Patents by Inventor John Moberly

John Moberly 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).

  • MRI apparatus with external magnetic field compensation
    Patent number: 5214383
    Abstract: External field compensation is provided for MRI apparatus which is in a magnetically noisy environment such as that caused by nearby subway trains. By means of a magnetometer type sensor, the external field fluctuation is sensed and after being adjusted for the filtering effect of the magnet structure of the MRI device itself, the master oscillator of the MRI device is adjusted to compensate for the external field fluctuation. Alternatively the current of the magnet coil is adjusted.
    Type: Grant
    Filed: October 16, 1991
    Date of Patent: May 25, 1993
    Assignee: Resonex, Inc.
    Inventors: Robert J. Perlmutter, Brian P. Wilfley, Rick Motamedi, John Moberly