Patents by Inventor Wee Kiong Choi

Wee Kiong Choi 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: 20210257677
    Abstract: A Li-ion thin film microbattery, a microbattery array, a method of fabricating a Li-ion thin film microbattery and a method of fabricating a microbattery array. The Li-ion thin film microbattery comprises a Li-free cathode comprising a transition metal oxide thin film; an anode comprising a lithiated Ge or Si thin film; and an electrolyte film disposed between the cathode and the anode; wherein a Li-source of the Li-ion thin film microbattery is provided by means of the lithiated Ge or Si thin film.
    Type: Application
    Filed: February 26, 2021
    Publication date: August 19, 2021
    Applicants: MASSACHUSETTS INSTITUTE OF TECHNOLOGY, NATIONAL UNIVERSITY OF SINGAPORE
    Inventors: Daniele Perego, Rajamouly Omampuliyur Swaminathan, Ye Lin Thu, Shao-Horn Yang, Wee Kiong Choi, Carl Vernette Thompson, II
  • Publication number: 20200212508
    Abstract: A Li-ion thin film microbattery, a microbattery array, a method of fabricating a Li-ion thin film microbattery and a method of fabricating a microbattery array. The Li-ion thin film microbattery comprises a Li-free cathode comprising a transition metal oxide thin film; an anode comprising a lithiated Ge or Si thin film; and an electrolyte film disposed between the cathode and the anode; wherein a Li-source of the Li-ion thin film microbattery is provided by means of the lithiated Ge or Si thin film.
    Type: Application
    Filed: July 28, 2017
    Publication date: July 2, 2020
    Applicants: MASSACHUSETTS INSTITUTE OF TECHNOLOGY, NATIONAL UNIVERSITY OF SINGAPORE
    Inventors: Daniele PEREGO, Rajamouly OMAMPULIYUR SWAMINATHAN, Ye Lin Thu (No Family Name), Shao-Horn YANG, Wee Kiong CHOI, Carl Vernette THOMPSON, II
  • Publication number: 20140357529
    Abstract: There is provided a microarray comprising a plurality of active agents immobilized onto an array of porous nanostructures, wherein each nanostructure has a network of pores that extends throughout the thickness of said nano structure.
    Type: Application
    Filed: December 19, 2012
    Publication date: December 4, 2014
    Applicant: National University of Singapore
    Inventors: Wee Kiong Choi, Heng Phon Too, Raj Rajagopalan, Lihan Zhou, Mohammed Khalid Bin Dawood, Han Zheng, He Cheng
  • Patent number: 8668833
    Abstract: A method of forming a discrete nanostructured element at one or more predetermined locations on a substrate is presented. The method includes forming a mask member over the substrate. A window is formed in the mask member at each of one or more locations at which it is required to form the nanostructured element thereby to expose a portion of a surface of the substrate. A portion of the substrate exposed by the window at the one or more locations is removed to form one or more recesses in the substrate. The method further includes forming a layer of a nanostructure medium over a surface of the recess and annealing the structure thereby to form the nanostructured element in each of the one or more recesses. The nanostructured element includes a portion of the nanostructure medium and has an external dimension along at least two substantially orthogonal directions of less than substantially 100 nm.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: March 11, 2014
    Assignees: GLOBALFOUNDRIES Singapore Pte. Ltd., National University of Singapore
    Inventors: Han Guan Chew, Fei Zheng, Wee Kiong Choi, Tze Haw Liew
  • Publication number: 20130171413
    Abstract: Methods for altering the wetting property of the surface of a substrate are disclosed. The methods can include the step of providing an array of nanostructures on the substrate, each nanostructure having a proximal end adjacent to the substrate and a distal end opposite to the proximal end. The methods can also include the step of moving the distal ends of at least one subset of the array of nanostructures towards each other to form at least one nanostructure cluster. The nanostructures of each cluster have distal ends that are spaced closer to each other relative to the respective proximal ends of the adjacent nanostructures, the nanostructure cluster altering the wetting property of the substrate.
