Patents by Inventor Zhefeng Li

Zhefeng Li 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: 20220103271
    Abstract: Architectures and techniques are presented that can provide point-to-point analysis to generate an improved signal strength prediction (SSP) based on, e.g., earth surface image data processing and analysis to draw conclusions of line of sight (LOS) along the propagation path between a BTS or another AP transmitter and CPE receiver. For example, USGS image data and/or elevation data of locations are identified to correspond to signal propagation between the transmitter and receiver can be analyzed for LOS signal quality at a fixed location, in addition to the statistical model prediction of the RF signal quality. As a result, foliage or terrain that obstructs the LOS can be identified and utilized to improve SSP by eliminating the additional pathloss due to LOS obstructions. Such can provide a significant improvement to SSP results that are conventionally predicted by statistical models rather than a point-to-point analysis.
    Type: Application
    Filed: December 13, 2021
    Publication date: March 31, 2022
    Inventors: Zhen Wan, Xiaoyu Wang, Ravi Raina, Eric Antonio Alino, Zhefeng Li
  • Patent number: 11233593
    Abstract: Architectures and techniques are presented that can provide point-to-point analysis to generate an improved signal strength prediction (SSP) based on, e.g., earth surface image data processing and analysis to draw conclusions of line of sight (LOS) along the propagation path between a BTS or another AP transmitter and CPE receiver. For example, USGS image data and/or elevation data of locations are identified to correspond to signal propagation between the transmitter and receiver can be analyzed for LOS signal quality at a fixed location, in addition to the statistical model prediction of the RF signal quality. As a result, foliage or terrain that obstructs the LOS can be identified and utilized to improve SSP by eliminating the additional pathloss due to LOS obstructions. Such can provide a significant improvement to SSP results that are conventionally predicted by statistical models rather than a point-to-point analysis.
    Type: Grant
    Filed: December 11, 2018
    Date of Patent: January 25, 2022
    Assignees: AT&T Intellectual Property I, L.P., AT&T Mobility II LLC
    Inventors: Zhen Wan, Xiaoyu Wang, Ravi Raina, Eric Antonio Alino, Zhefeng Li
  • Publication number: 20210212341
    Abstract: The disclosure provides a microcapsule including: a core material, an inner membrane, and an outer membrane. The core material includes choline chloride and a carrier. The inner membrane includes at least one vegetable fat having a melting point higher than or equal to 60° C. The outer membrane includes rice bran wax, zinc oxide powders, and a film forming material. The film forming material is glucose phthalate, polyethylene glycol, or sodium alginate. The rice bran wax accounts for 5-10 wt. % of the microcapsule. The mass ratio of the rice bran wax to the zinc oxide powders to the film forming material is 1-5:0.1-1:0.1-1.
    Type: Application
    Filed: March 29, 2021
    Publication date: July 15, 2021
    Inventors: Erhua XU, Zhefeng LI, Qianyun ZHANG
  • Publication number: 20200186266
    Abstract: Architectures and techniques are presented that can provide point-to-point analysis to generate an improved signal strength prediction (SSP) based on, e.g., earth surface image data processing and analysis to draw conclusions of line of sight (LOS) along the propagation path between a BTS or another AP transmitter and CPE receiver. For example, USGS image data and/or elevation data of locations are identified to correspond to signal propagation between the transmitter and receiver can be analyzed for LOS signal quality at a fixed location, in addition to the statistical model prediction of the RF signal quality. As a result, foliage or terrain that obstructs the LOS can be identified and utilized to improve SSP by eliminating the additional pathloss due to LOS obstructions. Such can provide a significant improvement to SSP results that are conventionally predicted by statistical models rather than a point-to-point analysis.
    Type: Application
    Filed: December 11, 2018
    Publication date: June 11, 2020
    Inventors: Zhen Wan, Xiaoyu Wang, Ravi Raina, Eric Antonio Alino, Zhefeng Li
  • Patent number: 10665426
    Abstract: Methods are disclosed for depositing a thin film of compound material on a substrate. In some embodiments, a method of depositing a layer of compound material on a substrate include: flowing a reactive gas into a plasma processing chamber having a substrate to be sputter deposited disposed therein in opposition to a sputter target comprising a metal; exciting the reactive gas into a reactive gas plasma to react with the sputter target and to form a first layer of compound material thereon; flowing an inert gas into the plasma processing chamber; and exciting the inert gas into a plasma to sputter a second layer of the compound material onto the substrate directly from the first layer of compound material. The cycles of target poisoning and sputtering may be repeated until a compound material layer of appropriate thickness has been formed on the substrate.
