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).
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Patent number: 10716108Abstract: 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: GrantFiled: November 6, 2015Date of Patent: July 14, 2020Assignees: Samsung Electronics Co., Ltd., Tsinghua UniversityInventors: Feifei Gao, Jingxing Fu, Yingyang Li, Chengjun Sun
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Publication number: 20200048206Abstract: 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: ApplicationFiled: January 9, 2019Publication date: February 13, 2020Applicant: ZHEJIANG XIANFENG TECHNOLOGIES CO.,LTDInventors: Feifei GAO, Junlong GAO, Minliang ZHU, Wei LU, Yi LIU
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Patent number: 10556871Abstract: 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: GrantFiled: January 9, 2019Date of Patent: February 11, 2020Assignee: ZHEJIANG XIANFENG TECHNOLOGIES CO., LTD.Inventors: Feifei Gao, Junlong Gao, Minliang Zhu, Wei Lu, Yi Liu
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Publication number: 20170325229Abstract: 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: ApplicationFiled: November 6, 2015Publication date: November 9, 2017Inventors: Feifei Gao, Jingxing Fu, Yingyang Li, Chengjun Sun
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Patent number: 9716240Abstract: 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: GrantFiled: February 27, 2009Date of Patent: July 25, 2017Assignee: Ecole Polytechnique Federale de Lausanne (EPFL)Inventors: Feifei Gao, Yuan Wang, Jing Zhang, Peng Wang, Shaik Mohammad Zakeeruddin, Michael Graetzel
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Patent number: 9396882Abstract: 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: GrantFiled: December 12, 2013Date of Patent: July 19, 2016Assignee: Ecole Polytechnique Federale de Lausanne (EPFL)Inventors: Zing Zhang, Chengcheng Xi, Yiming Cao, Feifei Gao, Peng Wang, Shaik Mohammad Zakeeruddin, Michael Graetzel
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Publication number: 20140097376Abstract: 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: ApplicationFiled: December 12, 2013Publication date: April 10, 2014Applicant: Ecole Polytechnique Federale de Lausanne (EPFL)Inventors: Jing Zhang, Chengcheng Xi, Yiming Cao, Feifei Gao, Peng Wang, Shaik Mohammad Zakeeruddin, Michael Graetzel
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Patent number: 8686285Abstract: 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: GrantFiled: December 23, 2008Date of Patent: April 1, 2014Assignee: Ecole Polytechnique Federale de Lausanne (EPFL)Inventors: Jing Zhang, Chengcheng Xi, Yiming Cao, Feifei Gao, Peng Wang, Shaik Mohammad Zakeeruddin, Michael Graetzel
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Patent number: 8487119Abstract: 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: GrantFiled: February 3, 2009Date of Patent: July 16, 2013Assignee: Ecole Polytechnique Federale de Lausanne (EPFL)Inventors: Mingfei Xu, Hao Qin, Feifei Gao, Peng Wang, Shaik Mohammad Zakeeruddin, Michael Graetzel
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Publication number: 20110062541Abstract: 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: ApplicationFiled: February 27, 2009Publication date: March 17, 2011Inventors: Feifei Gao, Yuan Wang, Jing Zhang, Peng Wang, shaik Mohammad Zakeeruddin, Michael Graetzel
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Publication number: 20110041907Abstract: 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: ApplicationFiled: February 3, 2009Publication date: February 24, 2011Inventors: Mingfei Xu, Hao Qin, Feifei Gao, Peng Wang, Shaik Mohammad Zakeeruddin, Michael Graetzel
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Publication number: 20110012048Abstract: 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: ApplicationFiled: December 23, 2008Publication date: January 20, 2011Inventors: Jing Zhang, Chengcheng Xi, Yiming Cao, Feifei Gao, Peng Wang, Shaik Mohammad Zakeeruddin, Michael Graetzel