Patents by Inventor Feifei Gao

Feifei Gao 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: 10716108
    Abstract: The present application discloses a cellular network access method and apparatus. An embodiment of the cellular network access method for a base station comprises: receiving, from a pair of D2D devices, a result of a spectrum detection which indicates a load level of a detected spectrum; selecting a cellular communication mode or a D2D communication mode based on the received result of the spectrum detection; and notifying the pair of D2D devices of the selected mode. Through dynamic switching between the cellular communication mode and the D2D communication mode, it is possible to make full use of the available spectrum, thereby increasing the throughput of the system.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: July 14, 2020
    Assignees: Samsung Electronics Co., Ltd., Tsinghua University
    Inventors: Feifei Gao, Jingxing Fu, Yingyang Li, Chengjun Sun
  • Publication number: 20200048206
    Abstract: A method for preparing 5-(4-bromophenyl)-4,6-dichloropyrimidine is provided. The method comprises the steps of: preparing methyl p-bromophenylacetate (Intermediate I) by catalytic esterification of p-bromophenylacetic acid, and then reacting with dimethyl carbonate to synthesize 2-(4-bromophenyl)-malonic acid-1,3-dimethyl ester (Intermediate 2), cyclizing with formamidine hydrochloride to obtain 5-(4-bromophenyl)-4,6-dihydroxypyrimidine (Intermediate 3), and then chlorinating to give the product 5-(4-bromophenyl)-4,6-dichloropyrimidine. In the process of preparing Intermediate 1 in the present invention, a solid acid is used as a catalyst. Moreover, in the process of preparing Intermediate 2, sodium methoxide is used as a base in place of sodium hydride or sodium amide used in the prior art. Furthermore, Intermediate 3 is prepared by a one-pot process.
    Type: Application
    Filed: January 9, 2019
    Publication date: February 13, 2020
    Applicant: ZHEJIANG XIANFENG TECHNOLOGIES CO.,LTD
    Inventors: Feifei GAO, Junlong GAO, Minliang ZHU, Wei LU, Yi LIU
  • Patent number: 10556871
    Abstract: A method for preparing 5-(4-bromophenyl)-4,6-dichloropyrimidine is provided. The method comprises the steps of: preparing methyl p-bromophenylacetate (Intermediate I) by catalytic esterification of p-bromophenylacetic acid, and then reacting with dimethyl carbonate to synthesize 2-(4-bromophenyl)-malonic acid-1,3-dimethyl ester (Intermediate 2), cyclizing with formamidine hydrochloride to obtain 5-(4-bromophenyl)-4,6-dihydroxypyrimidine (Intermediate 3), and then chlorinating to give the product 5-(4-bromophenyl)-4,6-dichloropyrimidine. In the process of preparing Intermediate 1 in the present invention, a solid acid is used as a catalyst. Moreover, in the process of preparing Intermediate 2, sodium methoxide is used as a base in place of sodium hydride or sodium amide used in the prior art. Furthermore, Intermediate 3 is prepared by a one-pot process.
    Type: Grant
    Filed: January 9, 2019
    Date of Patent: February 11, 2020
    Assignee: ZHEJIANG XIANFENG TECHNOLOGIES CO., LTD.
    Inventors: Feifei Gao, Junlong Gao, Minliang Zhu, Wei Lu, Yi Liu
  • Publication number: 20170325229
    Abstract: The present application discloses a cellular network access method and apparatus. An embodiment of the cellular network access method for a base station comprises: receiving, from a pair of D2D devices, a result of a spectrum detection which indicates a load level of a detected spectrum; selecting a cellular communication mode or a D2D communication mode based on the received result of the spectrum detection; and notifying the pair of D2D devices of the selected mode. Through dynamic switching between the cellular communication mode and the D2D communication mode, it is possible to make full use of the available spectrum, thereby increasing the throughput of the system.
    Type: Application
    Filed: November 6, 2015
    Publication date: November 9, 2017
    Inventors: Feifei Gao, Jingxing Fu, Yingyang Li, Chengjun Sun
  • Patent number: 9716240
    Abstract: The present invention relates to novel compounds that are useful as ligands in organometallic dyes. More particularly, the invention relates to dyes comprising the compounds, said dyes being sensitizing dyes useful in solar cell technology. According to an embodiment, the present invention discloses new ruthenium dyes and their application in dye-sensitized solar cells (DSC). The referred ruthenium dyes with new structural features can be easily synthesized, show more than 85% light-to-electricity conversion efficiency and a higher than 9% cell efficiency.
