Patents by Inventor Gang A. Xiao

Gang A. Xiao 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: 20100150192
    Abstract: A laser pump cavity includes a heat sink holder with a central through hole, a plurality of slot portions, and a plurality of single emitters. The single emitter includes a heat sink and a single core disposed on the heat sink. The slot portions are uniformly spaced and surround the through hole. The single emitters are connected end to end, thereby forming at least one single emitter array. The at least one single emitter array is disposed in corresponding slot portions with each single core facing the through hole.
    Type: Application
    Filed: December 12, 2006
    Publication date: June 17, 2010
    Inventors: Gang Pu, Gang Xiao, Jlanfei Chen, Yanqing Yang, Yunfeng Gao
  • Publication number: 20100118892
    Abstract: An apparatus for wireless communication includes a processing system. The processing system is configured to perform a first set of functions in a first thread. The first set of functions includes obtaining second data from a second thread and providing first data to the second thread to facilitate construction of an uplink packet in the second thread. The processing system is further configured to perform a second set of functions in the second thread. The second set of functions includes obtaining the first data, constructing the uplink packet based on the first data, and providing the second data to the first thread to facilitate the performing of the first set of functions.
    Type: Application
    Filed: November 10, 2009
    Publication date: May 13, 2010
    Applicant: QUALCOMM INCORPORATED
    Inventors: Bao V. Nguyen, Vanitha A. Kumar, Srividhya Krishnamoorthy, Shailesh Maheshwari, Ashwini Raina, Yateesh S. Gowda, Gang A. Xiao
  • Publication number: 20100034095
    Abstract: This innovation relates to systems and methods for transmission of protocol data units, and more particularly to processing polling requests from a radio link control peer. A radio link control transmitter can poll a receiver to obtain a report regarding the status of a set of data packets, and the polls can be sent in-band with a data packet. The receiver can determine to wait before sending the status report based on one or more characteristics of the received data packets.
    Type: Application
    Filed: August 6, 2009
    Publication date: February 11, 2010
    Applicant: QUALCOMM INCORPORATED
    Inventors: Sai Yiu Duncan Ho, Gang A. Xiao
  • Publication number: 20100034187
    Abstract: Systems and methodologies are described herein that facilitate efficient handling of packets (e.g., Packet Data Convergence Protocol (PDCP) Protocol Data Units (PDUs) or Service Data Units (SDUs)) in a wireless communication system. As described herein, a number of consecutive packets that are discarded due to a discard timer expiration event and/or other causes can be monitored and compared to a number of tolerated consecutive discarded packets. If the number of consecutive discarded packets does not exceed the number of tolerated consecutive packets, conventional processing operations such as header modification and compression, ciphering, or the like can be omitted for respective packets subsequent to a discarded packet, thereby significantly reducing processing overhead. As further described herein, the number of tolerated consecutive discarded packets can be chosen to maintain header compression (e.g.
    Type: Application
    Filed: August 6, 2009
    Publication date: February 11, 2010
    Applicant: QUALCOMM INCORPORATED
    Inventors: Vanitha A. Kumar, Bin Qiu, Ashwini Raina, Shailesh Maheshwari, Gang A. Xiao, Yateesh S. Gowda
  • Publication number: 20090268683
    Abstract: Systems and methodologies are described that facilitate formation and/or dispatch of radio link control (RLC) protocol status reports to a base station. The system can include components that quantify an absence of protocol data units, ascertain whether a number of absent protocol data units exceeds the size of a transmission side grant, insert a sequence number associated with a first absent protocol data unit into an acknowledgement sequence number field associated with a partial status report, incorporates the sequence number associated with the first absent protocol data unit in the partial status report, includes sequence numbers of subsequent absent protocol data units into the partial status report without exceeding the transmission side grant, and sends the partial status report to the base station.
