Patents by Inventor Yannis P. Tsavalas

Yannis P. Tsavalas 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).

  • Magnetic resonance imaging shimming by superconducting gradient shield
    Patent number: 5701075
    Abstract: A magnetic resonance imaging superconducting magnet including a cryostat, a gradient coil and superconducting gradient shield positioned around the gradient coil with an active resistive shimming member contiguous to the cryostat vessel; and the gradient shield being selectively cooled to superconducting operation after the magnetic shimming fields generated by the shimming member for field homogeneity within the bore of the magnetic resonance imaging magnet are induced onto, and maintained by, the superconducting gradient shield and operation of the resistive shimming member discontinued.
    Type: Grant
    Filed: January 4, 1996
    Date of Patent: December 23, 1997
    Assignee: General Electric Company
    Inventors: Bu-Xin Xu, Yannis P. Tsavalas
  • Superconducting gradient shields in magnetic resonance imaging magnets
    Patent number: 5539367
    Abstract: A magnetic resonance imaging magnet including a superconducting gradient shield positioned around the gradient coil and contiguous to the cryogen vessel, with the gradient shield being selectively placed in superconducting operation to shield the magnet coils and structures from the magnetic fields generated by firing the imaging gradient coil positioned within the bore of the magnetic resonance imaging magnet. A plurality of thermally conductive members are compressed between the cryogen vessel and the gradient shield.
    Type: Grant
    Filed: May 2, 1994
    Date of Patent: July 23, 1996
    Assignee: General Electric Company
    Inventors: Bu-Xin Xu, Yannis P. Tsavalas, Phillip W. Eckels
  • Support structure for actively shielded superconducting magnets
    Patent number: 5237300
    Abstract: A cantilevered trapezoidal-toroidal structure is provided in an active magnetic shielding system for a superconducting magnet to support the bucking magnet coils in spaced relationship to the main magnet coils.
    Type: Grant
    Filed: August 3, 1992
    Date of Patent: August 17, 1993
    Assignee: General Electric Company
    Inventors: Oluwasegun O. Ige, John J. Wollan, Yannis P. Tsavalas