Patents by Inventor Wai Cheng

Wai Cheng 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: 20080315684
    Abstract: The present invention relates a dynamic voltage restorer (DVR) system and methods for addressing voltage dips. The instant DVR incorporates high frequency technology, such as a high frequency transformer, to generate a square wave voltage from a storage device, such square wave being modulated prior to being delivered to a load. The generation of the square wave and modulation thereto creates a voltage that reacts fast to voltage dips, while addressing wide ranging harmonics usually present in square waves.
    Type: Application
    Filed: June 25, 2007
    Publication date: December 25, 2008
    Applicant: The Hong Kong Polytechnic University
    Inventors: Eric Ka Wai Cheng, Siu Lau Ho, Kit Po Wong
  • Patent number: 7389518
    Abstract: According to the invention, a changer with a tray loading mechanism, wherein a tray holding a recording medium is transported from a storage position to a playback position and vice versa with a transport hook, which engages a recess of the tray, has a transport hook which is provided with a torsion spring for rotating the transport hook from a tray grabbing position into a tray transport position, wherein the transport hook can be rotated into the tray grabbing position in mid-travel.
    Type: Grant
    Filed: December 19, 2003
    Date of Patent: June 17, 2008
    Assignee: Thomson Licensing
    Inventors: Yat Fung Chan, Kwok Wai Cheng, Wei Cui, Eng Choon Low, Tony Ho
  • Patent number: 7381483
    Abstract: A magnetic core is made of a composite magnetic material having a relative permeability of between 1 and 29 at a frequency range from 20 kHz to 2.5 MHz. The composite magnetic material consists of cobalt and nickel particles having an average diameter in the range of 1 to 100 micrometers, and a polymer base binding the particles to form a core.
    Type: Grant
    Filed: October 27, 2004
    Date of Patent: June 3, 2008
    Assignee: The Hong Kong Polytechnic University
    Inventors: Ka Wai Eric Cheng, Chak Yin Tang, David Ki Wai Cheng, Hang Wu
  • Publication number: 20080115442
    Abstract: The present invention relates to a composite sandwich wall panel comprising: at least two fine sand gypsum or concrete panels (I) in each of which a glass fiber web (2) is disposed at center, and at least one polystyrene panel (3), which are bonded alternatively. The surface layer and the bottom layer are the fine sand gypsum or concrete panels, and according to the requirement, the wall panel can be produced to have three or more layers of composite panels. The wall panel of the present invention has advantages of light weight, easy installation, strong loading capacity, no seam crack, no plaster, and good performance of thermal insulation, sound insulation and fireproof as well as it is suitable for internal wall and external wall.
    Type: Application
    Filed: January 14, 2004
    Publication date: May 22, 2008
    Inventor: Chi Wai Cheng
  • Publication number: 20070266701
    Abstract: A method and system is disclosed for regenerating a particulate filter for an exhaust system. A source of hydrocarbon is injected into the exhaust flow upstream of the filter. The injected hydrocarbon within the filter is caused to oxidize and a temperature within the filter to rise, the temperature rise being initiated at a downstream end of the filter. A temperature change at the filter is sensed in response to the oxidation of the hydrocarbon. The amount of hydrocarbon being injected into the filter is adjusted to increase the temperature within the filter above a defined threshold from the downstream end to an upstream end of the filter, the defined threshold temperature being sufficient to oxidize soot. An operational parameter indicative of the filter regeneration being complete is sensed, and further injection of the hydrocarbon into the exhaust flow is prevented in response to the sensed operational parameter.
    Type: Application
    Filed: August 3, 2007
    Publication date: November 22, 2007
    Applicant: GM GLOBAL TECHNOLOGY OPERATIONS, INC.
    Inventor: Shi-Wai Cheng
  • Publication number: 20070195516
    Abstract: A decorative bulb chain including a plurality of bulb chain units, which can be connected one another electrically in a detachable manner, is provided. Various shapes of the tree branches can be realized by connecting the respective bulb chain units in series, in parallel, or in combination thereof, or by way of false threads. The mounting and removal of the decorative bulb chain of the present invention are very easy, and wire tangling easily avoided.
    Type: Application
    Filed: February 23, 2006
    Publication date: August 23, 2007
    Inventor: Chung Wai Cheng
  • Publication number: 20070163233
    Abstract: A particulate sensor for sensing the presence of particulates in a gas flow stream is disclosed. The particulate sensor includes a housing having a flow divider to provide a first flow path and a second flow path. A heater is disposed and configured to provide uniform heating of the two flow paths. A first temperature sensor is disposed in the first flow path downstream of the heater. A second temperature sensor is disposed in the second flow path downstream of the heater. A fine filter is disposed within the second flow path and is configured to trap carbonaceous particulates.
