Patents by Inventor Dat Nguyen

Dat Nguyen 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: 20070134570
    Abstract: A photoconductor with a charge transport layer having about 20-25% by weight of 4-N,N-bis(4-methylphenyl)-amino-benzaldehyde-N?,N?-diphenylhydrazone is in an essentially standard resin binder, such as a polycarbonate resin binder. Electrical characteristics are those of the larger amounts using conventional charge transport agents, and the larger amount of binder provides much improved wear resistance and consequently longer useful life of the photoconductor. Charge transport layers with only the foregoing bis-methyl material do exhibit moderate fatigue upon exposure to light. However, this can be overcome by adding 0.5% or less of a fluorenyl-azine as a light absorber, specifically 9-(p-diethylaminobenzylidenehydrazono)fluorene, in the charge transport layer. No antioxidant is required for electrical stability improvement.
    Type: Application
    Filed: December 14, 2005
    Publication date: June 14, 2007
    Inventors: James Hartman, Laura Kierstein, Dat Nguyen, Ronald Levin, Weimei Luo-Gheleta, Tanya Thames
  • Publication number: 20070092109
    Abstract: A method of tracking a moving object by an emissivity of the moving object including receiving first frame data containing emissivity image data of an emissivity from the moving object within a scene, extracting characterization image data from the first frame data that represents edges and gradients of the emissivity, and analyzing the characterization image data for tracking information.
    Type: Application
    Filed: November 27, 2002
    Publication date: April 26, 2007
    Inventors: Harry Lee, Dat Nguyen
  • Publication number: 20070068344
    Abstract: The disclosure is directed to a process for producing separable iron and titanium oxides from an ore containing titanium oxide and ferric oxide, comprising: (a) forming agglomerates comprising carbon-based materials and the ore, the quantity of carbon of the agglomerates being sufficient for, at an elevated temperature, reducing ferric oxide to ferrous oxide and forming a ferrous oxide-rich molten slag, (b) introducing the agglomerates onto a carbon bed of a moving hearth furnace; (c) heating the agglomerates in the moving hearth furnace to a temperature sufficient for reducing and melting the agglomerates to produce a ferrous oxide-rich molten slag; (d) metallizing the ferrous oxide of the molten slag by reaction of the ferrous oxide and the carbon of the carbon bed at a furnace temperature sufficient for maintaining the slag in a molten state; and (e) solidifying the slag after metallization of the ferrous oxide to form a matrix of titanium oxide-rich slag having a plurality of metallic iron granules distri
    Type: Application
    Filed: August 30, 2006
    Publication date: March 29, 2007
    Inventors: John Barnes, Stephen Lyke, Dat Nguyen, Akira Uragami, Isao Kobayashi, Mitsutaka Hino
  • Publication number: 20060173647
    Abstract: According to one embodiment of the invention a method for determining the location of a potential defect in a device includes scanning a surface of the device with a temperature sensor while operating the device. The method also includes measuring a temperature of the device by a temperature sensor at a plurality of locations while scanning. Based upon the measured temperatures, a temperature profile is constructed for the device. The method also includes comparing the constructed temperature profile to a reference profile to determine a location of the potential defect in the device.
    Type: Application
    Filed: February 2, 2005
    Publication date: August 3, 2006
    Inventor: Dat Nguyen
  • Publication number: 20060120368
    Abstract: IGMP is a protocol for managing and controlling multicast of data streams to a plurality of end users connected to a telecommunications network through an access system. A novel implementation of IGMP for multicasting data streams in an XDSL access network system is disclosed. DSLAM (Digital Subscriber Line Asynchronous Multiplexer) or ASAM (ATM Subscriber Access Multiplexer) is used in the access network system and interfaces between the telecommunications network and the plurality of end users. IGMP signals are terminated at LT (Line Termination). A better scalability of the access system can be achieved, resulting in increased numbers of end users.
    Type: Application
    Filed: December 8, 2004
    Publication date: June 8, 2006
    Applicant: ALCATEL
    Inventors: Bakri Aboukarr, Dat Nguyen, Allan Poulsen
  • Publication number: 20050246344
    Abstract: A computer implemented method comprising receiving a list of one or more contact points from a sender and comparing the list of one or more contact points to a satellite server's do-not-contact list. Any contact point on the list of one or more contact points that appears on the satellite server's do-not-contact list is reported to the sender. The satellite server's do-not-contact list is generated from a do-not-contact list distributed by a master server. A registrant registers with the master server to provide a registrant contact point to be on the do-not-contact list to be distributed by the master server. The contact points in the registry may be organized in a hierarchy with preferences at one or more levels.
