Patents by Inventor Jonathan L. Allis

Jonathan L. Allis 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 magnets
    Patent number: 5400786
    Abstract: An MRI magnet arrangement comprises, an annular electromagnet defined by a coil, an annular shim of magnetic material coaxially disposed within the coil, first permanent magnet means having a field, the direction of which is the same as the field of the coil, disposed coaxially within the said shim and second permanent magnet means disposed coaxially within the said first permanent magnet means, the field of which is arranged to be opposite in direction to the field produced by the said first permanent magnet means, the arrangement being such that the magnetic field produced in an imaging volume within the said second permanent magnet means is substantially homogeneous.
    Type: Grant
    Filed: January 4, 1994
    Date of Patent: March 28, 1995
    Assignee: Oxford Magnet Technology Limited
    Inventor: Jonathan L. Allis