    Type: Application
    Filed: April 27, 2009
    Publication date: October 29, 2009
    Applicant: QUALCOMM Incorporated
    Inventors: Sai Yiu Duncan Ho, Ashwini Raina, Gang A. Xiao, Shailesh Maheshwari, Vanitha A. Kumar
  • Publication number: 20090038990
    Abstract: The present invention relates to a catalyst used for converting coal tar to diesel, the preparation method and use thereof The catalyst has a compound of iodine, an inorganic oxide matrix and the compound dispersed therein; or an inorganic oxide matrix and the compound dispersed therein together with a crystalline aluminosilicate zeolite, and relates to a method of coal tar converse to diesel in which at least one of the catalysts are used by dispersing an iodine compound in an inorganic oxide matrix.
    Type: Application
    Filed: August 7, 2008
    Publication date: February 12, 2009
    Applicant: HANERGY TECH CO., LTD.
    Inventors: Gang XIAO, Xiaofeng HOU, Tao YAN, Hongxia SHI
  • Patent number: 7192491
    Abstract: In order to dampen magnetization changes in magnetic devices, such as magnetic tunnel junctions (MTJ) used in high speed Magnetic Random Access Memory (MRAM), a transition metal selected from the 4d transition metals and 5d transition metals is alloyed into the magnetic layer to be dampened. In a preferred form, a magnetic permalloy layer is alloyed with osmium (Os) in an atomic concentration of between 4% and 15% of the alloy.
    Type: Grant
    Filed: July 15, 2002
    Date of Patent: March 20, 2007
    Assignee: International Business Machines Corporation
    Inventors: Snorri T. Ingvarsson, Roger H. Koch, Stuart S. Parkin, Gang Xiao
  • Patent number: 7145330
    Abstract: A scanning magnetic microscope SMM (20) includes a sensor (10) for sensing a magnetic field generated by a specimen (78), the sensor including one of a MTJ, a GMR, or an EHE sensor; translation apparatus (22A–C, 52) for translating the sensor relative to a surface of sad specimen; and a data processor (50), having an input coupled to an output of said sensor, for constructing an image of said magnetic field. The sensor preferably includes one to three sensing units each defining a sensing axis for sensing a component of a magnetic field from a specimen, the sensing units disposed such that the sensing axes are orthogonal to one another. Pluralities of such sensors can be disposed in two or three dimensional arrays. The SMM can be used for examining the current flow in ICs, electromigration, magnetic data storage media, biomagnetic systems and magnetic ink used to print currency.
    Type: Grant
    Filed: August 14, 2003
    Date of Patent: December 5, 2006
    Assignee: Brown University Research Foundation
    Inventor: Gang Xiao
  • Patent number: 6930479
    Abstract: A scanning magnetic microscope (SMM) (20) includes a current source (27) for imposing an excitation current to a conductor-under-test (CUT) (70) and, if applicable, a reference current to a proximally located reference conductor (72). During accelerated testing, the SMM (20) corrects thermal drift of the CUT (70) via the reference conductor (72). A sensor (21) may be cooled by a heat sink (31) such as a pump (33) directing an airstream or a coldfinger (80). The sensor may switch from a contact to a non-contact mode of scanning the CUT (70). The SMM (20) and methods are useful for measuring electromigration in a CUT (70) as it occurs, for assembling the images into time lapsed representations such as a shape of the CUT (70), for measuring electromigration as a function of a cross sectional area of a wire under a dielectric material (DM) (78), for determining electrical parameters of the CUT (70), and for optimizing a thickness of a DM (78) over a CUT (70).
    Type: Grant
    Filed: March 7, 2003
    Date of Patent: August 16, 2005
    Assignee: Brown University Research Foundation
    Inventors: Gang Xiao, Benaiah D. Schrag
  • Publication number: 20040239318
    Abstract: A scanning magnetic microscope (SMM) 20 includes a current source 27 for imposing an excitation current to a conductor-under-test (CUT) 70 and, if applicable, a reference current to a proximally located reference conductor 72. During accelerated testing, the SMM 20 corrects thermal drift of the CUT 70 via the reference conductor 72. A sensor 21 may be cooled by a heat sink 31 such as a pump 33 directing an airstream or a coldfinger 80. The sensor may switch from a contact to a non-contact mode of scanning the CUT 70. The SMM 20 and methods are useful for measuring electromigration in a CUT 70 as it occurs, for assembling the images into time lapsed representations such as a shape of the CUT 70, for measuring electromigration as a function of a cross sectional area of a wire under a dielectric material (DM) 78, for determining electrical parameters of the CUT 70, and for optimizing a thickness of a DM 78 over a CUT 70.
