Patents by Inventor Tang Wong

Tang Wong 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).

  • Synthesis of polyisoprene with neodymium catalyst
    Patent number: 6780948
    Abstract: The neodymium catalyst system prepared by the technique of this invention can be used in the polymerization of isoprene monomer into polyisoprene rubber that is clear (transparent) and of high purity. This invention more specifically discloses a process for the synthesis of polyisoprene rubber which comprises polymerizing isoprene monomer in the presence of a neodymium catalyst system, wherein the neodymium catalyst system is prepared by (1) reacting a neodymium carboxylate with an organoaluminum compound in the presence of isoprene for a period of about 10 minutes to about 30 minutes to produce neodymium-aluminum catalyst component, and (2) subsequently reacting the neodymium-aluminum catalyst component with a dialkyl aluminum chloride for a period of at least 30 minutes to produce the neodymium catalyst system.
    Type: Grant
    Filed: February 18, 2003
    Date of Patent: August 24, 2004
    Assignee: The Goodyear Tire & Rubber Company
    Inventors: Michael Joseph Rachita, Zhengfang Xu, Tang Wong
  • Synthesis of polyisoprene with neodymium catalyst
    Publication number: 20030187162
    Abstract: The neodymium catalyst system prepared by the technique of this invention can be used in the polymerization of isoprene monomer into polyisoprene rubber that is clear (transparent) and of high purity. This invention more specifically discloses a process for the synthesis of polyisoprene rubber which comprises polymerizing isoprene monomer in the presence of a neodymium catalyst system, wherein the neodymium catalyst system is prepared by (1) reacting a neodymium carboxylate with an organoaluminum compound in the presence of isoprene for a period of about 10 minutes to about 30 minutes to produce neodymium-aluminum catalyst component, and (2) subsequently reacting the neodymium-aluminum catalyst component with a dialkyl aluminum chloride for a period of at least 30 minutes to produce the neodymium catalyst system.
    Type: Application
    Filed: February 18, 2003
    Publication date: October 2, 2003
    Inventors: Michael Joseph Rachita, Zhengfang Xu, Tang Wong
  • Mobile phone
    Patent number: D1023994
    Type: Grant
    Filed: April 27, 2022
    Date of Patent: April 23, 2024
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Yang Wan, Ting Xu, Qingmeng Li, Po Ming Wong, Jingwei Tang, Yaqiong Yong, Yanxiang Xu, Fei Wang, Zedong Zeng