Patents by Inventor Yali Liu

Yali Liu 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).

  • Process for producing gold nanoparticles
    Patent number: 7232474
    Abstract: Gold nanoparticles having a particle size of 4-15 nM are synthesized by the reduction of hydrogen tetrachloroaurate (III) trihydrate using a suitable reducing agent such as sodium citrate in the presence of unmodified ?, ? or ?-cyclodextrin. The particle size is dependent upon the type and concentration of cyclodextrin and the reducing agent concentration. Gold nanoparticles having a particle size of 2-4 nM are produced by the reduction of hydrogen tetrachloroaurate (III) trihydrate using sodium borohydride in the presence of cyclodextrins.
    Type: Grant
    Filed: July 9, 2004
    Date of Patent: June 19, 2007
    Assignee: National Research Council of Canada
    Inventors: Pierre Bouvrette, Yali Liu, John H. T. Luong, Keith B. Male
  • Process for producing gold nanoparticles
    Publication number: 20050153071
    Abstract: Gold nanoparticles having a particle size of 4-15 nM are synthesized by the reduction of hydrogen tetrachloroaurate (III) trihydrate using a suitable reducing agent such as sodium citrate in the presence of unmodified ?, ? or ?-cyclodextrin. The particle size is dependent upon the type and concentration of cyclodextrin and the reducing agent concentration. Gold nanoparticles having a particle size of 2-4 nM are produced by the reduction of hydrogen tetrachloroaurate (III) trihydrate using sodium borohydride in the presence of cyclodextrins.
    Type: Application
    Filed: July 9, 2004
    Publication date: July 14, 2005
    Inventors: Pierre Bouvrette, Yali Liu, John Luong, Keith Male
  • Method and apparatus for internet-based telephone access to prepaid card and pin systems
    Patent number: 6438220
    Abstract: A method for providing a pre-paid telephone calling card services to a calling party initiating a voice-based connection to a called party telephone using an internet-based IP Phone process running on a personal computer. The method comprises initiating an A-leg connection between the IP Phone process and an internet gateway utilizing a computer network connecting the personal computer and the internet Gateway, establishing a telephone connection between the internet gateway and a SCP. Once this connection is established, the SCP transmits a request to the calling party through the IP Phone process to provide account and call information. The calling party responds with the requested account and call information using the IP Phone process. The internet gateway then transmits the information to the SCP using DTMF tones. The SCP responds by transmitting an account query from the SCP to verify account and balance information for the calling party.
    Type: Grant
    Filed: March 30, 2000
    Date of Patent: August 20, 2002
    Assignee: WorldCom, Inc.
    Inventor: Yali Liu