    Type: Application
    Filed: April 29, 2004
    Publication date: November 3, 2005
    Inventors: Arthur Keller, Lee Holloway, John Rodrigues, Dat Nguyen, Thomas Belote, Matthew Prince
  • Publication number: 20050002398
    Abstract: An xDSL access system initiates an ATM point-to-multipoint connection with a source connected to the ATM network responsive to an IGMP control message received from one of the end user systems requesting a particular data stream. The source formats the data stream into IP packets having an IP multicast address. These IP packets are first encapsulated into Ethernet frames and then the source ATM encapsulates the Ethernet frames into ATM cells and launches the cells into the ATM network. The xDSL access system receives these cells over the ATM point-to-multipoint connection and transmits the cells to the end user system. The end user receives the xDSL modulated signal, reassembles the IP packets from the ATM cells and sends the packets to the end user; and then the end user receives the IP packets and re-formats them into a particular data stream.
    Type: Application
    Filed: June 28, 2004
    Publication date: January 6, 2005
    Inventors: Bakri Aboukarr, Ludwig Pauwels, Dat Nguyen
  • Publication number: 20040251769
    Abstract: An electrical machine, in particular a starter for motor vehicles, with a stator (36) and a rotor (39) is proposed; the rotor has a hollow shaft (63) with various shaft segments. The electrical machine is characterized in that the shaft (63), between a bearing seat (81) and a shaft segment contour (108) for transmitting a torque, is a one-piece tube.
    Type: Application
    Filed: August 6, 2004
    Publication date: December 16, 2004
    Inventors: Ngoc-Thach Nguyen, Quang-Ngoc Tran, Holger Roesner, Stefan Ossenkopp, Gerd Kirtsen, Quoc-Dat Nguyen
  • Patent number: 6636372
    Abstract: Systems and methods for accumulating data relating to the performance of one or more components of a read channel are described. In one aspect, a programmable channel quality monitor is operable to accumulate performance data corresponding to a recorded test data sequence spanning two or more data sectors of the magnetic medium. The channel quality monitor preferably is incorporated in a disk drive system. A method of accumulating performance data from a read channel also is described. In accordance with this inventive method, an original test data pattern is written to multiple data sectors of the magnetic medium. The original test pattern is read from the multiple data sectors of the magnetic medium to produce a readback test pattern. In this method, performance data relating to a comparison of the original test pattern and the readback test pattern is accumulated.
    Type: Grant
    Filed: April 17, 2000
    Date of Patent: October 21, 2003
    Assignee: Infineon Technologies North America Corp.
    Inventors: Dat Nguyen, James Wilson Rae
  • Publication number: 20030049711
    Abstract: The instant invention provides nucleic acid molecules encoding insect 26/29 cysteine protease, as well as 26/29 cysteine protease encoded thereby. The invention further provides methods of identifying agents that modulate a level of 26/29 cysteine protease mRNA, polypeptide, or enzyme activity. Such agents are candidate insecticidal compounds.
    Type: Application
    Filed: June 26, 2002
    Publication date: March 13, 2003
    Inventors: Allen J. Ebens, Thomas J. Stout, Stuart Johnston, Dat Nguyen
  • Patent number: 6469549
    Abstract: The present invention provides a method and/or circuit for achieving a near 50 percent duty cycle divide-by-odd-integer output of an input reference clock.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: October 22, 2002
    Assignee: Infineon Technologies AG
    Inventors: Michael Carson, Dat Nguyen
  • Patent number: 6445832
    Abstract: A method and apparatus are described for tracking an object image in an image sequence in which a template window associated with the object image is established from a first image in the image sequence and an edge gradient direction extracted. A search window associated with the object image is established from a second image in the image sequence and a second edge gradient direction associated with the search window extracted. The first and second edge gradient directions are weighted and correlated to provide a coordinate offset between relative positions of the object image in the search and template windows to track the object image in the image sequence. If the coordinate offset exceeds a predetermined value the template window is updated by establishing a new template window.
    Type: Grant
    Filed: October 10, 2000
    Date of Patent: September 3, 2002
    Assignee: Lockheed Martin Corporation
    Inventors: Harry C. Lee, Dat Nguyen
  • Publication number: 20020063587
    Abstract: The present invention provides a method and/or circuit for achieving a near 50 percent duty cycle divide-by-odd-integer output of an input reference clock.
