Patents by Inventor Wai YU

Wai YU 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: 20140253564
    Abstract: Systems and methods include an electronic device having multiple GPUs and a GPU power control process that controls switching between a first GPU and a second GPU, such as a high performance GPU. The electronic device uses the first GPU when an external device is coupled to an adapter connected to the electronic device.
    Type: Application
    Filed: May 23, 2014
    Publication date: September 11, 2014
    Applicant: Apple Inc.
    Inventors: David J. Redman, Wai Yu Trevor Tsang
  • Patent number: 8736618
    Abstract: Systems and methods include an electronic device having multiple GPUs and a GPU power control process that controls switching between a first GPU and a second GPU, such as a high performance GPU. The electronic device may be coupled to an external display by a passive adapter or an active adapter. The GPU power control process may determine if the second GPU is active and switch to the second GPU upon connection of the external display through either the passive adapter or the active adapter. Upon connection of an active adapter, the GPU power control process may use hot plug functionality to determine connection of the external display to the active adapter and provide appropriate switching in response thereto.
    Type: Grant
    Filed: April 29, 2010
    Date of Patent: May 27, 2014
    Assignee: Apple Inc.
    Inventors: David J. Redman, Wai Yu Trevor Tsang
  • Publication number: 20140138473
    Abstract: Missile guidance involving projection of laser light to define a Laser Information Field (LIF) is augmented by interposition of information pulses, interleaved between laser emissions establishing the LIF. Information pulses encode further information for receipt by a missile, such as an angle of roll of a missile launch platform from which the LIF is emitted.
    Type: Application
    Filed: July 18, 2012
    Publication date: May 22, 2014
    Applicant: Thales Holdings UK Plc
    Inventor: Wai YU
  • Patent number: 8715860
    Abstract: A non-aqueous battery with improved volume energy density and enhanced load characteristics is made available even when using olivine-type lithium phosphate as a positive electrode active material. The non-aqueous electrolyte battery of the present invention is provided with a positive electrode (1) containing lithium iron phosphate as a positive electrode active material, a negative electrode (2), and a non-aqueous electrolyte (4). In the positive electrode (1), a positive electrode active material-containing layer that is made of the positive electrode active material, a conductive agent, and a binder agent is formed on a positive electrode current collector. The positive electrode current collector has a thickness of less than 20 ?m and its surface that is in contact with the positive electrode active material-containing layer has a mean surface roughness Ra of greater than 0.026.
    Type: Grant
    Filed: February 14, 2005
    Date of Patent: May 6, 2014
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Takao Inoue, Kazunori Donoue, Denis Yau Wai Yu, Masahisa Fujimoto, Shin Fujitani
  • Publication number: 20140017527
    Abstract: An object of the invention is to improve the safety of nonaqueous electrolyte secondary batteries in the event of overcharging. The invention is directed to a nonaqueous electrolyte secondary battery including a positive electrode containing a positive electrode active material, a negative electrode, a nonaqueous electrolyte, a separator and a current interrupting element, the positive electrode active material including a first compound represented by the general formula LiCoxM1-xO2 (wherein 0.1?x?1 and M is one or more metal elements including at least Ni or Mn) and a second compound generating a gas when the positive electrode potential becomes not less than 4.5 V versus lithium metal, the current interrupting element being a pressure-sensitive current interrupting element.
    Type: Application
    Filed: April 10, 2012
    Publication date: January 16, 2014
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventor: Denis Yau Wai YU
  • Patent number: 8557440
    Abstract: A positive electrode active material having a lithium-excess lithium-transition metal composite oxide particle represented by the chemical formula Li1.2Mn0.54Ni0.13Co0.13O2. The lithium-excess lithium-transition metal composite oxide particle has an inner portion (1) having a layered structure and a surface adjacent portion (2) having a crystal structure gradually changing from a layered structure to a spinel structure from the inner portion (1) toward the outermost surface portion (3). The layered structure and the spinel structure have an identical ratio of the amount of Mn and the total amount of Ni and Co.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: October 15, 2013
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Denis Yau Wai Yu, Katsunori Yanagida
  • Patent number: 8501354
    Abstract: Using a non-aqueous electrolyte secondary battery containing lithium iron phosphate as a positive electrode active material and graphite as a negative electrode active material, a low-cost, high energy density battery is provided that exhibits good performance at high rate current and good cycle performance even at high temperature. The non-aqueous electrolyte secondary battery has a positive electrode having a positive electrode current collector and a positive electrode active material-containing layer formed on a surface of the positive electrode current collector, the positive electrode active material-containing layer containing a conductive agent and a positive electrode active material including lithium iron phosphate, a negative electrode containing a carbon material, and a non-aqueous electrolyte. The non-aqueous electrolyte contains vinylene carbonate.