    Type: Application
    Filed: January 19, 2006
    Publication date: July 19, 2007
    Inventor: Shi-Wai Cheng
  • Publication number: 20070121321
    Abstract: A decorative light system includes a frame assembly, a background assembly, and a light assembly. The frame assembly includes a frame, which is the skeletal framework of the light system. The background assembly includes a reflective surface and a support member; the reflective surface provides a reflective decorative background and the support member supports reflective surface, if need be, and the light assembly. The light assembly includes a plurality of bulb assemblies and attendant wiring, each bulb assembly having a light source and a socket. Each bulb assembly is inserted through a slit/aperture in the background assembly, and is positioned approximately parallel to the reflective surface of the background assembly providing a flat profile.
    Type: Application
    Filed: November 28, 2006
    Publication date: May 31, 2007
    Applicant: Cindex Holdings Limited (a Hong Kong corporation)
    Inventor: Chung-wai Cheng
  • Publication number: 20070044458
    Abstract: A particulate filter for an exhaust system configured to receive an exhaust flow is disclosed. The filter includes a wall-flow filtration element having a first regeneration zone and a second regeneration zone, the first zone being downstream of the second zone, and a heat source disposed at the first regeneration zone. In response to demand for regeneration, the wall-filtration element regenerates according to a staged regeneration such that the first zone initiates regeneration ahead of the second zone, and each zone regenerates in the direction of the exhaust flow.
    Type: Application
    Filed: January 19, 2006
    Publication date: March 1, 2007
    Inventor: Shi-Wai Cheng
  • Publication number: 20060274556
    Abstract: The present invention is a lamp system for use in a light string system comprising a light assembly and a socket assembly. The light assembly comprises a light source, a base in communication with the light source, and a bypass activating system. The socket assembly comprises a socket adapted to receive the light assembly and a bypass mechanism having a first position and a second position. The bypass activating system is adapted to move the bypass mechanism between the first and second positions.
    Type: Application
    Filed: June 23, 2006
    Publication date: December 7, 2006
    Applicant: GP Ltd.
    Inventors: Joseph Massabki, Gary Lawson, Chung-wai Cheng
  • Publication number: 20060156702
    Abstract: A particulate filter for an exhaust system configured to manage an exhaust flow is disclosed. The particulate filter includes a housing and a wall-filtration element contained therein. The wall-flow filtration element has an inlet end and an outlet end, the outlet end having a first end-plug. The wall-flow filtration element has pores defining a porosity sufficient to trap exhaust particulates and to pass ash particles, including the first end-plug having a pore size equal to or greater than 55 micrometers and equal to or less than 250 micrometers.
    Type: Application
    Filed: December 30, 2005
    Publication date: July 20, 2006
    Inventor: Shi-Wai Cheng
  • Publication number: 20060123771
    Abstract: A lean NOx trap operating in a lean NOx exhaust stream is progressively regenerated, sector to sector, for efficient operation of the trap and conservation of reducing gas used in the regeneration. A reductant gas distributor is inserted in the exhaust upstream of the trap. Reductant gas is carried into the exhaust duct through a conduit portion and the reductant gas stream diverged and directed through a distributor into selected cells of the trap. The NOx in the selected cells is reduced to N2 while lean NOx exhaust continues to flow through the remainder of the trap. By relative movement of the reductant gas distributor and the trap, the entire trap is progressively and continually regenerated while still preforming as a NOx trap.
    Type: Application
    Filed: December 10, 2004
    Publication date: June 15, 2006
    Inventor: Shi-Wai Cheng
  • Publication number: 20050171906
    Abstract: The present invention relates to a system for application in an automatic vending machine for self-service recording and reproduction of sound and moving images on the spot in the format of video compact discs (VCDs), digital video discs (DVDs) or other recording discs, taking photo shots and printing photos or photo stickers with still images taken or from pre-recorded memory cards without the assistance of a photographer or technician. The automatic vending machine accepts different methods of payment and can be adapted to accept new forms of electronic payment and to apply new means of data recording and reproduction without changing other parts and components of the automatic vending machine.
