Patents by Inventor Dahai Chen

Dahai Chen 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: 12062907
    Abstract: The present disclosure relates to a method for protecting DC line impedance phase based on protection and control coordination, and an application scenario of the method for protecting is a three-terminal flexible DC transmission network. The method uses high controllability of a converter after a fault, injects a characteristic signal at a characteristic frequency, and calculates a phase angle of input impedance to determine a fault interval, which effectively improves protection performance, turns passive to active, and is not affected by nonlinearity of the converter. At the same time, compared with a full-bridge MMC, using a half-bridge MMC does not need to perform fault ride-through first when identifying a fault, and does not need to add additional equipment, it creates fault features and can reliably identify an fault interval; improves protection quickness and at the same time also has better economic benefits.
    Type: Grant
    Filed: July 1, 2022
    Date of Patent: August 13, 2024
    Assignee: Beijing Jiaotong University
    Inventors: Meng Li, Jinghan He, Keao Chen, Dahai Zhang, Pinghao Ni, Yin Xu, Xiaojun Wang, Guomin Luo, Xiangyu Wu, Fang Zhang
  • Patent number: 9650390
    Abstract: The present invention discloses a class of water soluble taxane derivatives, a method for treating tumor using the same, use thereof as anti-tumor drugs and use thereof in the preparation of anti-tumor drugs. The water soluble taxane derivatives have the general formula (I-1), (I-2) or (I-3): wherein, R1 is H or methyl; R2 is H, methyl or acetyl; R3 is phenyl or OC(CH3)3; X is H, C1-6 alkyl or F; Y is F or C1-6 alkyl substituted with one or more F; n is 1, 2, 3, 4, 5 or 6; W is NR4R5.A or R4 and R5 are each independently H, C1-6 alkyl optionally substituted with phenyl, or C3-6 cycloalkyl; m is 0, 1, 2 or 3; and A is a pharmaceutically acceptable acid.
    Type: Grant
    Filed: February 16, 2015
    Date of Patent: May 16, 2017
    Assignee: JIANGSU NHWALUOKANG PHARMCEUTICAL RESEARCH AND DEVELOPMENT CO., LTD
    Inventors: Qingeng Li, Tao Wang, Gang Chen, Yuanzhong Wang, Wei Mao, Lingguo Zeng, Tong Wu, Dahai Chen
  • Publication number: 20170057973
    Abstract: The present invention discloses a class of water soluble taxane derivatives, a method for treating tumor using the same, use thereof as anti-tumor drugs and use thereof in the preparation of anti-tumor drugs. The water soluble taxane derivatives have the general formula (I-1), (I-2) or (I-3): wherein, R1 is H or methyl; R2 is H, methyl or acetyl; R3 is phenyl or OC(CH3)3; X is H, C1-6 alkyl or F; Y is F or C1-6 alkyl substituted with one or more F; n is 1, 2, 3, 4, 5or 6; W is NR4R5.A or and R5 are each independently H, C1-6 alkyl optionally substituted with phenyl, or C3-6 cycloalkyl; m is 0, 1, 2 or 3; and A is a pharmaceutically acceptable acid.
    Type: Application
    Filed: February 16, 2015
    Publication date: March 2, 2017
    Inventors: Qingeng Li, Tao Wang, Gang Chen, Yuanzhong Wang, Wei Mao, Lingguo Zeng, Tong Wu, Dahai Chen
  • Patent number: D818524
    Type: Grant
    Filed: February 23, 2017
    Date of Patent: May 22, 2018
    Assignee: PAX COMPUTER TECHNOLOGY (SHENZHEN) CO., LTD.
    Inventors: Deqiang Dong, Yuzhuo Wang, Dahai Chen
  • Patent number: D861684
    Type: Grant
    Filed: January 15, 2018
    Date of Patent: October 1, 2019
    Assignee: PAX COMPUTER TECHNOLOGY (SHENZHEN) CO., LTD.
    Inventors: Dahai Chen, Yuzhuo Wang