Patents by Inventor Xiaoming Ren

Xiaoming Ren 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).

  • Patent number: 10790631
    Abstract: The present invention demonstrates a technique for achieving milli-joule level and higher energy, broad bandwidth laser pulses centered around 2.4 micrometer with a kilohertz and other repetition rate. The key to such technique is to start with a broadband micro-joule level seed laser at around 2.4 micrometer, which could be generated through difference frequency generation, four-wave mixing process and other methods. This micro-joule level seed laser could then be amplified to above one milli-joule through chirped pulse amplification in a Cr2+:ZnSe or Cr2+:ZnS crystal pumped by a commercially available Ho:YAG or other appropriate suitable lasers. Due to the high seed energy, fewer gain passes are needed to achieve a milli-joule level output thus significantly simplifies laser architectures. Furthermore, gain narrowing effect in a typical chirped pulse amplifier is also mitigated and thus enable a broadband output.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: September 29, 2020
    Assignee: University of Central Florida Research Foundation, Inc.
    Inventors: Zenghu Chang, Xiaoming Ren, Yanchun Yin, Lam Mach
  • Patent number: 10624575
    Abstract: A method, a wearable device, and an apparatus for monitoring sleep of a user are provided. The method includes: determining an activity amount of a user based on multi-axial acceleration data received by the wearable device in a time period, in which the multi-axial acceleration data includes acceleration data in multiple axes; if the activity amount is smaller than a first threshold, determining a microactivity feature value using the multi-axial acceleration data and predetermined weights; and determining a microactivity state for the user in the time period based on the microactivity feature value, in which the activity amount of the user is substantially zero in the microactivity state.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: April 21, 2020
    Assignee: Anhui Huami Information Technology Co., Ltd.
    Inventors: Feifei Zhang, Xiaoming Ren
  • Publication number: 20190020166
    Abstract: The present invention demonstrates a technique for achieving milli-joule level and higher energy, broad bandwidth laser pulses centered around 2.4 micrometer with a kilohertz and other repetition rate. The key to such technique is to start with a broadband micro-joule level seed laser at around 2.4 micrometer, which could be generated through difference frequency generation, four-wave mixing process and other methods. This micro-joule level seed laser could then be amplified to above one milli-joule through chirped pulse amplification in a Cr2+:ZnSe or Cr2+:ZnS crystal pumped by a commercially available Ho:YAG or other appropriate suitable lasers. Due to the high seed energy, fewer gain passes are needed to achieve a milli-joule level output thus significantly simplifies laser architectures. Furthermore, gain narrowing effect in a typical chirped pulse amplifier is also mitigated and thus enable a broadband output.
    Type: Application
    Filed: July 11, 2018
    Publication date: January 17, 2019
    Applicant: UNIVERSITY OF CENTRAL FLORIDA RESEARCH FOUNDATION, INC.
    Inventors: Zenghu Chang, Xiaoming Ren, Yanchun Yin, Lam Mach
  • Patent number: 9843930
    Abstract: The present disclosure provides a TEE initialization method. An operator identifier acquired from an SIM card is compared with operator identifiers in a list or a table of correspondence between the operator identifiers and public keys preset in a TEE of a mobile terminal, so as to acquire a public key and authenticate a TSM platform with the public key. After the TSM platform has been authenticated successfully, loading processing on the TEE is completed, and a management key of the TEE is downloaded from the TSM platform. According to the present disclosure, it is able to initialize the TEE of the mobile terminal without designating an operator, thereby to improve the openness of the mobile terminal as well as the user experience.
    Type: Grant
    Filed: December 25, 2014
    Date of Patent: December 12, 2017
    Assignee: China Mobile Communications Corporation
    Inventors: Xiaoming Ren, Gengsheng Huang
  • Publication number: 20170224275
    Abstract: A method, a wearable device, and an apparatus for monitoring sleep of a user are provided. The method includes: determining an activity amount of a user based on multi-axial acceleration data received by the wearable device in a time period, in which the multi-axial acceleration data includes acceleration data in multiple axes; if the activity amount is smaller than a first threshold, determining a microactivity feature value using the multi-axial acceleration data and predetermined weights; and determining a microactivity state for the user in the time period based on the microactivity feature value, in which the activity amount of the user is substantially zero in the microactivity state.
    Type: Application
    Filed: April 26, 2017
    Publication date: August 10, 2017
    Inventors: Feifei Zhang, Xiaoming Ren
  • Publication number: 20160330618
    Abstract: The present disclosure provides a TEE initialization method. An operator identifier acquired from an SIM card is compared with operator identifiers in a list or a table of correspondence between the operator identifiers and public keys preset in a TEE of a mobile terminal, so as to acquire a public key and authenticate a TSM platform with the public key. After the TSM platform has been authenticated successfully, loading processing on the TEE is completed, and a management key of the TEE is downloaded from the TSM platform. According to the present disclosure, it is able to initialize the TEE of the mobile terminal without designating an operator, thereby to improve the openness of the mobile terminal as well as the user experience.
