthi Jayaweera
  • Patent number: 10316391
    Abstract: Disclosed herein is a novel approach to the chemical synthesis of titanium metal from a titanium oxide source material. In the approach described herein, a titanium oxide source is reacted with Mg vapor to extract a pure Ti metal. The method disclosed herein is more scalable, cheaper, faster, and safer than prior art methods.
    Type: Grant
    Filed: August 2, 2016
    Date of Patent: June 11, 2019
    Assignee: Sri Lanka Institute of Nanotechnology (PVT) Ltd.
    Inventors: Gayani Abayaweera, Gehan Amaratunga, Niranjala Fernando, Veranja Karunaratne, Nilwala Kottegoda, Ruwini Ekanayake
  • Publication number: 20180223393
    Abstract: Disclosed herein is a novel approach to the chemical synthesis of titanium metal from a titanium oxide source material, such as a mineral comprising titanium. In the approach described herein, a titanium oxide source is reacted with Mg vapor to extract a pure Ti metal. The method disclosed herein is more scalable, cheaper, faster, and safer than prior art methods.
    Type: Application
    Filed: April 6, 2018
    Publication date: August 9, 2018
    Inventors: GAYANI ABAYAWEERA, Gehan Amaratunga, Niranjala Fernando, Veranja Karunaratne, Nilwala Kottegoda, Ruwini Ekanayake
  • Publication number: 20180211793
    Abstract: The invention provides a method for preparing a carbon composite, the method comprising the step of heating a mixture of graphene oxide and an active material, such as a carbon active material, such as activated carbon, at a temperature in the range 200 to 650° C., such as about 300° C. Also provided is the carbon composite obtained or obtainable from the method. The carbon composition may be provided on a backing plate, such as an electrically conductive backing plate. The carbon composite may be a component, such as the electrode, of a capacitor, such as a supercapacitor, and also provided are methods for charging and discharging the supercapacitor comprising the carbon composite.
    Type: Application
    Filed: July 29, 2016
    Publication date: July 26, 2018
    Inventors: Dona Galhena, Gehan Amaratunga, Stephan Hofmann
  • Publication number: 20180037974
    Abstract: Disclosed herein is a novel approach to the chemical synthesis of titanium metal from a titanium oxide source material. In the approach described herein, a titanium oxide source is reacted with Mg vapour to extract a pure Ti metal. The method disclosed herein is more scalable, cheaper, faster, and safer than prior art methods.
    Type: Application
    Filed: August 2, 2016
    Publication date: February 8, 2018
    Inventors: GAYANI ABAYAWEERA, Gehan Amaratunga, Niranjala Fernando, Veranja Karunaratne, Nilwala Kottegoda, Ruwini Ekanayake
  • Publication number: 20180029887
    Abstract: Graphene oxide is synthesized by chemical treatment of graphite using only H2SO4, KMnO4, H2O2 and/or H2O as reagents. Graphene oxide films obtained using the method disclosed herein were characterized using various analytical techniques. These analytical techniques confirmed the creation of single to few layer graphene oxide with relatively large lateral size distribution using the method disclosed herein.
    Type: Application
    Filed: July 27, 2016
    Publication date: February 1, 2018
    Inventors: VIRAJ C. JAYAWARDENA, DILUSHAN RUKMAL JAYASUNDARA, GEHAN AMARATUNGA, VIMUKTHI JAYAWEERA
  • Patent number: 9786444
    Abstract: An electrical energy storage device structure comprises a first conductive sheet, a second conductive sheet and an electrolyte sheet placed between the first conductive sheet and the second conductive sheet. In the device, at least one of the first conductive sheet and the second conductive sheet comprises a layer of carbon nanoparticles. The carbon nanoparticle layer is arranged to be adjacent to the electrolyte sheet. The carbon nanoparticles may include both high aspect ratio carbon nanoparticles and low aspect ratio carbon nanoparticles. The device is flexible and at least partially transparent.
    Type: Grant
    Filed: June 25, 2009
    Date of Patent: October 10, 2017
    Assignee: Nokia Technologies Oy
    Inventors: Pritesh Hiralal, Husnu Emrah Unalan, Haolan Wang, Gehan Amaratunga, Di Wei, Markku Antti Kyosti Rouvala
  • Patent number: 9406985
    Abstract: An energy storage device structure comprises a first electrode layer, an electrolyte layer and a second electrode layer. At least one of the electrode layers comprise a metallic base layer, a layer of carbon nanotubes grown on the base layer and a layer of carbon nanoparticles disposed on the carbon nanotube layer, the carbon nanoparticle layer being arranged to face the electrolyte layer. The structure has much larger width and length than thickness, so it is rolled up or folded and then hermetically sealed to form an energy storage unit. The layer of carbon nanotubes is grown on the metallic base layer by a chemical vapor deposition process at a temperature no higher than 550° C. The carbon nanotubes in the carbon nanotube layer are at least partially aligned in a direction that is perpendicular to the surface of the metallic base layer.