    Type: Application
    Filed: September 13, 2011
    Publication date: July 4, 2013
    Inventors: Saif A. Khan, Mohammed Khalid Bin Dawood, Raj Rajagopalan, Wee Kiong Choi, Han Zheng
  • Publication number: 20090291311
    Abstract: A method of forming a discrete nanostructured element at one or more predetermined locations on a substrate is presented. The method includes forming a mask member over the substrate. A window is formed in the mask member at each of one or more locations at which it is required to form the nanostructured element thereby to expose a portion of a surface of the substrate. A portion of the substrate exposed by the window at the one or more locations is removed to form one or more recesses in the substrate. The method further includes forming a layer of a nanostructure medium over a surface of the recess and annealing the structure thereby to form the nanostructured element in each of the one or more recesses. The nanostructured element includes a portion of the nanostructure medium and has an external dimension along at least two substantially orthogonal directions of less than substantially 100 nm.
    Type: Application
    Filed: May 21, 2008
    Publication date: November 26, 2009
    Applicants: CHARTERED SEMICONDUCTOR MANUFACTURING, LTD., NATIONAL UNIVERSITY OF SINGAPORE
    Inventors: Han Guan Chew, Fei Zheng, Wee Kiong Choi, Tze Haw Liew
  • Publication number: 20080217678
    Abstract: A memory gate stack structure (100) comprising a substrate layer (102) comprising a silicon-based material, a tunnel layer (104) formed on the substrate layer, a charge storage layer (106) formed on the tunnel layer and comprising a hafnium-aluminium-oxide-based material, a blocking layer (108) formed on the charge storage layer, and a gate layer (110) formed on the blocking layer.
    Type: Application
    Filed: March 11, 2004
    Publication date: September 11, 2008
    Applicant: National University of Singapore
    Inventors: Yan Ny Tan, Wai Kim Chim, Byung Jin Cho, Wee Kiong Choi
  • Patent number: 6962850
    Abstract: Devices with embedded silicon or germanium nanocrystals, fabricated using ion implantation, exhibit superior data-retention characteristics relative to conventional floating-gate devices. However, the prior art use of ion implantation for their manufacture introduces several problems. These have been overcome by initial use of rapid thermal oxidation to grow a high quality layer of thin tunnel oxide. Chemical vapor deposition is then used to deposit a germanium doped oxide layer. A capping oxide is then deposited following which the structure is rapid thermally annealed to synthesize the germanium nanocrystals.
    Type: Grant
    Filed: October 1, 2003
    Date of Patent: November 8, 2005
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Vincent Ho, Wee Kiong Choi, Lap Chan, Wai Kin Chim, Vivian Ng, Cheng Lin Heng, Lee Wee Teo
  • Patent number: 6656792
    Abstract: A Flash memory is provided having a trilayer structure of rapid thermal oxide/germanium (Ge) nanocrystals in silicon dioxide (SiO2)/sputtered SiO2 cap with demonstrated via capacitance versus voltage (C-V) measurements having memory hysteresis due to Ge nanocrystals in the middle layer of the trilayer structure. The Ge nanocrystals are synthesized by rapid thermal annealing of a co-sputtered Ge+SiO2 layer.
    Type: Grant
    Filed: March 1, 2002
    Date of Patent: December 2, 2003
    Assignee: Chartered Semiconductor Manufacturing LTD
    Inventors: Wee Kiong Choi, Wai Kin Chim, Vivian Ng, Lap Chan
  • Publication number: 20030077863
    Abstract: A Flash memory is provided having a trilayer structure of rapid thermal oxide/germanium (Ge) nanocrystals in silicon dioxide (SiO2)/sputtered SiO2 cap with demonstrated via capacitance versus voltage (C-V) measurements having memory hysteresis due to Ge nanocrystals in the middle layer of the trilayer structure. The Ge nanocrystals are synthesized by rapid thermal annealing of a co-sputtered Ge+SiO2 layer.
    Type: Application
    Filed: March 1, 2002
    Publication date: April 24, 2003
    Inventors: Wee Kiong Choi, Wai Kin Chim, Vivian Ng, Lap Chan