    Type: Application
    Filed: November 30, 2000
    Publication date: May 30, 2002
    Inventors: Michael Carson, Dat Nguyen
  • Patent number: 5458220
    Abstract: A balustrade for a passenger conveying device is provided comprising a handrail, a plurality of balustrade panels, a base, and a clamp. The balustrade panels support the handrail. The base includes a skirt panel, apparatus for supporting the balustrade panels, and an inner decking for enclosing a portion of the support apparatus. The clamp, which includes a fastener and a biasing apparatus, attaches the inner decking to the skirt panel.
    Type: Grant
    Filed: July 1, 1994
    Date of Patent: October 17, 1995
    Assignee: Otis Elevator Company
    Inventors: Dat Nguyen, James Rivera, Dale Barrett
  • Patent number: 5381687
    Abstract: An escalator combplate is equipped with a stop switch that will interrupt the power to the escalator when objects trapped between the stop treads and combplate impose a predetermined lifting force on the combplate. The necessary lifting force is determined by code requirements, and the combplate is subjected to an upward spring force which equals the code-dictated lifting force. While the combplate is being lifted by the spring force, the stop switch or switches are set so that they will actuate at the calibrated position of the combplate. The spring force is then removed to allow the combplate to settle back to its normal operating position.
    Type: Grant
    Filed: October 19, 1992
    Date of Patent: January 17, 1995
    Assignee: Otis Elevator Company
    Inventors: Dat Nguyen, James A. Rivera
  • Patent number: 5307918
    Abstract: A power switch assembly is operably connected to the combplate of an escalator for selectively shutting off the escalator in the event of entrapment of some object between the steps and combplate. When an object becomes wedged between the steps and combplate, the latter will be lifted or pushed upwardly away from the steps. The upward movement of the combplate operates a power interruption switch to stop further movement of the steps and handrail. The combplate is supported on the truss by spring assemblies which serve to effectively lower the weight of the combplate so that upward movement of the latter is more readily accomplished. The assembly can be retrofitted onto older existing escalators with heavier combplates than are found in newer equipment.
    Type: Grant
    Filed: September 15, 1992
    Date of Patent: May 3, 1994
    Assignee: Otis Elevator Company
    Inventors: James A. Rivera, Dat Nguyen
  • Patent number: 5180047
    Abstract: The balustrade and decks of an escalator or moving walkway are mounted on a conveyor truss via a plurality of anchor brackets which are welded to the truss at spaced apart locations thereon. Template brackets are secured to each anchor bracket to define the location of the outer deck, the inner top shirt panel, the balustrade clamps, and the return path handrail guides. Skirt jack bolt mounts are mounted on the anchor brackets below the return path of the handrail and are operable to provide for proper positioning of the inner side skirt panels relative to the steps. The handrail can be easily released from its return guides and removed from the interior of the decking by removing the inner top skirt panel. The assembly can be easily erected in the field and readily serviced.
    Type: Grant
    Filed: April 7, 1992
    Date of Patent: January 19, 1993
    Assignee: Otis Elevator Company
    Inventors: Dale R. Barrett, Dat Nguyen, Frank M. Sansevero
  • Patent number: 5131521
    Abstract: A moving handrail on an escalator or the like is driven by pairs of rollers which form a nip through which the handrail moves. The rollers are eccentrically mounted so as to automatically tighten the nip in response to resistance to movement of the handrail. The roller or rollers which contact the underside of the handrail are rotatably driven by power sprockets, while the roller or rollers contacting the outer or exposed surface of the handrail are idler rollers which are not rotated by the power sprockets so as to lessen scuffing of the exposed surface of the handrail by the rollers.
    Type: Grant
    Filed: September 9, 1991
    Date of Patent: July 21, 1992
    Assignee: Otis Elevator Company
    Inventors: Gerald E. Johnson, James A. Rivera, Frank M. Sansevero, Dat Nguyen
  • Patent number: 5062520
    Abstract: The handrail drive has opposed rollers which are movable toward and away from each other due to their eccentric mountings. Two sets of such opposed rollers are used to drive the handrail. Each set of rollers is equipped with its own drive chain to increase the efficiency of each set of drive rollers with ultra high loads. The drive is particularly suited for moving high load escalator and moving walkway handrails.
    Type: Grant
    Filed: July 11, 1990
    Date of Patent: November 5, 1991
    Assignee: Otis Elevator Company
    Inventors: Dat Nguyen, Frank Sansevero, Gerald E. Johnson, James A. Rivera
  • Patent number: D348757
    Type: Grant
    Filed: July 9, 1993
    Date of Patent: July 12, 1994
    Assignee: Otis Elevator Company
    Inventors: James A. Rivera, Dat Nguyen, Dale R. Barrett, Gerald E. Johnson