    Type: Grant
    Filed: January 13, 2009
    Date of Patent: August 2, 2016
    Assignee: Nokia Technologies Oy
    Inventors: Gehan Amaratunga, Haolan Wang, Husnu Emrah Unalan, Markku Antti Kyosti Rouvala, Di Wei
  • Patent number: 9251966
    Abstract: An apparatus, the apparatus including first and second circuit boards, and an electrolyte, the first and second circuit boards each including a capacitive element, wherein the apparatus is configured such that a chamber is defined between the first and second circuit boards with the capacitive elements contained therein and facing one another, the chamber including the electrolyte, and wherein the apparatus is configured to store electrical charge when a potential difference is applied between the capacitive elements.
    Type: Grant
    Filed: July 30, 2015
    Date of Patent: February 2, 2016
    Assignee: Nokia Technologies Oy
    Inventors: Markku Rouvala, Yinglin Liu, Piers Andrew, Pritesh Hiralal, Haolan Wang, Gehan Amaratunga
  • Publication number: 20150332867
    Abstract: An apparatus, the apparatus including first and second circuit boards, and an electrolyte, the first and second circuit boards each including a capacitive element, wherein the apparatus is configured such that a chamber is defined between the first and second circuit boards with the capacitive elements contained therein and facing one another, the chamber including the electrolyte, and wherein the apparatus is configured to store electrical charge when a potential difference is applied between the capacitive elements.
    Type: Application
    Filed: July 30, 2015
    Publication date: November 19, 2015
    Inventors: Markku Rouvala, Yinglin Liu, Piers Andrew, Pritesh Hiralal, Haolan Wang, Gehan Amaratunga
  • Publication number: 20140165683
    Abstract: A solid fertilizer composition wherein a nitrogen-containing macronutrient is adsorbed on the surface of hydroxyapatite phosphate nanoparticles and wherein the ratio of the nitrogen-containing macronutrient to the hydroxyapatite phosphate is between 1:1 and 10:1. In certain embodiments, said solid fertilizer composition slowly releases the nitrogen-containing macronutrient to soil.
    Type: Application
    Filed: February 20, 2014
    Publication date: June 19, 2014
    Applicant: Sri Lanka Institute of Nanotechnology (PVT) Ltd.
    Inventors: Nilwala Kottegoda, D.A.S. Siriwardhana, W.M.G.I. Priyadarshana, Chanaka Sandaruwan, D.A.D. Madushanka, U.A. Rathnayake, Sunanda Gunasekara, Damayanthi Dahanayake, Ajith DeAlwis, Asurusinghe Kumarasinghe, Veranja Karunaratne, Gehan Amaratunga
  • Patent number: 8696784
    Abstract: A fertilizer composition wherein a nitrogen containing macronutrient is adsorbed on the surface of hydroxyapatite phosphate nanoparticles. Said fertilizer composition slowly releases the nitrogen containing macronutrient to soil.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: April 15, 2014
    Assignee: Sri Lanka Institute of Nanotechnology (Pvt) Ltd
    Inventors: Nilwala Kottegoda, Gayan Priyadharshana, Chanaka Sandaruwan, Damayanthi Dahanayake, Sunanda Gunasekara, A. J. Gehan Amaratunga, Veranja Karunaratne
  • Publication number: 20130176661
    Abstract: An apparatus, the apparatus including first and second circuit boards, and an electrolyte, the first and second circuit boards each including a capacitive element, wherein the apparatus is configured such that a chamber is defined between the first and second circuit boards with the capacitive elements contained therein and facing one another, the chamber including the electrolyte, and wherein the apparatus is configured to store electrical charge when a potential difference is applied between the capacitive elements.
    Type: Application
    Filed: September 28, 2010
    Publication date: July 11, 2013
    Inventors: Markku Rouvala, Yinglin Liu, Piers Andrew, Pritesh Hiralal, Haolan Wang, Gehan Amaratunga
  • Publication number: 20130098125
    Abstract: A fertilizer composition wherein a nitrogen containing macronutrient is adsorbed on the surface of hydroxyapatite phosphate nanoparticles. Said fertilizer composition slowly releases the nitrogen containing macronutrient to soil.