    Type: Application
    Filed: January 31, 2004
    Publication date: August 4, 2005
    Inventors: Hiu Sean Shek, Wai Cheng
  • Publication number: 20050099828
    Abstract: A power converter for operating with an alternate current power source, including a storage capacitive means and a transformer, said storage capacitive means being adapted for power factor correction, said transformer including an input for connecting to an alternating current power source and at least a first output and a second output respectively for connecting to said storage capacitive means and the load, said transformer including input windings, first output windings and second output windings which are respectively connected to said input, said first and second outputs wherein said transformer and said storage capacitive means being adapted that the voltage across said storage capacitive means being related to the voltage of said first output of said transformer.
    Type: Application
    Filed: November 12, 2003
    Publication date: May 12, 2005
    Applicant: THE HONG KONG POLYTECHNIC UNIVERSITY
    Inventors: Ki-Wai Cheng, Yim Lee, Dah-Chuan Lu
  • Publication number: 20050087164
    Abstract: An intake valve for a combustion engine having an intake port is disclosed. The intake valve includes a valve guide having an end proximate the intake port, a valve shield extending from the end of the valve guide and into the intake port, and a valve stem arranged proximate the valve guide and valve shield. The valve guide and valve stem define a first clearance dimension therebetween, and the valve shield and valve stem define a second clearance dimension therebetween, wherein the second clearance dimension is equal to or greater than the first clearance dimension.
    Type: Application
    Filed: October 22, 2003
    Publication date: April 28, 2005
    Inventor: Shi-Wai Cheng
  • Publication number: 20050091020
    Abstract: A new way of applying the compartmental approach to the simulation of multi-stage separation processes in the process industry leads to more robust simulation models and higher success rate. The new approach makes use of steady-state component balances, constant vapor-liquid equilibrium ratios, and initialization models. Guidelines are provided for creating a computer executable regular model of the multi-stage separation process. Guidelines are also provided for creating a computer executable model that solves the problem of initialization failure of the regular model for the process.
    Type: Application
    Filed: October 27, 2003
    Publication date: April 28, 2005
    Inventor: Wai Cheng
  • Publication number: 20050050870
    Abstract: A particulate filter for an exhaust system configured to manage an exhaust flow includes a housing and a wall-flow filtration element contained within the housing. The wall-flow filtration element is configured to trap exhaust particulates and to pass ash particles.
    Type: Application
    Filed: March 3, 2003
    Publication date: March 10, 2005
    Inventor: Shi-Wai Cheng
  • Publication number: 20040168176
    Abstract: According to the invention, a changer with a tray loading mechanism, wherein a tray holding a recording medium is transported from a storage position to a playback position and vice versa with a transport hook, which engages a recess of the tray, has a transport hook which is provided with a torsion spring for rotating the transport hook from a tray grabbing position into a tray transport position, wherein the transport hook can be rotated into the tray grabbing position in mid-travel.
    Type: Application
    Filed: December 19, 2003
    Publication date: August 26, 2004
    Inventors: Yat Fung Chan, Kwok Wai Cheng, Wei Cui, Eng Choon Low, Tony Ho
  • Publication number: 20030235705
    Abstract: A compound for a composite magnetic material having low permeability and low loss magnetic properties includes a polymer resin bonding agent and a filler comprising one or more ferromagnetic materials. The ferromagnetic materials are Cobalt and Nickel particles having an average diameter of less than 100 micrometers. The particles are coated with a titanic coupling agent to facilitate disbursement through the resin and increase the bond strengthen between the particles and the resin.
    Type: Application
    Filed: June 24, 2002
    Publication date: December 25, 2003
    Applicant: The Hong Kong Polytechnic University
    Inventors: Ka Wai Eric Cheng, Chak Yin Tang, David Ki-Wai Cheng, Hang Wu
  • Publication number: 20030095567
    Abstract: A Real Time Protocol (RTP) packet handler includes a protocol processor (44) coupled to a communications medium (26) and a central processing unit (CPU) (46). The protocol processor (44) receives IP packets (24) transmitted over the communications medium (26). Operating system (OS) software executing on the CPU (46) controls the operation of the protocol processor (44) via a host interface (57) and a dual port RAM (58). A switch (50) routes RTP type IP packets to a RTP handler module (48) running on the protocol processor (44). The RTP packet handler module (48) processes RTP packets. Non-RTP packets are processed by the OS software (46).
    Type: Application
    Filed: November 20, 2001
    Publication date: May 22, 2003
    Inventors: Man Kuk Lo, Hing Leung Yiu, Kwok Wai Cheng