Patents by Inventor David Leung

David Leung 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: 8258852
    Abstract: A motor driver circuit for driving the gate node of a high-side driver transistor to a boosted voltage from a charge pump draws little or no static current from the charge pump. The gate node is pulled to the boosted voltage by a p-channel pullup-control transistor that is driven by p-channel transistors that are pumped by capacitors that cut off current flow to ground from the charge pump. An n-channel output-shorting transistor shorts the gate node to the output when the high-side driver is turned off. A coupling capacitor initializes the shorting transistor for each output transition. A p-channel output-sensing transistor generates a feedback to a second stage that drives the coupling capacitor. P-channel diode transistors and an n-channel equalizing transistor control the voltage on the coupling capacitor.
    Type: Grant
    Filed: November 18, 2010
    Date of Patent: September 4, 2012
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Lap Chi David Leung, Yat Tung Lai, Chun Fai Wong, Kam Hung Chan, Kwok Kuen David Kwong
  • Publication number: 20120126736
    Abstract: A motor driver circuit for driving the gate node of a high-side driver transistor to a boosted voltage from a charge pump draws little or no static current from the charge pump. The gate node is pulled to the boosted voltage by a p-channel pullup-control transistor that is driven by p-channel transistors that are pumped by capacitors that cut off current flow to ground from the charge pump. An n-channel output-shorting transistor shorts the gate node to the output when the high-side driver is turned off. A coupling capacitor initializes the shorting transistor for each output transition. A p-channel output-sensing transistor generates a feedback to a second stage that drives the coupling capacitor. P-channel diode transistors and an n-channel equalizing transistor control the voltage on the coupling capacitor.
    Type: Application
    Filed: November 18, 2010
    Publication date: May 24, 2012
    Applicant: Hong Kong Applied Science & Technology Research Institute Company Limited
    Inventors: Lap Chi (David) LEUNG, Yat Tung LAI, Chun Fai WONG, Kam Hung CHAN, Kwok Kuen KWONG
  • Patent number: 8179455
    Abstract: A Optical Black Pixel (OBP) cancellation circuit corrects offsets in sensors in a CCD/CMOS image sensor when reading dark pixels such at the periphery. A pixel voltage is switched to a sampling capacitor during two phases of the same pixel pulse. Sampling capacitors and feedback capacitors connect to differential inputs of an amplifier. An accumulating capacitor accumulates voltage differences and generates a common-mode voltage that is fed back to another sampling capacitor that stores an amplifier offset. The sampling capacitor and accumulating capacitor and their associated switches form a discrete-time first-order low-pass filter that filters the pixel voltage during the first phase. In the second phase the amplifier acts as a unity-gain amplifier to output an average of the pixel voltage differences generated during an OBP time when blackened or covered pixels are read from the image sensor.
    Type: Grant
    Filed: March 11, 2010
    Date of Patent: May 15, 2012
    Assignee: Hong Kong Applied Science and Technology Research Institute Co., Ltd.
    Inventors: Lap Chi (David) Leung, Yat Tung Lai, Chun Fai Wong, Kam Hung Chan, Kwok Kuen (David) Kwong
  • Patent number: 8129348
    Abstract: Disclosed are biologically active protein conjugates that comprise a biologically active polypeptide coupled via a peptide bond to a polypeptide comprising from 2 to about 500 units of a repeating peptide motif, wherein the biologically active protein conjugate exhibits a modified plasma half-life compared to the intrinsic half-life of the unconjugated biologically active polypeptide or protein. Also disclosed are methods of making and using the conjugated proteins, as well as methods for determining whether a given conjugate exhibits a modified half life relative to the intrinsic half life of the unconjugated polypeptide.
    Type: Grant
    Filed: October 14, 2008
    Date of Patent: March 6, 2012
    Assignee: Cell Therapeutics, Inc.
    Inventors: Marc Besman, Stewart Chipman, David Leung, Jack Singer
  • Publication number: 20110221938
    Abstract: A Optical Black Pixel (OBP) cancellation circuit corrects offsets in sensors in a CCD/CMOS image sensor when reading dark pixels such at the periphery. A pixel voltage is switched to a sampling capacitor during two phases of the same pixel pulse. Sampling capacitors and feedback capacitors connect to differential inputs of an amplifier. An accumulating capacitor accumulates voltage differences and generates a common-mode voltage that is fed back to another sampling capacitor that stores an amplifier offset. The sampling capacitor and accumulating capacitor and their associated switches form a discrete-time first-order low-pass filter that filters the pixel voltage during the first phase. In the second phase the amplifier acts as a unity-gain amplifier to output an average of the pixel voltage differences generated during an OBP time when blackened or covered pixels are read from the image sensor.
    Type: Application
    Filed: March 11, 2010
    Publication date: September 15, 2011
    Applicant: Hong Kong Applied Science & Technology Research Institute Company Limited
    Inventors: Lap Chi (David) LEUNG, Yat Tung LAI, Chun Fai WONG, Kam Hung CHAN, Kwok Kuen (David) KWONG
  • Publication number: 20110051979
    Abstract: An ear tip comprised of two or more contiguous materials, in combination with sound conduit structure comprised of one or more rigid materials, wherein the ear tip mounts upon said sound conduit structure.
    Type: Application
    Filed: January 4, 2010
    Publication date: March 3, 2011
    Applicant: Monster Cable Products, Inc.