    Type: Application
    Filed: December 25, 2014
    Publication date: November 10, 2016
    Inventors: Xiaoming REN, Gengsheng HUANG
  • Publication number: 20120284519
    Abstract: An implementing method, a system of a universal card system and a smart card are disclosed. The smart card receives the creating master control sub-application message from a card-issuing party operation platform, decrypts the message according to a pre-stored encryption key of the card-issuing party sensitive data, obtains the master control sub-application data, and creates a master control sub-application according to the master control sub-application data. An enterprise managing key is included in the master control sub-application data. The smart card receives the creating non-master control sub-application message from an enterprise operation platform, decrypts the creating non-master control sub-application message according to encryption key of the enterprise sensitive data in the enterprise managing key, obtains the non-master control sub-application data, and creates a non-master control sub-application according to the non-master control sub-application data.
    Type: Application
    Filed: December 21, 2010
    Publication date: November 8, 2012
    Inventors: Zuhui Yue, Manxue Guo, Xiaoming Ren, Feng Luo, Yaqiang Li
  • Publication number: 20100099005
    Abstract: A direct hydrocarbon fuel cell device pertaining direct electro-oxidation of hydrocarbon fuels at the anode, which is separated electronically from the cell cathode by an alkaline medium, together with a fuel container, fuel delivery, and reaction product releasing system is disclosed. The fuel cell is constructed in such a manner that highly concentrated fuel is added to the cell anode chamber and transformed into fuel vapor through a fuel vapor permeable membrane before the fuel reaches the cell anode. At the cell anode, the hydrocarbon fuel is consumed and at the cell cathode oxygen reduction takes place, and water as one of the fuel cell reaction products is evaporated off at cell cathode so that there is no need for recirculation of unreacted fuel at the cell anode or water at the cell cathode.
    Type: Application
    Filed: May 15, 2007
    Publication date: April 22, 2010
    Inventors: Xiaoming Ren, Paolo Bert
  • Patent number: 7638215
    Abstract: A simplified direct oxidation fuel cell system is provided. The fuel cell is constructed in such a manner that fuel is added to the cell anode as it is consumed and water is evaporated off at cell cathode so that there is no need for recirculation of unreacted fuel at the cell anode or water at the cell cathode. In addition, carbon dioxide generated from the anodic reaction is passively vented out of the system by using a CO2 gas permeable membrane material integrated as part of the anode chamber construction. It is thus possible that, the CO2 separation from the anode fluid occurs without the recirculation of the anode fluid outside the anode chamber. The passive system in which fuel is added as it is consumed and CO2 separated, both without pumping, ultimately will increase net power provided to the load due to low parasitic losses.
    Type: Grant
    Filed: November 8, 2005
    Date of Patent: December 29, 2009
    Assignee: MTI Microfuel Cells Inc.
    Inventors: Xiaoming Ren, Juan J. Becerra, Gerhard Beckmann, Eric J. Brown, Michael S. DeFilippis, Jay K. Neutzler, Shimshon Gottesfeld
  • Publication number: 20090317308
    Abstract: Catalysts are formulated to resemble a direct ammonia/air fuel cell at short circuit at the nanoscale level to convert ammonia in aqueous solution directly and spontaneously to nitrogen at near or above ambient temperature. The catalyst particle contains a type-A catalyst subparticles for ammonia oxidation to nitrogen, and a type-C catalyst subparticles for oxygen reduction, with the type-A and type-C catalyst subparticles electrically shorted. Advantages realized at the nanoscale level are enhanced conductances for electrons and hydroxyl anions between the neighboring type-A and type-C catalyst subparticles. With the catalysts packed and confined in a catalyst bed in a chemical reactor, the direct conversion of ammonia in an aqueous phase to nitrogen can be carried out continuously for ammonia removal from a water stream in a compact package, and without the high cost arising from constructing and maintaining a bulk electrochemical device, and without the step of exacting the ammonia into gas phase.
