Patents by Inventor VAN MAI DO

VAN MAI DO 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).

  • Refocusing pulses and excitation pulses for NMR logging
    Patent number: 10962674
    Abstract: Illustrative embodiments are directed to applying a nuclear magnetic resonance sequence to a substance within an inhomogeneous static magnetic field. Various embodiments include applying a series of refocusing pulses to the substance, each refocusing pulse in the series of refocusing pulses having at least two segments, and a total pulse duration less than or equal to approximately 1.414 times T180. Various embodiments can further include applying an excitation pulse to the substance in the inhomogeneous static magnetic field, where the excitation pulse generates an initial magnetization that is aligned with a refocusing axis produced by a refocusing cycle that is performed after the excitation pulse.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: March 30, 2021
    Assignee: Schlumberger Technology Corporation
    Inventors: Martin D. Hürlimann, Soumyajit Mandal, Van Mai Do, Yi-Qiao Song
  • REFOCUSING PULSES AND EXCITATION PULSES FOR NMR LOGGING
    Publication number: 20170357025
    Abstract: Illustrative embodiments are directed to applying a nuclear magnetic resonance sequence to a substance within an inhomogeneous static magnetic field. Various embodiments include applying a series of refocusing pulses to the substance, each refocusing pulse in the series of refocusing pulses having at least two segments, and a total pulse duration less than or equal to approximately 1.414 times T180. Various embodiments can further include applying an excitation pulse to the substance in the inhomogeneous static magnetic field, where the excitation pulse generates an initial magnetization that is aligned with a refocusing axis produced by a refocusing cycle that is performed after the excitation pulse.
    Type: Application
    Filed: April 21, 2017
    Publication date: December 14, 2017
    Inventors: MARTIN D. HÜRLIMANN, SOUMYAJIT MANDAL, VAN MAI DO, YI-QIAO SONG
  • Refocusing pulses and excitation pulses for NMR logging
    Patent number: 9658358
    Abstract: Illustrative embodiments are directed to applying a nuclear magnetic resonance sequence to a substance within an inhomogeneous static magnetic field. Various embodiments include applying a series of refocusing pulses to the substance, each refocusing pulse in the series of refocusing pulses having at least two segments, and a total pulse duration less than or equal to approximately 1.414 times T180. Various embodiments can further include applying an excitation pulse to the substance in the inhomogeneous static magnetic field, where the excitation pulse generates an initial magnetization that is aligned with a refocusing axis produced by a refocusing cycle that is performed after the excitation pulse.
    Type: Grant
    Filed: December 27, 2011
    Date of Patent: May 23, 2017
    Assignee: SCHLUMBERGER TECHNOLOGY CORPORATION
    Inventors: Martin D. Hürlimann, Soumyajit Mandal, Van Mai Do, Yi-Qiao Song
  • REFOCUSING PULSES AND EXCITATION PULSES FOR NMR LOGGING
    Publication number: 20130162247
    Abstract: Illustrative embodiments are directed to applying a nuclear magnetic resonance sequence to a substance within an inhomogeneous static magnetic field. Various embodiments include applying a series of refocusing pulses to the substance, each refocusing pulse in the series of refocusing pulses having at least two segments, and a total pulse duration less than or equal to approximately 1.414 times T180. Various embodiments can further include applying an excitation pulse to the substance in the inhomogeneous static magnetic field, where the excitation pulse generates an initial magnetization that is aligned with a refocusing axis produced by a refocusing cycle that is performed after the excitation pulse.
    Type: Application
    Filed: December 27, 2011
    Publication date: June 27, 2013
    Inventors: MARTIN D. HÜRLIMANN, SOUMYAJIT MANDAL, VAN MAI DO, YI-QIAO SONG