Patents by Inventor Guogao ZHANG

Guogao ZHANG 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).

  • Method for controlling stress distribution in material and reading stress information
    Patent number: 10685200
    Abstract: The invention relates to a method for controlling the stress distribution in a material, comprising the steps of: a, preparing a crosslinked polymer containing reversible exchange bonds; b, applying an external force to the crosslinked polymer to cause a certain strain; c, specific region of the crosslinked polymer is selectively heated while maintaining the strain. This method controls and utilizes the internal stresses which are commonly considered as unfavorable. The invention also provides a method for reading information in a polarized light field, wherein the crosslinked polymer treated by the method is transparent under natural light. The information therein can be read only under polarized light, and possesses concealment.
    Type: Grant
    Filed: October 4, 2018
    Date of Patent: June 16, 2020
    Assignee: ZHEJIANG UNIVERSITY
    Inventors: Tao Xie, Jingjun Wu, Qian Zhao, Guogao Zhang
  • METHOD FOR CONTROLLING STRESS DISTRIBUTION IN MATERIAL AND READING STRESS INFORMATION
    Publication number: 20190108378
    Abstract: The invention relates to a method for controlling the stress distribution in a material, comprising the steps of: a, preparing a crosslinked polymer containing reversible exchange bonds; b, applying an external force to the crosslinked polymer to cause a certain strain; c, specific region of the crosslinked polymer is selectively heated while maintaining the strain. This method controls and utilizes the internal stresses which are commonly considered as unfavorable. The invention also provides a method for reading information in a polarized light field, wherein the crosslinked polymer treated by the method is transparent under natural light. The information therein can be read only under polarized light, and possesses concealment.
    Type: Application
    Filed: October 4, 2018
    Publication date: April 11, 2019
    Applicant: ZHEJIANG UNIVERSITY
    Inventors: Tao XIE, Jingjun WU, Qian ZHAO, Guogao ZHANG