Patents by Inventor Andrew Wee

Andrew Wee 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).

  • Hole doping of graphene
    Patent number: 9269773
    Abstract: An article includes a layer of graphene having a first work function; and a metal oxide film disposed on the layer of graphene, the metal oxide film having a second work function greater than the first work function. Electrons are transferred from the layer of graphene to the metal oxide film, forming a hole accumulation layer in the layer of graphene.
    Type: Grant
    Filed: May 5, 2011
    Date of Patent: February 23, 2016
    Assignee: National University of Singapore
    Inventors: Wei Chen, Zhenyu Chen, Thye Shen Andrew Wee, Lanfei Xie, Xiao Wang, Jiatao Sun, Ariando
  • HOLE DOPING OF GRAPHENE
    Publication number: 20130048952
    Abstract: An article includes a layer of graphene having a first work function; and a metal oxide film disposed on the layer of graphene, the metal oxide film having a second work function greater than the first work function. Electrons are transferred from the layer of graphene to the metal oxide film, forming a hole accumulation layer in the layer of graphene.
    Type: Application
    Filed: May 5, 2011
    Publication date: February 28, 2013
    Applicant: National University of Singapore
    Inventors: Wei Chen, Zhenyu Chen, Thye Shen Andrew Wee, Lanfei Xie, Xiao Wang, Jiatao Sun, Ariando
  • Shifting apparatus and method
    Patent number: 7617875
    Abstract: A device for shifting a sliding sleeve. The sliding sleeve is concentrically positioned within a well, and wherein the well is in communication with a hydrocarbon reservoir. In the most preferred embodiment, the device comprises an outer housing forming an annulus with the well and a power piston slidably disposed within the outer housing. The power piston includes an upper shoulder configured to form an annular chamber and a tubular chamber relative to the outer housing, a lower shoulder configured to form an atmospheric chamber relative to the outer housing. The device further comprises a first latch for preventing upward movement of the power piston, a second latch for preventing downward movement of the power piston, and wherein movement of the power piston shifts the sliding sleeve.
    Type: Grant
    Filed: April 20, 2007
    Date of Patent: November 17, 2009
    Assignee: PetroQuip Energy Services, LLP
    Inventors: William J. Darnell, Bryan Lane, William Tyler Livingston, Andrew Wee-Mien Wong
  • Shifting apparatus and method
    Publication number: 20080257558
    Abstract: A device for shifting a sliding sleeve. The sliding sleeve is concentrically positioned within a well, and wherein the well is in communication with a hydrocarbon reservoir. In the most preferred embodiment, the device comprises an outer housing forming an annulus with the well and a power piston slidably disposed within the outer housing. The power piston includes an upper shoulder configured to form an annular chamber and a tubular chamber relative to the outer housing, a lower shoulder configured to form an atmospheric chamber relative to the outer housing. The device further comprises a first latch for preventing upward movement of the power piston, a second latch for preventing downward movement of the power piston, and wherein movement of the power piston shifts the sliding sleeve.
    Type: Application
    Filed: April 20, 2007
    Publication date: October 23, 2008
    Inventors: William J. Darnell, Bryan Lane, William Tyler Livingston, Andrew Wee-Mien Wong
  • METHOD OF CAPTURING CARBON DIOXIDE FROM GAS STREAMS
    Publication number: 20080050296
    Abstract: The present invention relates to a method for removing carbon dioxide (CO2) from a gas stream. Particularly, the present invention relates to a method for removing CO2 from a gas stream by a liquid absorbent having an amino alcohol derived from 4-amino-2-butanol. In comparison to conventional amines, the amino alcohols of the present invention have been found to provide a higher CO2 absorption capacity and a higher cyclic capacity for CO2 removal.
    Type: Application
    Filed: August 23, 2007
    Publication date: February 28, 2008
    Applicant: University of Regina
    Inventors: Paitoon Tontiwachwuthikul, Andrew Wee, Raphael Idem, Kreangkrai Maneeintr, Gao-jun Fan, Amornvadee Veawab, Amr Henni, Adisorn Aroonwilas, Amit Chakma
  • Selective area growth of aligned carbon nanotubes on a modified catalytic surface
    Publication number: 20040009115
    Abstract: This invention provides a method for making a catalyst for use in the preparation of carbon nanotubes, which method comprises subjecting a thin film of a catalytic metal on a support to selective mechanical or electromagnetic modification to enhance the grain size of the metal.
    Type: Application
    Filed: June 12, 2003
    Publication date: January 15, 2004
    Inventors: Thye Shen Andrew Wee, Amarsinh Gohel, Kok Chung Chin