Patents by Inventor Chenguang Liu
Chenguang Liu 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).
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Patent number: 9008760Abstract: A system and method for performing off-line analysis of cardiac electrogram data, comprising: retrieving an electrogram from a memory location; identifying a first-channel group of candidate beats from at least a first channel of the electrogram; and identifying a second-channel group of candidate beats from at least a second channel of an electrogram. For each first-channel beat candidate near a second-channel beat candidate, the amplitude of the first-channel beat candidate is compared with the amplitude of a previous beat and the amplitude of a next beat on the first electrogram channel, and first-channel beat candidates that are outside of a first pre-determined range from either the previous or next beat are removed. Then first-channel beat candidates that are outside of a second pre-determined range from either the previous or next beat candidate are removed.Type: GrantFiled: May 30, 2012Date of Patent: April 14, 2015Assignee: Cardiac Pacemakers, Inc.Inventors: Yanting Dong, Shijie Zhang, Deepa Mahajan, Chenguang Liu, Dan Li, Yayun Lin, Derek D. Bohn
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Patent number: 8942791Abstract: A system and method for performing independent, off-line evaluation of event sensing for collected electrograms, comprising: sensing an electrogram using an implantable medical device (IMD); determining locations of heart beats on at least one channel of the electrogram using a multi-pass process, resulting in a group of multi-pass beat locations; storing the electrogram and device-identified beat locations in a memory location; and retrieving the electrogram and device-identified beat locations from the memory location. The multi-pass process determines locations of heart beats on at least a first channel of the electrogram. The device-identified group of beat locations are then compared to the multi-pass group of beat locations identified using the multi-pass method. Based on the comparing step, oversensing of beats, undersensing of beats, or noise from the device can be detected.Type: GrantFiled: May 30, 2012Date of Patent: January 27, 2015Assignee: Cardiac Pacemakers, Inc.Inventors: Yanting Dong, Shijie Zhang, Deepa Mahajan, Chenguang Liu, Dan Li, Yayun Lin, Derek D. Bohn
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Patent number: 8900755Abstract: An electrochemical energy storage device, lithium super-battery, comprising a positive electrode, a negative electrode, a porous separator disposed between the two electrodes, and a lithium-containing electrolyte in physical contact with the two electrodes, wherein the positive electrode comprises a disordered carbon material having a functional group that reversibly reacts with a lithium atom or ion. The disordered carbon material is selected from a soft carbon, hard carbon, polymeric carbon or carbonized resin, meso-phase carbon, coke, carbonized pitch, carbon black, activated carbon, or partially graphitized carbon. In a preferred embodiment, a lithium super-battery having a functionalized disordered carbon cathode and a Li4Ti5O12 anode exhibits a gravimetric energy ˜5-10 times higher than those of conventional supercapacitors and a power density ˜10-30 times higher than those of conventional lithium-ion batteries. This device has the best properties of both the lithium ion battery and the supercapacitor.Type: GrantFiled: September 23, 2010Date of Patent: December 2, 2014Assignee: Nanotek Instruments, Inc.Inventors: Chenguang Liu, Aruna Zhamu, David Neff, Bor Z. Jang
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Patent number: 8889298Abstract: A surface-mediated, lithium ion-exchanging energy storage device comprising: (a) A positive electrode (cathode) comprising a cathode active material that is not a functional material (bearing no functional group reactive with lithium), but having a surface area to capture or store lithium thereon; (b) A negative electrode (anode) comprising an anode active material having a surface area to capture or store lithium thereon; (c) A porous separator disposed between the two electrodes; and (d) A lithium-containing electrolyte in physical contact with the two electrodes, wherein the anode active material and/or the cathode active material has a specific surface area of no less than 100 m2/g in direct physical contact with the electrolyte to receive lithium ions therefrom or to provide lithium ions thereto; wherein at least one of the two electrodes contains therein a lithium source prior to a first charge or a first discharge cycle of the energy storage device.Type: GrantFiled: August 30, 2011Date of Patent: November 18, 2014Assignee: Nanotek Instruments, Inc.Inventors: Aruna Zhamu, ChenGuang Liu, Xiqing Wang, Bor Z. Jang
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Publication number: 20140309760Abstract: The present disclosure relates to a music playback method, a third-party application and a device which are in the field of computer technique. The music playback method includes integrating a background music playback module into a third-party application, receiving a music playing signal in which a playlist identification is included, transmitting the music playing signal to the background music playback module through a predetermined port, acquiring by the background music playback module a corresponding playlist based on the playlist identification of the music playing signal, and randomly playing the music in the playlist by the background music playback module.Type: ApplicationFiled: June 4, 2014Publication date: October 16, 2014Applicant: TENCENT TECHNOLOGY (SHENZHEN) COMPANY LIMITEDInventors: Rong LIU, Shilei LIU, Rong ZHANG, Zhiping FENG, Meng ZHANG, Yanbo MA, Kun ZHANG, Kuiguo WANG, Xiaopeng HUANG, Lei ZHENG, Renkui SHEN, Songlin HE, Chenguang LIU, Wei LIU
