Patents by Inventor Sum Chan

Sum Chan 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).

  • METHODS FOR DETECTING VITAMIN C BY MASS SPECTROMETRY
    Publication number: 20110179855
    Abstract: Provided are methods for determining the amount of vitamin C in a sample using mass spectrometry. The methods generally involve ionizing vitamin C in a sample and detecting and quantifying the amount of the ion to determine the amount of vitamin C in the sample.
    Type: Application
    Filed: April 1, 2011
    Publication date: July 28, 2011
    Inventors: Qibo Jiang, Richard Reitz, Sum Chan
  • Methods for detecting vitamin C by mass spectrometry
    Patent number: 7952067
    Abstract: Provided are methods for determining the amount of vitamin C in a sample using mass spectrometry. The methods generally involve ionizing vitamin C in a sample and detecting and quantifying the amount of the ion to determine the amount of vitamin C in the sample.
    Type: Grant
    Filed: November 12, 2008
    Date of Patent: May 31, 2011
    Assignee: Quest Diagnostics Investments Incorporated
    Inventors: Qibo Jiang, Richard Reitz, Sum Chan
  • Contactless card reader and information processing system
    Patent number: 7845567
    Abstract: The present invention provides a contactless card reader and an information processing system utilizes the card reader. The contactless card reader comprises a contactless card interface for communicating with a contactless card by means of radio frequency, a contact card interface coupled to said contactless card interface for communicating with a contact card, and a contact card which is a smart card with processing capability and which interacts with the contactless card via the contact card interface and contactless card interface.
    Type: Grant
    Filed: October 6, 2005
    Date of Patent: December 7, 2010
    Assignee: International Business Machines Corporation
    Inventors: Ming Sum Chan, Chun To Lee
  • VITAMIN B2 DETECTION BY MASS SPECTROMETRY
    Publication number: 20100155592
    Abstract: Methods are described for measuring the amount of a vitamin B2 in a sample. More specifically, mass spectrometric methods are described for detecting and quantifying vitamin B2 in a sample utilizing on-line extraction methods coupled with tandem mass spectrometric techniques.
    Type: Application
    Filed: February 3, 2009
    Publication date: June 24, 2010
    Inventors: Changming Yang, Sum Chan
  • CONSTRUCTION AND USE OF A FUNCTIONALLY HUMAN ANTIBODY LIBRARY WITH MAXIMIZED REPERTOIRE DIVERSITY
    Publication number: 20100137156
    Abstract: Immunoglobulin libraries are provided that contain randomly assembled FR1, CDR1, FR2, CDR2, FR3, CDR3 and FR4 sequences of heavy or light chain immunoglobulin variable regions. The libraries exhibit a degree of repertoire diversity not found in natural immune systems and can be used to express novel immunoglobulins. The libraries can be used for screening antibodies with the target specificity of interest. The resultant antibodies can be fully human and non-immunogenic.
    Type: Application
    Filed: March 10, 2008
    Publication date: June 3, 2010
    Inventors: Shui-on Leung, Pui Fan Wong, Chi Wai Kwong, Yip Sum Chan
  • Methods for Detecting Vitamin C by Mass Spectrometry
    Publication number: 20100084545
    Abstract: Provided are methods for determining the amount of vitamin C in a sample using mass spectrometry. The methods generally involve ionizing vitamin C in a sample and detecting and quantifying the amount of the ion to determine the amount of vitamin C in the sample.
    Type: Application
    Filed: November 12, 2008
    Publication date: April 8, 2010
    Inventors: Qibo Jiang, Richard Reitz, Sum Chan
  • MASS SPECTROMETRY METHOD FOR MEASURING THIAMINE IN BODY FLUID
    Publication number: 20090093009
    Abstract: Provided are methods for determining the amount of total thiamine in a body fluid sample using liquid chromatography and mass spectrometry. Total thiamine is converted to free thiamine by treatment with an acid phosphatase prior to thiamine separation and quantification.
    Type: Application
    Filed: October 9, 2007
    Publication date: April 9, 2009
    Inventors: Sum Chan, Qibo Jiang, Richard Reitz
  • Mass Spectrometry Method for Measuring Vitamin B6 in Body Fluid
    Publication number: 20080311671
    Abstract: Provided are methods of detecting the presence or amount of the active form of vitamin B6, pyridoxal 5?-phosphate, in a body fluid sample using tandem mass spectrometry coupled with liquid chromatography.
