Patents by Inventor Yizeng Ni

Yizeng Ni 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).

  • Phosphorescent oxygen sensors
    Patent number: 6565992
    Abstract: A pressure sensor comprising a stable polymer having a backbone containing nitrogen and one or more of sulfur or phosphorous, and including a phosphorescent dye agent.
    Type: Grant
    Filed: November 10, 1998
    Date of Patent: May 20, 2003
    Inventors: Ian Manners, Xijia Gu, Zhen Pang, Mitchell A. Winnik, Yizeng Ni
  • Synthesis of polyamides in liquid and supercritical CO.sub.2
    Patent number: 6025459
    Abstract: A method of forming a polyamide from a corresponding nylon salt material comprises providing a reaction mixture comprising a nylon salt and carbon dioxide; and then condensing the nylon salt in the carbon dioxide to form a polyamide and water. A method of forming a polyamide comprises providing a reaction mixture containing at least one lactam monomer and carbon dioxide; and then polymerizing the lactam monomer in the carbon dioxide to form a polyamide.
    Type: Grant
    Filed: February 12, 1997
    Date of Patent: February 15, 2000
    Assignee: The University of North Carolina at Chapel Hill
    Inventors: Joseph DeSimone, Ramone Givens, Yizeng Ni
  • Synthesis of conductive polymers in liquid and supercritical CO.sub.2
    Patent number: 5855819
    Abstract: A method of forming an electrically conductive polymer comprises providing a reaction mixture in carbon dioxide, the reaction mixture comprising at least one monomer and a charge transfer agent. The monomer is then polymerized in the carbon dioxide to form a polymer, and the polymer is doped with the charge transfer agent so that the polymer is an electrically conductive polymer.
    Type: Grant
    Filed: March 27, 1997
    Date of Patent: January 5, 1999
    Assignee: University of North Carolina at Chapel Hill
    Inventors: Joseph M. DeSimone, Yizeng Ni