Patents by Inventor Wancheng Zhu

Wancheng Zhu 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).

  • Calcium carbonate of different shapes and the preparation process thereof
    Publication number: 20040234443
    Abstract: This invention relates to calcium carbonate of different shapes including spindle, petal, whisker, needle, flake, ball and fiber. The calcium carbonate of such different shapes has an average particle size in the range of 10 nm-2.5 &mgr;m. This invention also relates to a process for preparing the said calcium carbonate with a controllable range of average particle size and different shapes. Precipitated powder of calcium carbonate with a desired shape and a controllable average particle size is obtained by carbonizing a suspension of calcium hydroxide and a feed gas containing carbon dioxide on a revolving bed under the gravitational field, and optionally in the presence of a crystal form-controller and/or crystal seeds. The precipitated powder of calcium carbonate obtained by the process according to this invention has a controllable average particle size and a narrow particle distribution.
    Type: Application
    Filed: June 30, 2004
    Publication date: November 25, 2004
    Inventors: Jianfeng Chen, Yuhong Wang, Zhigang Shen, Guangwen Chu, Wancheng Zhu
  • Cat toy
    Patent number: D989417
    Type: Grant
    Filed: October 28, 2022
    Date of Patent: June 13, 2023
    Inventor: Wancheng Zhu