    Type: Application
    Filed: April 28, 2004
    Publication date: December 2, 2004
    Inventors: Gang Xiao, Benaiah D Schrag
  • Publication number: 20040207396
    Abstract: A scanning magnetic microscope SMM (20) includes a sensor (10) for sensing a magnetic field generated by a specimen (78), the sensor including one of a MTJ, a GMR, or an EHE sensor; translation apparatus (22A-C, 52) for translating the sensor relative to a surface of sad specimen; and a data processor (50), having an input coupled to an output of said sensor, for constructing an image of said magnetic field. The sensor preferably includes one to three sensing units each defining a sensing axis for sensing a component of a magnetic field from a specimen, the sensing units disposed such that the sensing axes are orthogonal to one another. Pluralities of such sensors can be disposed in two or three dimensional arrays. The SMM can be used for examining the current flow in ICs, electromigration, magnetic data storage media, biomagnetic systems and magnetic ink used to print currency.
    Type: Application
    Filed: April 28, 2004
    Publication date: October 21, 2004
    Inventor: Gang Xiao
  • Publication number: 20040196681
    Abstract: Magnetic tunneling junction devices (MTJ) useful for sensing and memory applications and characterized by reduced resistance, magnetic noise, increased sensitivity, and increased magnetoresistance are disclosed herein. A method for fabrication of said MTJ is also disclosed wherein a series of materials are layered upon a substrate under controlled conditions, patterned and subjected to a period of annealing for simultaneously optimizing a plurality of performance parameters.
    Type: Application
    Filed: April 14, 2004
    Publication date: October 7, 2004
    Inventors: Gang Xiao, Xiaoyong Liu
  • Publication number: 20040164840
    Abstract: An EHE magnetic sensor has an alloy of the form Ry[MxN100−x]100−y, M being Fe, Co, Ni, or magnetic alloys that contain Fe, Co or Ni. N is from the fifth or sixth period of the periodic table. If present, R is a rare earth element. In one embodiment, the alloy exhibits a Temperature Coefficient ≦0.003 K−1 in the room temperature region. Various geometric shapes of sensors are presented including one and two-dimensional arrays of sensors for measuring spatial magnetic fields. Vias (98, 100, 102, 104) defined by a substrate (92) onto which an alloy layer (106) is disposed are filled with a conductive material in certain embodiments of arrays. Methods are disclosed for making a sensor, for designing a sensor at a thickness, for determining maximum acceptable current through a sensor, for reducing Joule heating of a sensor, and for making an array of sensors.
    Type: Application
    Filed: February 21, 2003
    Publication date: August 26, 2004
    Applicant: Brown University Research Foundation
    Inventors: Gang Xiao, Guo-Xing Miao
  • Patent number: 6756237
    Abstract: Magnetic tunneling junction devices (MTJ) useful for sensing and memory applications and characterized by reduced resistance, magnetic noise, increased sensitivity, and increased magnetoresistance are disclosed herein. A method for fabrication of said MTJ is also disclosed wherein a series of materials are layered upon a substrate under controlled conditions, patterned and subjected to a period of annealing for simultaneously optimizing a plurality of performance parameters.
    Type: Grant
    Filed: March 25, 2002
    Date of Patent: June 29, 2004
    Assignee: Brown University Research Foundation
    Inventors: Gang Xiao, Xiaoyong Liu
  • Patent number: 6657431
    Abstract: A scanning magnetic microscope includes a specimen stage for holding a specimen to be examined; a sensor for sensing a magnetic field generated by the specimen, the sensor including one of a magnetic tunneling junction (MTJ) sensor, a spin valve sensor, or an extraordinary Hall effect sensor; translation apparatus for translating the sensor relative to a surface of said specimen; and a data processor, having an input coupled to an output of said sensor, for constructing an image of said magnetic field. In another embodiment a read/write head from a hard disk drive is shown to make a suitable magnetic sensor. The scanning magnetic microscope can be used for examining the current flow in integrated circuits and related phenomenon, such as electromigration, as well as magnetic data storage media and biomagnetic systems, to mention a few suitable applications.
