Patents by Inventor Zhi Xiang Voo

Zhi Xiang Voo 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).

  • Cyclic carbonate monomers and ring opened polycarbonates therefrom
    Patent number: 9624191
    Abstract: Eight-membered ring cyclic carbonates having an oxygen or an acylated nitrogen at position 6 were prepared by reaction of precursor diols with ethyl chloroformate. The cyclic carbonates undergo organocatalyzed ring opening polymerization. In one instance, the initial polymer formed comprises a carbonate repeat unit having a Boc-protected nitrogen in the polymer backbone. Deprotecting the nitrogen with acid forms a cationic carbonate repeat unit having a positive charged secondary ammonium nitrogen in the polymer backbone.
    Type: Grant
    Filed: September 23, 2015
    Date of Patent: April 18, 2017
    Assignees: International Business Machines Corporation, Agency For Science, Technology And Research
    Inventors: Mareva B. Fevre, James L. Hedrick, Victor W. L. Ng, Robert J. Ono, Shrinivas Venkataraman, Zhi Xiang Voo, Yi Yan Yang
  • CYCLIC CARBONATE MONOMERS AND RING OPENED POLYCARBONATES THEREFROM
    Publication number: 20160009860
    Abstract: Eight-membered ring cyclic carbonates having an oxygen or an acylated nitrogen at position 6 were prepared by reaction of precursor diols with ethyl chloroformate. The cyclic carbonates undergo organocatalyzed ring opening polymerization. In one instance, the initial polymer formed comprises a carbonate repeat unit having a Boc-protected nitrogen in the polymer backbone. Deprotecting the nitrogen with acid forms a cationic carbonate repeat unit having a positive charged secondary ammonium nitrogen in the polymer backbone.
    Type: Application
    Filed: September 23, 2015
    Publication date: January 14, 2016
    Inventors: Mareva B. Fevre, James L. Hedrick, Victor W.L. Ng, Robert J. Ono, Shrinivas Venkataraman, Zhi Xiang Voo, Yi Yan Yang