Patents by Inventor Sang K. Chung

Sang K. Chung 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).

  • Atomic ion clock with two ion traps, and method to transfer ions
    Patent number: 8058936
    Abstract: An atomic ion clock with a first ion trap and a second ion trap, where the second ion trap is of higher order than the first ion trap. In one embodiment, ions may be shuttled back and forth from one ion trap to the other by application of voltage ramps to the electrodes in the ion traps, where microwave interrogation takes place when the ions are in the second ion trap, and fluorescence is induced and measured when the ions are in the first ion trap. In one embodiment, the RF voltages applied to the second ion trap to contain the ions are at a higher frequency than that applied to the first ion trap. Other embodiments are described and claimed.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: November 15, 2011
    Assignee: California Institute of Technology
    Inventors: John D. Prestage, Sang K. Chung
  • ATOMIC ION CLOCK WITH TWO ION TRAPS, AND METHOD TO TRANSFER IONS
    Publication number: 20090058545
    Abstract: An atomic ion clock with a first ion trap and a second ion trap, where the second ion trap is of higher order than the first ion trap. In one embodiment, ions may be shuttled back and forth from one ion trap to the other by application of voltage ramps to the electrodes in the ion traps, where microwave interrogation takes place when the ions are in the second ion trap, and fluorescence is induced and measured when the ions are in the first ion trap. In one embodiment, the RF voltages applied to the second ion trap to contain the ions are at a higher frequency than that applied to the first ion trap. Other embodiments are described and claimed.
    Type: Application
    Filed: August 29, 2008
    Publication date: March 5, 2009
    Applicant: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: John D. Prestage, Sang K. Chung