    Type: Grant
    Filed: June 6, 2001
    Date of Patent: December 2, 2003
    Assignee: Brown University Research Foundation
    Inventor: Gang Xiao
  • Publication number: 20030179511
    Abstract: Magnetic tunneling junction devices (MTJ) useful for sensing and memory applications and characterized by reduced resistance, magnetic noise, increased sensitivity, and increased magnetoresistance are disclosed herein. A method for fabrication of said MTJ is also disclosed wherein a series of materials are layered upon a substrate under controlled conditions, patterned and subjected to a period of annealing for simultaneously optimizing a plurality of performance parameters.
    Type: Application
    Filed: March 25, 2002
    Publication date: September 25, 2003
    Inventors: Gang Xiao, Xiaoyong Liu
  • Publication number: 20030029520
    Abstract: In order to dampen magnetization changes in magnetic devices, such as magnetic tunnel junctions (MTJ) used in high speed Magnetic Random Access Memory (MRAM), a transition metal selected from the 4d transition metals and 5d transition metals is alloyed into the magnetic layer to be dampened. In a preferred form, a magnetic permalloy layer is alloyed with osmium (Os) in an atomic concentration of between 4% and 15% of the alloy.
    Type: Application
    Filed: July 15, 2002
    Publication date: February 13, 2003
    Applicant: International Business Machines Corporation
    Inventors: Snorri T. Ingvarsson, Roger H. Koch, Stuart S.P. Parkin, Gang Xiao
  • Patent number: 6452240
    Abstract: In order to dampen magnetization changes in magnetic devices, such as tunnel junctions (MTJ) used in high speed Magnetic Random Access Memory (MRAM), a transition metal selected from the 4d transition metals and 5d transition metals is alloyed into the magnetic layer to be dampened. In a preferred form, a magnetic permalloy layer is alloyed with osmium (Os) in an atomic concentration of between 4% and 15% of the alloy.
    Type: Grant
    Filed: October 30, 2000
    Date of Patent: September 17, 2002
    Assignee: International Business Machines Corporation
    Inventors: Snorri T. Ingvarsson, Roger H. Koch, Stuart S. Parkin, Gang Xiao
  • Patent number: 6380444
    Abstract: A process for producing an alcohol from a gaseous hydrocarbon, e.g. a lower alkane such as methane, via oxidative reaction of the hydrocarbon in a concentrated sulfuric acid medium in the presence of a catalyst employs an added catalyst comprising a substance selected from iodine, iodine compounds, titanium, titanium compounds, chromiun and chromium compounds.
    Type: Grant
    Filed: June 8, 2000
    Date of Patent: April 30, 2002
    Assignees: Statoil Research Centre
    Inventors: Niels J. Bjerrum, Gang Xiao, Hans Aage Hjuler
  • Publication number: 20020033695
    Abstract: A scanning magnetic microscope includes a specimen stage for holding a specimen to be examined; a sensor for sensing a magnetic field generated by the specimen, the sensor including one of a magnetic tunneling junction (MTJ) sensor, a spin valve sensor, or an extraordinary Hall effect sensor; translation apparatus for translating the sensor relative to a surface of said specimen; and a data processor, having an input coupled to an output of said sensor, for constructing an image of said magnetic field. In another embodiment a read/write head from a hard disk drive is shown to make a suitable magnetic sensor. The scanning magnetic microscope can be used for examining the current flow in integrated circuits and related phenomenon, such as electromigration, as well as magnetic data storage media and biomagnetic systems, to mention a few suitable applications.
    Type: Application
    Filed: June 6, 2001
    Publication date: March 21, 2002
    Inventor: Gang Xiao