Patents by Inventor James Barras

James Barras 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).

  • NQR method and apparatus for testing a sample by applying multiple excitation blocks with different delay times
    Publication number: 20060226838
    Abstract: Methods of and apparatus for Nuclear Quadrupole Resonance (NQR) testing a sample containing quadrupolar nuclei exhibiting a given value of spin-lattice relaxation time, T1, are disclosed. The method comprises applying two excitation blocks to excite nuclear quadrupole resonance, there being a given delay time between the two blocks, detecting resonance response signals, and comparing the response signals from respective blocks. The delay time is less than the T1 value of the nuclei.
    Type: Application
    Filed: November 14, 2005
    Publication date: October 12, 2006
    Applicant: BTG International Limited
    Inventors: John Smith, James Barras, Neil Peirson
  • NQR method and apparatus for testing a sample by applying multiple excitation blocks with different delay times
    Patent number: 6577128
    Abstract: Methods of and apparatus for Nuclear Quadrupole Resonance (NQR) testing a sample containing quadrupolar nuclei exhibiting a given value of spin-lattice relaxation time, T1, are disclosed. The method comprises applying two excitation blocks to excite nuclear quadrupole resonance, there being a given delay time between the two blocks, detecting resonance response signals, and comparing the response signals from respective blocks. The delay time is less than the T1 value of the nuclei.
    Type: Grant
    Filed: November 5, 2001
    Date of Patent: June 10, 2003
    Assignee: BTG International Limited
    Inventors: John Alec Sydney Smith, James Barras, Neil Francis Peirson