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Patent number: 8859143Abstract: A surface-enabled, metal ion-exchanging battery device comprising a cathode, an anode, a porous separator, and a metal ion-containing electrolyte, wherein the metal ion is selected from (A) non-Li alkali metals; (B) alkaline-earth metals; (C) transition metals; (D) other metals such as aluminum (Al); or (E) a combination thereof; and wherein at least one of the electrodes contains therein a metal ion source prior to the first charge or discharge cycle of the device and at least the cathode comprises a functional material or nano-structured material having a metal ion-capturing functional group or metal ion-storing surface in direct contact with said electrolyte, and wherein the operation of the battery device does not involve the introduction of oxygen from outside the device and does not involve the formation of a metal oxide, metal sulfide, metal selenide, metal telluride, metal hydroxide, or metal-halogen compound.Type: GrantFiled: January 3, 2011Date of Patent: October 14, 2014Assignee: Nanotek Instruments, Inc.Inventors: Aruna Zhamu, ChenGuang Liu, David Neff, Bor Z. Jang, Zhenning Yu
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Patent number: 8831287Abstract: A computer implemented method for sensing occupancy of a workspace includes creating a difference image that represents luminance differences of pixels in past and current images of the workspace resulting from motion in the workspace, determining motion occurring in regions of the workspace based on the difference image, and altering a workspace environment based at least in part on the determined motion. The method also includes determining which pixels in the difference image represent persistent motion that can be ignored and determining which pixels representing motion in the difference image are invalid because the pixels are isolated from other pixels representing motion.Type: GrantFiled: June 8, 2012Date of Patent: September 9, 2014Assignee: Utah State UniversityInventors: Aravind Dasu, Dean Mathias, Chenguang Liu, Randy Christensen, Bruce Christensen
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Publication number: 20140226867Abstract: A computer-implemented method for monitoring and controlling a controlled space. The method includes partitioning a controlled space into one or more regions; evaluating motion within the controlled space; determining occupancy within the one or more regions. The method may also include adjusting conditions within the controlled space based on whether the controlled space, or a specific region thereof, is occupied. Corresponding devices and systems are also disclosed herein.Type: ApplicationFiled: July 19, 2012Publication date: August 14, 2014Applicant: UTAH STATE UNIVERSITYInventors: Chenguang Liu, Ran Chang, Bruce Christensen, Juan De La Cruz, Pranab Banerjee, Doug Ahlstrom, Aravind Dasu
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Patent number: 8795899Abstract: An electrochemical energy storage device, lithium super-battery, comprising a positive electrode, a negative electrode, a porous separator disposed between the two electrodes, and a lithium-containing electrolyte in physical contact with the two electrodes, wherein the positive electrode comprises a plurality of chemically functionalized nano graphene platelets (f-NGP) or exfoliated graphite having a functional group that reversibly reacts with a lithium atom or ion. In a preferred embodiment, a lithium super-battery having a f-NGP positive electrode and Li4Ti5O12 negative electrode exhibits a gravimetric energy ˜5 times higher than conventional supercapacitors and a power density ˜10 times higher than conventional lithium-ion batteries. This device has the best properties of both the lithium ion battery and the supercapacitor.Type: GrantFiled: August 19, 2010Date of Patent: August 5, 2014Assignee: Nanotek Instruments, Inc.Inventors: Chenguang Liu, Aruna Zhamu, David Neff, Bor Z. Jang
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Publication number: 20140163703Abstract: A computer implemented method and system for multi-occupant motion tracking and monitoring may include partitioning out of a controlled space one or more interior regions, tracking one or more occupants within the controlled space by collecting a sequence of images of the controlled space, determining from the sequence of images one or more contiguous pixel groupings corresponding to non-persistent motion (referred to as blobs), and generating one or more bounding boxes that encompass each of the contiguous pixel groupings.Type: ApplicationFiled: July 19, 2012Publication date: June 12, 2014Applicant: UTAH STATE UNIVERSITYInventors: Ran Chang, Chenguang Liu, Aravind Dasu