    Type: Grant
    Filed: February 6, 2007
    Date of Patent: August 6, 2013
    Assignee: SANYO Electric Co., Ltd.
    Inventors: Kazunori Donoue, Denis Yau Wai Yu, Takao Inoue, Masahisa Fujimoto, Hiroshi Kurokawa
  • Patent number: 8326783
    Abstract: A method and system to minimize redundancy in testing a new software system by utilizing a knowledge base is provided. The knowledge base may be represented in a form of a decision tree including leaf nodes which store previously tested optimal configurations. When the knowledge base does not contain an optimal configuration for the new software, an optimal solution for the new software system may be determined by adding a further decision tree branch to the initial decision tree. A desirable tree branch may be selected from a table including a predetermined set of desirable tree branches for each category of software. As a result, the number of solutions to be tested on the input software may be limited and cost and effort to run redundant tests on a software system may be reduced.
    Type: Grant
    Filed: February 29, 2008
    Date of Patent: December 4, 2012
    Assignee: International Business Machines Corporation
    Inventors: Kenneth Michael Ashcraft, Flavio Alvarenga Bergamaschi, Viktors Bertsis, Erin Christine Burke, Duy Huynh, Santhosh Rao, Duc J. Vianney, Peter Wai Yu Wong
  • Publication number: 20120115043
    Abstract: A nonaqueous electrolyte secondary battery includes a positive electrode containing a positive electrode active material, a negative electrode containing a negative electrode active material, and a nonaqueous electrolyte solution containing a nonaqueous solvent. The positive electrode active material contains a lithium-containing transition metal oxide represented by general formula (1), Li1+xMnyMzO2 (where x, y, and z satisfy 0<x<0.4, 0<y<1, 0<z<1, and x+y+z=1; and M represents at least one metal element and contains at least one of Ni and Co). The nonaqueous solvent contains a fluorinated cyclic carbonate having two or more fluorine atoms directly bonded to a carbonate ring.
    Type: Application
    Filed: November 9, 2011
    Publication date: May 10, 2012
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Denis Yau Wai YU, Katsunori Yanagida, Hidekazu Yamamoto
  • Patent number: 8153302
    Abstract: A method of producing an active material for a lithium secondary battery, by which impurities causing problems in synthesizing an active material for a lithium secondary battery, including a lithium transition metal oxyanion compound are removed efficiently and enhancement of an energy density is realized, is provided. By cleaning the active material for a lithium secondary battery, including a lithium transition metal oxyanion compound, with a pH buffer solution, for example, it is possible to efficiently remove just only impurities such as Li3PO4 or Li2CO3, or a substance, other than LiFePO4, in which the valence of Fe is bivalent such as FeSO4, FeO or Fe3(PO4)2 without dissolving Fe of LiFePO4.
    Type: Grant
    Filed: February 27, 2008
    Date of Patent: April 10, 2012
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Denis Yau Wai Yu, Kazunori Donoue, Toshikazu Yoshida, Tetsuo Kadohata, Tetsuyuki Murata, Shigeki Matsuta
  • Publication number: 20120079712
    Abstract: A method of producing an active material for a lithium secondary battery, by which impurities causing problems in synthesizing an active material for a lithium secondary battery, including a lithium transition metal oxyanion compound are removed efficiently and enhancement of an energy density is realized, is provided. By cleaning the active material for a lithium secondary battery, including a lithium transition metal oxyanion compound, with a pH buffer solution, for example, it is possible to efficiently remove just only impurities such as Li3PO4 or Li2CO3, or a substance, other than LiFePO4, in which the valence of Fe is bivalent such as FeSO4, FeO or Fe3(PO4)2 without dissolving Fe of LiFePO4.
    Type: Application
    Filed: December 9, 2011
    Publication date: April 5, 2012
    Inventors: Denis Yau Wai YU, Kazunori Donoue, Toshikazu Yoshida, Tetsuo Kadohata, Tetsuyuki Murata, Shigeki Matsuta
  • Publication number: 20120077088
    Abstract: A method for manufacturing a positive electrode active material for a nonaqueous electrolyte secondary battery including the steps of mixing a lithium source and a tetravalent manganese source and reacting the lithium source and the manganese source at a temperature lower than 600° C. while tetravalent manganese is reduced, so as to produce a lithium manganese compound oxide, wherein the positive electrode active material is formed from the lithium manganese compound oxide where the lithium manganese compound oxide is represented by a general formula LixMnO2 (x?1) and which has a crystal structure of a space group C2/m.