    Type: Application
    Filed: June 18, 2009
    Publication date: December 24, 2009
    Inventor: Xiaoming Ren
  • Patent number: 7541109
    Abstract: Passive water management techniques are provided in an air-breathing direct oxidation fuel cell system. A highly hydrophobic component with sub-micrometer wide pores is laminated to the catalyzed membrane electrolyte on the cathode side. This component blocks liquid water from traveling out of the cathode and instead causes the water to be driven through the polymer membrane electrolyte to the cell anode. The air-breathing direct oxidation fuel cell also includes a layer of cathode backing and additional cathode filter components on an exterior aspect of the cell cathode which lessen the water vapor escape rate from the cell cathode. The combination of the well laminated hydrophobic microporous layer, the thicker backing and the added filter layer, together defines a cathode structure of unique water management capacity, that enables to operate a DMFC with direct, controlled rate supply of neat (100%) methanol, without the need for any external supply or pumping of water.
    Type: Grant
    Filed: October 16, 2007
    Date of Patent: June 2, 2009
    Assignee: MTI MicroFuel Cells, Inc.
    Inventors: Xiaoming Ren, Frank W. Kovacs, Kevin J. Shufon, Shimshon Gottesfeld
  • Patent number: 7531013
    Abstract: The present invention provides a viscous fuel, which includes a fuel substance held in a polymeric structure, where the viscous fuel has benefits over previous fuels, including performance enhancements and desirable physical characteristics. One embodiment of the formulation includes neat methanol, to which a thickening substance, such as that sold commercially under the trade name Carbopol®, is added to impart viscosity, as well as stabilizing and suspending properties. In addition to the thickening substance, a further substance can be added to balance the pH of the viscous fuel when needed.
    Type: Grant
    Filed: May 10, 2004
    Date of Patent: May 12, 2009
    Assignee: MTI Microfuel Cells Inc.
    Inventors: Xiaoming Ren, Lena A. Guleserian
  • Patent number: 7419731
    Abstract: A fuel reservoir having a reticulated material, generally a felt or a foam, disposed therein is provided. The addition of this reticulated material, either alone or in combination with a viscous fuel, assists the prevention of undesired flow of the fuel, the minimization of undesired leakages, and assists in orientation independence and uniform distribution of the fuel in the reservoir. The reticulated material enables the use of a viscous liquid fuel that has fuel diffusion rates and fuel utilization characteristics that approach those of neat liquid methanol. The material also helps create a greater surface area for evaporation, thus allowing a highly concentrated, vaporous fuel substance to be delivered to an associated fuel cell.
    Type: Grant
    Filed: May 10, 2004
    Date of Patent: September 2, 2008
    Assignee: MTI MicroFuel Cells, Inc.
    Inventors: Michael P. Manning, Ashish K. Modi, Xiaoming Ren, Lena A. Guleserian
  • Patent number: 7407721
    Abstract: A passive direct oxidation fuel cell system, which uses a high concentration fuel such as neat methanol as a direct feed to an anode aspect of the fuel cell, is provided. The fuel cell includes a passive water management capability, achieved by the combined functions of controlled fuel dosing, effective push back of liquid water from the cathode through the membrane electrolyte by a hydrophobic microporous layer well bonded to the cathode catalyst and the use of a thin ionomeric membrane. The rate of fuel delivery is controlled by a passive fuel transport barrier. Carbon dioxide management techniques are also provided.
    Type: Grant
    Filed: April 15, 2003
    Date of Patent: August 5, 2008
    Assignee: MTI MicroFuel Cells, Inc.
    Inventors: Xiaoming Ren, Juan J. Becerra, Robert S. Hirsch, Shimshon Gottesfeld, Frank W. Kovacs, Kevin J. Shufon
  • Publication number: 20080032182
    Abstract: Passive water management techniques are provided in an air-breathing direct oxidation fuel cell system. A highly hydrophobic component with sub-micrometer wide pores is laminated to the catalyzed membrane electrolyte on the cathode side. This component blocks liquid water from traveling out of the cathode and instead causes the water to be driven through the polymer membrane electrolyte to the cell anode. The air-breathing direct oxidation fuel cell also includes a layer of cathode backing and additional cathode filter components on an exterior aspect of the cell cathode which lessen the water vapor escape rate from the cell cathode. The combination of the well laminated hydrophobic microporous layer, the thicker backing and the added filter layer, together defines a cathode structure of unique water management capacity, that enables to operate a DMFC with direct, controlled rate supply of neat (100%) methanol, without the need for any external supply or pumping of water.
    Type: Application
    Filed: October 16, 2007
    Publication date: February 7, 2008
    Applicant: MTI MicroFuel Cells Inc.
