Patents by Inventor Benjamin K. Ofori-Okai

Benjamin K. Ofori-Okai 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).

  • Systems, apparatus, and methods of nonlinear terahertz (THz) magnetic resonance measurement
    Patent number: 10495703
    Abstract: A nonlinear terahertz (THz) spectroscopy technique uses a sample illuminated by two THz pulses separately. The illumination generates two signals BA and BB, corresponding to the first and second THz pulse, respectively, after interaction with the sample. The interaction includes excitation of at least one ESR transition in the sample. The sample is also illuminated by the two THz pulses together, with an inter-pulse delay ?, generating a third signal BAB. A nonlinear signal BNL is then derived via BNL=BAB?BA?BB. This nonlinear signal BNL can be then processed (e.g., Fourier transform) to study the properties of the sample.
    Type: Grant
    Filed: March 9, 2018
    Date of Patent: December 3, 2019
    Assignee: Massachusetts Institute of Technology
    Inventors: Harold Young Hwang, Jian Lu, Yaqing Zhang, Benjamin K. Ofori-Okai, Keith A. Nelson, Xian Li
  • Systems, Apparatus, and Methods of Nonlinear Terahertz (THz) Magnetic Resonance Measurement
    Publication number: 20190086486
    Abstract: A nonlinear terahertz (THz) spectroscopy technique uses a sample illuminated by two THz pulses separately. The illumination generates two signals BA and BB, corresponding to the first and second THz pulse, respectively, after interaction with the sample. The interaction includes excitation of at least one ESR transition in the sample. The sample is also illuminated by the two THz pulses together, with an inter-pulse delay ?, generating a third signal BAB. A nonlinear signal BNL is then derived via BNL=BAB?BA?BB. This nonlinear signal BNL can be then processed (e.g., Fourier transform) to study the properties of the sample.
    Type: Application
    Filed: March 9, 2018
    Publication date: March 21, 2019
    Inventors: Harold Young Hwang, Jian Lu, Yaqing Zhang, Benjamin K. Ofori-Okai, Keith A. Nelson, Xian Li
  • Systems, apparatus, and methods of nonlinear terahertz (THz) magnetic resonance measurement
    Patent number: 9945914
    Abstract: A nonlinear terahertz (THz) spectroscopy technique uses a sample illuminated by two THz pulses separately. The illumination generates two signals BA and BB, corresponding to the first and second THz pulse, respectively, after interaction with the sample. The interaction includes excitation of at least one ESR transition in the sample. The sample is also illuminated by the two THz pulses together, with an inter-pulse delay ?, generating a third signal BAB. A nonlinear signal BNL is then derived via BNL=BAB?BA?BB. This nonlinear signal BNL can be then processed (e.g., Fourier transform) to study the properties of the sample.
    Type: Grant
    Filed: May 19, 2017
    Date of Patent: April 17, 2018
    Assignee: Massachusetts Institute of Technology
    Inventors: Harold Young Hwang, Jian Lu, Yaqing Zhang, Benjamin K. Ofori-Okai, Keith A. Nelson, Xian Li
  • Systems, Apparatus, and Methods of Nonlinear Terahertz (THz) Magnetic Resonance Measurement
    Publication number: 20170336482
    Abstract: A nonlinear terahertz (THz) spectroscopy technique uses a sample illuminated by two THz pulses separately. The illumination generates two signals BA and BB, corresponding to the first and second THz pulse, respectively, after interaction with the sample. The interaction includes excitation of at least one ESR transition in the sample. The sample is also illuminated by the two THz pulses together, with an inter-pulse delay ?, generating a third signal BAB. A nonlinear signal BNL is then derived via BNL=BAB?BA?BB. This nonlinear signal BNL can be then processed (e.g., Fourier transform) to study the properties of the sample.
    Type: Application
    Filed: May 19, 2017
    Publication date: November 23, 2017
    Inventors: Harold Young HWANG, Jian Lu, Yaqing Zhang, Benjamin K. Ofori-Okai, Keith A. Nelson, Xian Li