    Type: Application
    Filed: June 14, 2007
    Publication date: December 18, 2008
    Inventors: Qibo Jiang, Sum Chan, Richard Reitz
  • Process independent voltage controlled logarithmic attenuator having a low distortion and method therefor
    Patent number: 7453307
    Abstract: A process independent voltage controlled logarithmic attenuator has an attenuator control stage block having a first input coupled to a controlled input and a second input coupled to an offset generator. An attenuator transistor is coupled to the attenuator controlled stage block. An output of the attenuator controlled stage block is both slope and maximum voltage definable for a process independent design.
    Type: Grant
    Filed: February 23, 2005
    Date of Patent: November 18, 2008
    Assignee: Supertex, Inc.
    Inventors: Wilson Wai-Sum Chan, Hau-Yiu Tsui, Ka-Wai Ho, Isacc Terasuth Ko
  • Retaining mechanism
    Patent number: 6520470
    Abstract: A mechanism for releasably retaining an article, e.g. a liquid dispenser, with a base portion is disclosed, in which the dispenser includes a protrusion releasably engageable with the base portion, and the base portion includes locking means adapted to prevent disengagement of the dispenser from the base portion, and the locking means includes a ring which is movable, e.g. by rotation or swiveling action, relative to the base portion to lock or unlock the dispenser from said base portion.
    Type: Grant
    Filed: October 28, 1999
    Date of Patent: February 18, 2003
    Assignee: Kado Industrial Company Limited
    Inventor: Chik Sum Chan
  • Collapsible container
    Patent number: 6474095
    Abstract: A collapsible container is disclosed as having a number of walls which are movable relative to one another between a collapsed configuration in which at least a major surface of at least two of the walls are in contact with each other, and an expanded configuration in which the walls define a cavity adapted to receive an article, e.g. cans or bottles of soft drinks and beers, and the walls contain a casing containing saline water.
    Type: Grant
    Filed: October 17, 2001
    Date of Patent: November 5, 2002
    Assignee: Kado Industrial Co., Ltd.
    Inventor: Chik Sum Chan
  • Resettable latch circuit
    Patent number: 4970406
    Abstract: A reset circuit incorporated into a latch circuit which comprising a follow portion and a hold portion and generates an output signal at an output terminal in response to an input data signal and a clock signal. A reset signal is applied, via a diode, to the output terminal which causes the output terminal to immediately assume the state of the reset signal without any intervening gate delay.
    Type: Grant
    Filed: June 26, 1989
    Date of Patent: November 13, 1990
    Assignee: Gazelle Microcircuits, Inc.
    Inventors: Mark E. Fitzpatrick, Gary R. Gouldsberry, Yat-Sum Chan, Richard F. Pang
  • Programmable connection path circuit
    Patent number: 4897836
    Abstract: A multiplexing type circuit includes circuit portions having input and output leads associated therewith, to allow testing of the individual circuit portions, and further includes laser programmable fuses which allow selective disconnection of certain input and output leads as chosen to disconnect circuit portions from the overall circuit as appropriate.
    Type: Grant
    Filed: October 20, 1987
    Date of Patent: January 30, 1990
    Assignee: Gazelle Microcircuits, Inc.
    Inventors: Mark E. Fitzpatrick, Yat-Sum Chan, Richard F. Pang, Gary R. Gouldsberry
  • Chopsticks
    Patent number: D448627
    Type: Grant
    Filed: October 24, 2000
    Date of Patent: October 2, 2001
    Assignee: KADO Industrial Company Limited
    Inventor: Chik Sum Chan
  • Container
    Patent number: D515362
    Type: Grant
    Filed: October 25, 2004
    Date of Patent: February 21, 2006
    Assignee: Kado Industrial Co., Ltd.
    Inventor: Chik Sum Chan
  • Set of condiment containers
    Patent number: D470017
    Type: Grant
    Filed: November 19, 2001
    Date of Patent: February 11, 2003
    Assignee: Kado Industrial Co., Ltd.
    Inventor: Chik Sum Chan
  • Container for tie tamer
    Patent number: D479462
    Type: Grant
    Filed: September 19, 2002
    Date of Patent: September 9, 2003
    Assignee: Kado Industrial Company Limited
    Inventor: Chik Sum Chan
  • Container with tie tamers
    Patent number: D391393
    Type: Grant
    Filed: March 31, 1997
    Date of Patent: March 3, 1998
    Assignee: Kado Industrial Company Limited
    Inventor: Chik Sum Chan
  • Shaker
    Patent number: D408687
    Type: Grant
    Filed: December 10, 1997
    Date of Patent: April 27, 1999
    Assignee: Kado Industrial Company Limited
    Inventor: Chik Sum Chan
  • Container
    Patent number: D426769
    Type: Grant
    Filed: June 16, 1999
    Date of Patent: June 20, 2000
    Assignee: Kado Industrial Company, Ltd.
    Inventor: Chik Sum Chan