    Type: Application
    Filed: September 26, 2011
    Publication date: March 29, 2012
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Kazunori Donoue, Denis Yau Wai Yu
  • Publication number: 20110267359
    Abstract: Systems and methods include an electronic device having multiple GPUs and a GPU power control process that controls switching between a first GPU and a second GPU, such as a high performance GPU. The electronic device may be coupled to an external display by a passive adapter or an active adapter. The GPU power control process may determine if the second GPU is active and switch to the second GPU upon connection of the external display through either the passive adapter or the active adapter. Upon connection of an active adapter, the GPU power control process may use hot plug functionality to determine connection of the external display to the active adapter and provide appropriate switching in response thereto.
    Type: Application
    Filed: April 29, 2010
    Publication date: November 3, 2011
    Applicant: APPLE INC.
    Inventors: David J. Redman, Wai Yu Trevor Tsang
  • Publication number: 20110200880
    Abstract: A positive electrode active material for lithium secondary batteries having a lithium-containing transition metal oxide having a layered structure and represented by the general formula Li1+xMn1-x-yMyO2, where 0<x<0.33, 0<y<0.66, and M is at least one transition metal other than Mn, the lithium-containing transition metal oxide having a boron oxide layer formed on the surface thereof.
    Type: Application
    Filed: February 18, 2011
    Publication date: August 18, 2011
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventor: Denis Yau Wai Yu
  • Publication number: 20110076564
    Abstract: A positive electrode active material having a lithium-excess lithium-transition metal composite oxide particle represented by the chemical formula Li1.2Mn0.54Ni0.13Co0.13O2. The lithium-excess lithium-transition metal composite oxide particle has an inner portion (1) having a layered structure and a surface adjacent portion (2) having a crystal structure gradually changing from a layered structure to a spinel structure from the inner portion (1) toward the outermost surface portion (3). The layered structure and the spinel structure have an identical ratio of the amount of Mn and the total amount of Ni and Co.
    Type: Application
    Filed: September 30, 2010
    Publication date: March 31, 2011
    Applicant: SANYO Electric Co., Ltd.
    Inventors: Denis Yau Wai Yu, Katsunori Yanagida
  • Publication number: 20100233550
    Abstract: A non-aqueous electrolyte secondary battery has a positive electrode containing a positive electrode active material, a negative electrode, and a non-aqueous electrolyte solution in which an electrolyte is dissolved in a non-aqueous solvent. The positive electrode active material includes a lithium-containing transition metal oxide that releases oxygen during initial charge, and the non-aqueous solvent contains a fluorinated cyclic carbonate in which fluorine atoms are directly bonded to a carbonate ring.
    Type: Application
    Filed: March 16, 2010
    Publication date: September 16, 2010
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Katsunori Yanagida, Denis Yau Wai Yu, Koh Masahara, Daizo Jito, Maruo Kamino, Takeshi Ogasawara
  • Publication number: 20100112448
    Abstract: A positive electrode active material includes a layered lithium-manganese oxide represented by the general formula Li2-xMn1-yO3-p, where 0?x?2/3, 0?y?1/3, and 0?p?1, the lithium-manganese oxide having a full width half maximum of a peak of the (001) crystal plane, as determined by an X-ray diffraction analysis, of 0.22° or greater, and an average particle size of 130 nm or less.
    Type: Application
    Filed: October 30, 2009
    Publication date: May 6, 2010
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Denis Yau Wai Yu, Katsunori Yanagida
  • Patent number: D678109
    Type: Grant
    Filed: January 9, 2012
    Date of Patent: March 19, 2013
    Assignee: Research In Motion Limited
    Inventors: Alison Phillips, Caitlin Curran-Blaney, Wai Yu Chung
  • Patent number: D690512
    Type: Grant
    Filed: February 24, 2012
    Date of Patent: October 1, 2013
    Assignee: BlackBerry Limited
    Inventors: Alison Phillips, Caitlin Curran-Blaney, Wai Yu Chung
  • Patent number: D717262
    Type: Grant
    Filed: January 24, 2013
    Date of Patent: November 11, 2014
    Assignee: BlackBerry Limited
    Inventors: Alison Phillips, Todd Andrew Wood, Wai Yu Chung