    Type: Application
    Filed: December 7, 2012
    Publication date: April 25, 2013
    Applicant: SRI LANKA INSTITUTE OF NANOTECHNOLOGY (PVT) LTD.
    Inventors: Nilwala Kottegoda, Gayan Priyadharshana, Chanaka Sandaruwan, Damayanthi Dahanayake, Sunanda Gunasekara, A. J. Gehan Amaratunga, Veranja Karunaratne
  • Patent number: 8320598
    Abstract: An apparatus and method of providing an apparatus, the apparatus including: a loudspeaker configured to convert an electrical input signal into an acoustic output signal; and carbon nanohorn material wherein the carbon nanohorn material is positioned so as to be exposed to the acoustic output signal.
    Type: Grant
    Filed: October 26, 2009
    Date of Patent: November 27, 2012
    Assignee: Nokia Corporation
    Inventors: Markku Rouvala, Tim Mellow, Pritesh Hiralal, Haolan Wang, Gehan Amaratunga
  • Publication number: 20100329498
    Abstract: An apparatus and method of providing an apparatus, the apparatus including a loudspeaker configured to convert an electrical input signal into an acoustic output signal; and carbon nanohorn material wherein the carbon nanohorn material is positioned so as to be exposed to the acoustic output signal.
    Type: Application
    Filed: June 30, 2009
    Publication date: December 30, 2010
    Inventors: Markku Rouvala, Tim Mellow, Pritesh Hiralal, Haolan Wang, Gehan Amaratunga
  • Publication number: 20100328845
    Abstract: An electrical energy storage device structure comprises a first conductive sheet, a second conductive sheet and an electrolyte sheet placed between the first conductive sheet and the second conductive sheet. In the device, at least one of the first conductive sheet and the second conductive sheet comprises a layer of carbon nanoparticles. The carbon nanoparticle layer is arranged to be adjacent to the electrolyte sheet. The carbon nanoparticles may include both high aspect ratio carbon nanoparticles and low aspect ratio carbon nanoparticles. The device is flexible and at least partially transparent.
    Type: Application
    Filed: June 25, 2009
    Publication date: December 30, 2010
    Inventors: Pritesh Hiralal, Husnu Emrah Unalan, Haolan Wang, Gehan Amaratunga, Di Wei, Markku Antti Kyosti Rouvala
  • Publication number: 20100329494
    Abstract: An apparatus and method of providing an apparatus, the apparatus including: a loudspeaker configured to convert an electrical input signal into an acoustic output signal; and carbon nanohorn material wherein the carbon nanohorn material is positioned so as to be exposed to the acoustic output signal.
    Type: Application
    Filed: October 26, 2009
    Publication date: December 30, 2010
    Inventors: Markku Rouvala, Tim Mellow, Pritesh Hiralal, Haolan Wang, Gehan Amaratunga
  • Publication number: 20100178568
    Abstract: An energy storage device structure comprises a first electrode layer, an electrolyte layer and a second electrode layer. At least one of the electrode layers comprise a metallic base layer and a layer of carbon nanotubes grown on the base layer, the carbon nanotube layer being arranged to face the electrolyte layer. The structure has much larger width and length than thickness, so it is rolled up or folded and then hermetically sealed to form an energy storage unit. The layer of carbon nanotubes is grown on the metallic base layer by a chemical vapor deposition process at a temperature no higher than 550° C. The carbon nanotubes in the carbon nanotube layer are at least partially aligned in a direction that is perpendicular to the surface of the metallic base layer.
    Type: Application
    Filed: January 13, 2009
    Publication date: July 15, 2010
    Inventors: Husnu Emrah Unalan, Nalin Lalith Rupesinghe, Gehan Amaratunga
  • Publication number: 20100178531
    Abstract: An energy storage device structure comprises a first electrode layer, an electrolyte layer and a second electrode layer. At least one of the electrode layers comprise a metallic base layer, a layer of carbon nanotubes grown on the base layer and a layer of carbon nanoparticles disposed on the carbon nanotube layer, the carbon nanoparticle layer being arranged to face the electrolyte layer. The structure has much larger width and length than thickness, so it is rolled up or folded and then hermetically sealed to form an energy storage unit. The layer of carbon nanotubes is grown on the metallic base layer by a chemical vapor deposition process at a temperature no higher than 550° C. The carbon nanotubes in the carbon nanotube layer are at least partially aligned in a direction that is perpendicular to the surface of the metallic base layer.
    Type: Application
    Filed: January 13, 2009
    Publication date: July 15, 2010
    Inventors: Gehan Amaratunga, Haolan Wang, Husnu Emrah Unalan, Markku Antti Kyosti Rouvala, Di Wei