    Inventors: Xiaoming Ren, Frank Kovacs, Kevin Shufon, Shimshon Gottesfeld
  • Patent number: 7314493
    Abstract: Fuel mixtures for direct methanol fuel cells are disclosed. The fuels include methanol and additives that react with water to produce methanol and other easily electro-oxidizable compounds including dimethyloxymethane, methylorthoformate, tetramethylorthocarbonate, trimethylborate, and tetramethylorthosilicate. Other additives to improve safety and efficiency of the fuel cell include sulfonated activated carbon particles and metal hydrides, such as LiAlH4, NaBH4, LiBH4, (CH3)2 NHBH3, NaAlH4, B2H6, NaCNBH3, CaH2, LiH, NaH, KH or sodium bis (2-methoxyethoxy) dihydridaluminate.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: January 1, 2008
    Assignee: The Gillette Company
    Inventors: Xiaoming Ren, Kevin J. Shufon, Frank W. Kovacs
  • Patent number: 7297430
    Abstract: A fuel cell diffusion layer for delivering a fuel mixture to the anode face of a catalyzed membrane and for resisting flow of carbon dioxide produced in the anodic reaction back into the associated fuel chamber. The diffusion layer contains either conduits or channels on one aspect thereof to redirect the carbon dioxide generated at the anode in the fuel cell reaction away from the catalyzed membrane and away from the fuel chamber. This avoids the volume replacement by carbon dioxide of fuel mixture in the anode chamber and enhances the concentration of methanol that can be used in the fuel mixture. It also serves to allow only that fuel that is consumed in the reaction to enter the space between the anode face of the catalyzed membrane and the diffusion layer adjacent thereto. The diffusion layer further includes perforations to increase the ability to deliver fuel to the anode aspect of the membrane electrode assembly of the fuel cell.
    Type: Grant
    Filed: October 1, 2002
    Date of Patent: November 20, 2007
    Assignee: MTI MicroFuel Cells, Inc.
    Inventors: Gerhard Beckmann, Xiaoming Ren
  • Patent number: 7282293
    Abstract: Passive water management techniques are provided in an air-breathing direct oxidation fuel cell system. A highly hydrophobic component with sub-micrometer wide pores is laminated to the catalyzed membrane electrolyte on the cathode side. This component blocks liquid water from traveling out of the cathode and instead causes the water to be driven through the polymer membrane electrolyte to the cell anode. The air-breathing direct oxidation fuel cell also includes a layer of cathode backing and additional cathode filter components on an exterior aspect of the cell cathode which lessen the water vapor escape rate from the cell cathode. The combination of the well laminated hydrophobic microporous layer, the thicker backing and the added filter layer, together defines a cathode structure of unique water management capacity, that enables to operate a DMFC with direct, controlled rate supply of neat (100%) methanol, without the need for any external supply or pumping of water.
    Type: Grant
    Filed: June 4, 2003
    Date of Patent: October 16, 2007
    Assignee: MTI MicroFuel Cells Inc.
    Inventors: Xiaoming Ren, Frank W. Kovacs, Kevin J. Shufon, Shimshon Gottesfeld
  • Patent number: 7255947
    Abstract: The present invention provides a gel fuel, which includes a fuel substance held in a polymeric structure. One embodiment of the composition includes neat methanol, to which a thickening substance, such as that sold commercially under the trade name Carbopol®, is added to impart viscosity, as well as stabilizing and suspending properties. In addition to the thickening substance, a further substance can be added to balance the pH of the gel fuel when needed. In accordance with the invention, a fuel cell cartridge is provided that has at least one aspect that is methanol-permeable, and which may include a fuel vapor permeable layer and it may be comprised of one of a number of various alternative materials. Features within the fuel cartridge can be used to increase surface area of the gel fuel, and to maintain the gel fuel in a desired location within the cartridge.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: August 14, 2007
    Assignee: The Gillette Company
    Inventors: Juan J. Becerra, Frank W. Kovacs, Xiaoming Ren
  • Patent number: 7179501
    Abstract: A fuel cell diffusion layer providing a preferential path by which liquid reactants or byproducts may be supplied to or removed from a direct oxidation fuel cell is described. The modified diffusion layer will be typically on the cathode side of the fuel cell and its use is to eliminate or minimize flooding of the cathode diffusion layer area, which is a performance limiting condition in direct methanol fuel cells. In accordance with one embodiment of the invention, the diffusion layer includes a substrate that is coated with a microporous layer. A pattern may be embossed into the diffusion layer, to create preferential flow paths by which water will travel and thereby be removed from the cathode catalyst area. This avoids cathode flooding and avoids build up of potentially destructive pressure by possible cathodic water accumulation.
    Type: Grant
    Filed: April 13, 2005
    Date of Patent: February 20, 2007
    Assignee: MTI MicroFuel Cells Inc.
    Inventors: Gerhard Beckmann, Xiaoming Ren, Paul F. Mutolo, Frank W. Kovacs, Shimshon Gottesfeld