    Type: Grant
    Filed: December 31, 2015
    Date of Patent: May 26, 2020
    Assignee: APPLIED MATERIALS, INC.
    Inventors: Yana Cheng, Zhefeng Li, Chi Hong Ching, Yong Cao, Rongjun Wang
  • Publication number: 20170125215
    Abstract: Methods are disclosed for depositing a thin film of compound material on a substrate. In some embodiments, a method of depositing a layer of compound material on a substrate include: flowing a reactive gas into a plasma processing chamber having a substrate to be sputter deposited disposed therein in opposition to a sputter target comprising a metal; exciting the reactive gas into a reactive gas plasma to react with the sputter target and to form a first layer of compound material thereon; flowing an inert gas into the plasma processing chamber; and exciting the inert gas into a plasma to sputter a second layer of the compound material onto the substrate directly from the first layer of compound material. The cycles of target poisoning and sputtering may be repeated until a compound material layer of appropriate thickness has been formed on the substrate.
    Type: Application
    Filed: December 31, 2015
    Publication date: May 4, 2017
    Inventors: Yana CHENG, Zhefeng LI, Chi Hong CHING, Yong CAO, Rongjun WANG
  • Patent number: 9048294
    Abstract: Described are manganese-containing films, as well as methods for providing the manganese-containing films. Doping manganese-containing films with Co, Mn, Ru, Ta, Al, Mg, Cr, Nb, Ti or V allows for enhanced copper barrier properties of the manganese-containing films. Also described are methods of providing films with a first layer comprising manganese silicate and a second layer comprising a manganese-containing film.
    Type: Grant
    Filed: April 11, 2013
    Date of Patent: June 2, 2015
    Assignee: Applied Materials, Inc.
    Inventors: Jing Tang, Zhefeng Li, Paul F. Ma, David Thompson
  • Publication number: 20130273733
    Abstract: Described are manganese-containing films, as well as methods for providing the manganese-containing films. Doping manganese-containing films with Co, Mn, Ru, Ta, Al, Mg, Cr, Nb, Ti or V allows for enhanced copper barrier properties of the manganese-containing films. Also described are methods of providing films with a first layer comprising manganese silicate and a second layer comprising a manganese-containing film.
    Type: Application
    Filed: April 11, 2013
    Publication date: October 17, 2013
    Inventors: Jing Tang, Zhefeng Li, Paul F. Ma, David Thompson
  • Patent number: 8509762
    Abstract: In some embodiments, an apparatus includes a monitor module, a detector module and an adjustment module. The monitor module is configured to receive a set of indicators from a wireless network. The detector module is configured to detect an underperformance condition during a time period and within a first cell of the wireless network based on the set of indicators. The adjustment module is configured to iteratively adjust a parameter associated with a second cell of the wireless network to produce an adjusted parameter. The adjustment module is configured to send the adjusted parameter to the wireless network to improve performance of the wireless network. The adjustment module is configured to restore, after the time period, the parameter associated with the second cell to a value equal to a value for the parameter prior to the time period, and send that value of the parameter to the wireless network.
    Type: Grant
    Filed: January 19, 2012
    Date of Patent: August 13, 2013
    Assignee: Reverb Networks, Inc.
    Inventors: Zhefeng Li, Kyounghwan Lee, Mustafa E. Sahin, Osama Tarraf
  • Publication number: 20120295609
    Abstract: In some embodiments, an apparatus includes a monitor module, a detector module and an adjustment module. The monitor module is configured to receive a set of indicators from a wireless network. The detector module is configured to detect an underperformance condition during a time period and within a first cell of the wireless network based on the set of indicators. The adjustment module is configured to iteratively adjust a parameter associated with a second cell of the wireless network to produce an adjusted parameter. The adjustment module is configured to send the adjusted parameter to the wireless network to improve performance of the wireless network. The adjustment module is configured to restore, after the time period, the parameter associated with the second cell to a value equal to a value for the parameter prior to the time period, and send that value of the parameter to the wireless network.
    Type: Application
    Filed: January 19, 2012
    Publication date: November 22, 2012
    Applicant: ReVerb Networks, Inc.
    Inventors: Zhefeng Li, Kyounghwan Lee, Mustafa E. Sahin, Osama Tarraf