    Type: Grant
    Filed: February 27, 2009
    Date of Patent: July 25, 2017
    Assignee: Ecole Polytechnique Federale de Lausanne (EPFL)
    Inventors: Feifei Gao, Yuan Wang, Jing Zhang, Peng Wang, Shaik Mohammad Zakeeruddin, Michael Graetzel
  • Patent number: 9396882
    Abstract: The present invention refers to using the principal of a room temperature molten ionic liquid, to an electrolyte, to devices comprising the ionic liquid co-melting, and to the preparation of a room temperature ionic liquid via various physical and chemical methods. The room temperature molten ionic liquid comprises at least two component salts, at least one of which is not molten at room temperature, but, if combined with another salt, is in the molten state at room temperature.
    Type: Grant
    Filed: December 12, 2013
    Date of Patent: July 19, 2016
    Assignee: Ecole Polytechnique Federale de Lausanne (EPFL)
    Inventors: Zing Zhang, Chengcheng Xi, Yiming Cao, Feifei Gao, Peng Wang, Shaik Mohammad Zakeeruddin, Michael Graetzel
  • Publication number: 20140097376
    Abstract: The present invention refers to using the principal of a room temperature molten ionic liquid, to an electrolyte, to devices comprising the ionic liquid co-melting, and to the preparation of a room temperature ionic liquid via various physical and chemical methods. The room temperature molten ionic liquid comprises at least two component salts, at least one of which is not molten at room temperature, but, if combined with another salt, is in the molten state at room temperature.
    Type: Application
    Filed: December 12, 2013
    Publication date: April 10, 2014
    Applicant: Ecole Polytechnique Federale de Lausanne (EPFL)
    Inventors: Jing Zhang, Chengcheng Xi, Yiming Cao, Feifei Gao, Peng Wang, Shaik Mohammad Zakeeruddin, Michael Graetzel
  • Patent number: 8686285
    Abstract: The present invention refers to using the principal of a room temperature molten ionic liquid, to an electrolyte, to devices comprising the ionic liquid co-melting, and to the preparation of a room temperature ionic liquid via various physical and chemical methods. The room temperature molten ionic liquid comprises at least two component salts, at least one of which is not molten at room temperature, but, if combined with another salt, is in the molten state at room temperature.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: April 1, 2014
    Assignee: Ecole Polytechnique Federale de Lausanne (EPFL)
    Inventors: Jing Zhang, Chengcheng Xi, Yiming Cao, Feifei Gao, Peng Wang, Shaik Mohammad Zakeeruddin, Michael Graetzel
  • Patent number: 8487119
    Abstract: The present invention relates to new organic sensitizer compounds and to photoelectric conversion devices, in particular dye-sensitised solar cells comprising the new sensitizers. The present invention also relates to flexible photoelectric conversion devices, which are based on ionic liquid electrolytes or organic charge transporting materials.
    Type: Grant
    Filed: February 3, 2009
    Date of Patent: July 16, 2013
    Assignee: Ecole Polytechnique Federale de Lausanne (EPFL)
    Inventors: Mingfei Xu, Hao Qin, Feifei Gao, Peng Wang, Shaik Mohammad Zakeeruddin, Michael Graetzel
  • Publication number: 20110062541
    Abstract: The present invention relates to novel compounds that are useful as ligands in organometallic dyes. More particularly, the invention relates to dyes comprising the compounds, said dyes being sensitizing dyes useful in solar cell technology. According to an embodiment, the present invention discloses new ruthenium dyes and their application in dye-sensitized solar cells (DSC). The referred ruthenium dyes with new structural features can be easily synthesized, show more than 85% light-to-electricity conversion efficiency and a higher than 9% cell efficiency.
    Type: Application
    Filed: February 27, 2009
    Publication date: March 17, 2011
    Inventors: Feifei Gao, Yuan Wang, Jing Zhang, Peng Wang, shaik Mohammad Zakeeruddin, Michael Graetzel
  • Publication number: 20110041907
    Abstract: The present invention relates to new organic sensitizer compounds and to photoelectric conversion devices, in particular dye-sensitised solar cells comprising the new sensitizers. The present invention also relates to flexible photoelectric conversion devices, which are based on ionic liquid electrolytes or organic charge transporting materials.
    Type: Application
    Filed: February 3, 2009
    Publication date: February 24, 2011
    Inventors: Mingfei Xu, Hao Qin, Feifei Gao, Peng Wang, Shaik Mohammad Zakeeruddin, Michael Graetzel
  • Publication number: 20110012048
    Abstract: The present invention refers to using the principal of a room temperature molten ionic liquid, to an electrolyte, to devices comprising the ionic liquid co-melting, and to the preparation of a room temperature ionic liquid via various physical and chemical methods. The room temperature molten ionic liquid comprises at least two component salts, at least one of which is not molten at room temperature, but, if combined with another salt, is in the molten state at room temperature.
    Type: Application
    Filed: December 23, 2008
    Publication date: January 20, 2011
    Inventors: Jing Zhang, Chengcheng Xi, Yiming Cao, Feifei Gao, Peng Wang, Shaik Mohammad Zakeeruddin, Michael Graetzel