    Inventors: Noel Lee, David Leung
  • Publication number: 20100056073
    Abstract: A connecting cable with a built-in FM tuner and transmitter for connecting a portable entertainment device with an external entertainment system for wireless playback from the device to the system over preset frequencies, and which the user can operate without needing to look at the apparatus in order to select a different FM frequency for playback operation if the need arises.
    Type: Application
    Filed: August 29, 2008
    Publication date: March 4, 2010
    Applicant: Monster Cable Products, Inc.
    Inventors: David Leung, Yasuhiro Yamamoto
  • Publication number: 20100052613
    Abstract: A battery charger having an integral cable management means is adapted to receive power from a vehicle electrical system and provide power to a portable personal electronic device, for recharging the portable personal electronic device battery while allowing the audio and/or video output of the device to simultaneously be provided for listening or viewing by the user.
    Type: Application
    Filed: August 29, 2008
    Publication date: March 4, 2010
    Applicant: Monster Cable Products, Inc.
    Inventors: David Leung, Yasuhiro Yamamoto
  • Publication number: 20090298762
    Abstract: Disclosed are biologically active protein conjugates that comprise a biologically active polypeptide coupled via a peptide bond to a polypeptide comprising from 2 to about 500 units of a repeating peptide motif, wherein the biologically active protein conjugate exhibits a modified plasma half-life compared to the intrinsic half-life of the unconjugated biologically active polypeptide or protein. Also disclosed are methods of making and using the conjugated proteins, as well as methods for determining whether a given conjugate exhibits a modified half life relative to the intrinsic half life of the unconjugated polypeptide.
    Type: Application
    Filed: October 14, 2008
    Publication date: December 3, 2009
    Applicant: Cell Therapeutics, Inc.
    Inventors: Marc Besman, Stewart Chipman, David Leung, Jack Singer
  • Patent number: 7408378
    Abstract: Described are on-die termination (ODT) systems and methods that facilitate high-speed communication between a transmitter die and a receiver die interconnected via one or more signal transmission lines. An ODT control system in accordance with one embodiment calibrates and maintains the termination resistances for the signal transmission lines. The ODT control system derives a number of calibration currents from precision voltage and resistance references and distributes the reference currents to a number of transmitters. Each transmitter then derives an ODT calibration signal using the respective reference current and another precision resistor, and then employs the calibration signal to calibrate local termination elements. Distributing calibrated currents provides excellent noise immunity, while limiting the requisite number of external voltage references reduces cost.
    Type: Grant
    Filed: November 23, 2005
    Date of Patent: August 5, 2008
    Assignee: Rambus Inc.
    Inventors: Scott C. Best, Anthony Koon Wong, David Leung
  • Patent number: 7335269
    Abstract: A Pb-free solder alloy based on Sn as matrix is provided, which is a metal that has no toxicity and is environmental friendly. The Pb-free solder comprises a tetra-nary composition consisting essentially of about 99.0 weight % Sn, 0.3 to 0.4 weight % Ag, and 0.6 to 0.7 weight % Cu, with off-eutectic melting temperature of 217 to 227 degree Celsius. The fourth component is a non-metallic phosphorus (P), and 0.01 to 1.0 weight % of phosphorus is added into said composition to improve better micro-structural stability and hence reduce the formation of dross when hand soldering, wave soldering and reflow soldering during the electronic assembly installation process.
    Type: Grant
    Filed: February 23, 2006
    Date of Patent: February 26, 2008
    Assignee: Aoki Laboratories Ltd.
    Inventor: Wai Yin David Leung
  • Publication number: 20070238642
    Abstract: DNA isolates coding for a vascular endothelial cell growth factor may be used to produce the protein via recombinant expression systems. Such protein is useful therapeutically to treat conditions in which a selective action on the vascular endothelial cells, in the absence of excessive connective tissue proliferation, is desirable.
    Type: Application
    Filed: September 22, 2006
    Publication date: October 11, 2007
    Applicant: Genentech, Inc.
    Inventors: Napoleone Ferrara, David Leung
  • Patent number: D588352
    Type: Grant
    Filed: May 29, 2007
    Date of Patent: March 17, 2009
    Assignee: Ofess Limited
    Inventor: Pak Keung David Leung
  • Patent number: D617986
    Type: Grant
    Filed: August 4, 2009
    Date of Patent: June 22, 2010
    Assignee: Ofess Limited
    Inventor: Pak Keung David Leung
  • Patent number: D622086
    Type: Grant
    Filed: July 2, 2009
    Date of Patent: August 24, 2010
    Inventor: David Leung
  • Patent number: D624746
    Type: Grant
    Filed: December 16, 2009
    Date of Patent: October 5, 2010
    Assignee: Ofess Limited
    Inventors: Pak Keung David Leung, Pui Kay Mo Mou
  • Patent number: D630875
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: January 18, 2011
    Inventor: David Leung
  • Patent number: D635350
    Type: Grant
    Filed: May 11, 2010
    Date of Patent: April 5, 2011
    Assignee: Ofess Limited
    Inventors: Pak Keung David Leung, Pui Kay Mo Mou
  • Patent number: D637390
    Type: Grant
    Filed: May 11, 2010
    Date of Patent: May 10, 2011
    Assignee: Ofess Limited
    Inventors: Pak Keung David Leung, Pui Kay Mo Mou
  • Patent number: D652821
    Type: Grant
    Filed: January 3, 2011
    Date of Patent: January 24, 2012
    Assignee: Monster Cable Products, Inc.
    Inventors: Noel Lee, Jacky Hsiung, David Leung, Einstein Galang