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Publication number: 20140093130Abstract: A computer implemented method for sensing occupancy of a workspace includes creating a difference image that represents luminance differences of pixels in past and current images of the workspace resulting from motion in the workspace, determining motion occurring in regions of the workspace based on the difference image, and altering a workspace environment based at least in part on the determined motion. The method also includes determining which pixels in the difference image represent persistent motion that can be ignored and determining which pixels representing motion in the difference image are invalid because the pixels are isolated from other pixels representing motion.Type: ApplicationFiled: June 8, 2012Publication date: April 3, 2014Applicant: UTAH STATE UNIVERSITY RESEARCH FOUNDATIONInventors: Aravind Dasu, Dean Mathias, Chenguang Liu, Randy Christensen, Bruce Christensen
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Publication number: 20130138005Abstract: A system and method for performing off-line analysis of cardiac electrogram data, comprising: retrieving an electrogram from a memory location; identifying a first-channel group of candidate beats from at least a first channel of the electrogram; and identifying a second-channel group of candidate beats from at least a second channel of an electrogram. For each first-channel beat candidate near a second-channel beat candidate, the amplitude of the first-channel beat candidate is compared with the amplitude of a previous beat and the amplitude of a next beat on the first electrogram channel, and first-channel beat candidates that are outside of a first pre-determined range from either the previous or next beat are removed. Then first-channel beat candidates that are outside of a second pre-determined range from either the previous or next beat candidate are removed.Type: ApplicationFiled: May 30, 2012Publication date: May 30, 2013Applicant: CARDIAC PACEMAKERS, INC.Inventors: Yanting Dong, Shijie Zhang, Deepa Mahajan, Chenguang Liu, Dan Li, Yayun Lin, Derek D. Bohn
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Publication number: 20130138004Abstract: A system and method for performing independent, off-line evaluation of event sensing for collected electrograms, comprising: sensing an electrogram using an implantable medical device (IMD); determining locations of heart beats on at least one channel of the electrogram using a multi-pass process, resulting in a group of multi-pass beat locations; storing the electrogram and device-identified beat locations in a memory location; and retrieving the electrogram and device-identified beat locations from the memory location. The multi-pass process determines locations of heart beats on at least a first channel of the electrogram. The device-identified group of beat locations are then compared to the multi-pass group of beat locations identified using the multi-pass method. Based on the comparing step, oversensing of beats, undersensing of beats, or noise from the device can be detected.Type: ApplicationFiled: May 30, 2012Publication date: May 30, 2013Applicant: CARDIAC PACEMAKERS, INC.Inventors: Yanting Dong, Shijie Zhang, Deepa Mahajan, Chenguang Liu, Dan Li, Yayun Lin, Derek D. Bohn
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Publication number: 20130052489Abstract: A surface-mediated, lithium ion-exchanging energy storage device comprising: (a) A positive electrode (cathode) comprising a cathode active material that is not a functional material (bearing no functional group reactive with lithium), but having a surface area to capture or store lithium thereon; (b) A negative electrode (anode) comprising an anode active material having a surface area to capture or store lithium thereon; (c) A porous separator disposed between the two electrodes; and (d) A lithium-containing electrolyte in physical contact with the two electrodes, wherein the anode active material and/or the cathode active material has a specific surface area of no less than 100 m2/g in direct physical contact with the electrolyte to receive lithium ions therefrom or to provide lithium ions thereto; wherein at least one of the two electrodes contains therein a lithium source prior to a first charge or a first discharge cycle of the energy storage device.Type: ApplicationFiled: August 30, 2011Publication date: February 28, 2013Inventors: Aruna Zhamu, ChenGuang Liu, Xiqing Wang, Bor Z. Jang
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Publication number: 20120195982Abstract: An injectible, biocompatible synthetic bone growth composition comprising a mineralized collagen and a calcium sulfate component. The composition is formed into injectible formulation that may be provided at the site of a skeletal defect via minimally invasive manner. An osteoinductive component may be further added, either before or after forming the unitary article. The composition may be formulated as a paste or putty and facilitates bone growth and/or repair.Type: ApplicationFiled: January 28, 2011Publication date: August 2, 2012Applicant: Beijing Allgens Medical Science & Technology Co., Ltd.Inventors: Eric G. Hu, Kun Hu, Chenguang Liu, Zonggang Chen, Fuzai Cui
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Publication number: 20120171574Abstract: A surface-enabled, metal ion-exchanging battery device comprising a cathode, an anode, a porous separator, and a metal ion-containing electrolyte, wherein the metal ion is selected from (A) non-Li alkali metals; (B) alkaline-earth metals; (C) transition metals; (D) other metals such as aluminum (Al); or (E) a combination thereof; and wherein at least one of the electrodes contains therein a metal ion source prior to the first charge or discharge cycle of the device and at least the cathode comprises a functional material or nano-structured material having a metal ion-capturing functional group or metal ion-storing surface in direct contact with said electrolyte, and wherein the operation of the battery device does not involve the introduction of oxygen from outside the device and does not involve the formation of a metal oxide, metal sulfide, metal selenide, metal telluride, metal hydroxide, or metal-halogen compound.Type: ApplicationFiled: January 3, 2011Publication date: July 5, 2012Inventors: Aruna Zhamu, ChenGuang Liu, David Neff, Bor Z. Jang, Zhenning Yu
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Publication number: 20120164539Abstract: A surface-controlled, lithium ion-exchanging battery device comprising: (a) A positive electrode (cathode) comprising a first functional material having a first lithium-capturing or lithium-storing surface; (b) A negative electrode (anode) comprising a second functional material having a second lithium-capturing or lithium-storing surface; (c) A porous separator disposed between the two electrodes, and (d) A lithium-containing electrolyte (preferably liquid or gel electrolyte) in physical contact with the two electrodes; wherein at least one of the two electrodes contains therein a lithium source (e.g., lithium foil, lithium powder, stabilized lithium particles, etc) prior to the first charge or the first discharge cycle of the battery device. This new generation of energy storage device exhibits the best properties of both the lithium ion battery and the supercapacitor.Type: ApplicationFiled: December 23, 2010Publication date: June 28, 2012Inventors: Aruna Zhamu, ChenGuang Liu, David Neff, Bor Z. Jang
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Publication number: 20120077080Abstract: An electrochemical energy storage device, lithium super-battery, comprising a positive electrode, a negative electrode, a porous separator disposed between the two electrodes, and a lithium-containing electrolyte in physical contact with the two electrodes, wherein the positive electrode comprises a disordered carbon material having a functional group that reversibly reacts with a lithium atom or ion. The disordered carbon material is selected from a soft carbon, hard carbon, polymeric carbon or carbonized resin, meso-phase carbon, coke, carbonized pitch, carbon black, activated carbon, or partially graphitized carbon. In a preferred embodiment, a lithium super-battery having a functionalized disordered carbon cathode and a Li4Ti5O12 anode exhibits a gravimetric energy ˜5-10 times higher than those of conventional supercapacitors and a power density ˜10-30 times higher than those of conventional lithium-ion batteries. This device has the best properties of both the lithium ion battery and the supercapacitor.Type: ApplicationFiled: September 23, 2010Publication date: March 29, 2012Inventors: Chenguang Liu, Aruna Zhamu, David Neff, Bor Z. Jang
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Publication number: 20120045688Abstract: An electrochemical energy storage device, lithium super-battery, comprising a positive electrode, a negative electrode, a porous separator disposed between the two electrodes, and a lithium-containing electrolyte in physical contact with the two electrodes, wherein the positive electrode comprises a plurality of chemically functionalized nano graphene platelets (f-NGP) or exfoliated graphite having a functional group that reversibly reacts with a lithium atom or ion. In a preferred embodiment, a lithium super-battery having a f-NGP positive electrode and Li4Ti5O12 negative electrode exhibits a gravimetric energy ˜5 times higher than conventional supercapacitors and a power density ˜10 times higher than conventional lithium-ion batteries. This device has the best properties of both the lithium ion battery and the supercapacitor.Type: ApplicationFiled: August 19, 2010Publication date: February 23, 2012Inventors: Chenguang Liu, Aruna Zhamu, David Neff, Bor Z. Jang
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Publication number: 20120028253Abstract: A method for amplifying oligonucleotide in vitro by polymerase-endonuclease chain reaction (PECR) which utilizes a single-stranded DNA probe containing repeat sequences, extends a target oligonucleotide by a thermostable DNA polymerase, cleaves extended products with a thermostable endonuclease, and amplifies target oligonucleotide by thermocycling. In PECR, a specific oligonucleotide is exponentially amplified using one single probe instead of a pair of primers, and the reaction is precisely controlled by thermal cycles whose parameters are flexibly adjustable according to length, sequence, melting temperature and initial amount of the target oligonucleotide. Amplification speed depends totally on initial amount of target oligonucleotide present in the reaction system. The method can be used to amplify specific small nucleic acids, such as oligonucleotides and microRNAs, and further conduct quantitative analysis.Type: ApplicationFiled: April 3, 2009Publication date: February 2, 2012Inventors: Xiaolong Wang, Cuixian I.V., Deming Gou, Chenguang Liu