Patents by Inventor Einar Tapio

Einar Tapio 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).

  • Discrete step remotely adjustable matching circuit for MRI RF coils
    Patent number: 5670881
    Abstract: An RF coil tuning circuit is disclosed in which two banks of parallel capacitive branches are provided. Each capacitive branch includes a fixed value capacitor, a relay and a PIN diode connected in series. An impedance of the tuning circuit is adjusted to the optimum VSWR=1 condition by first switching the eight PIN diodes to learn which open/closed condition applies the fixed value capacitors in the optimum combination. Then, the PIN diodes are all closed and the optimum combination is applied using the open/closed states of the relays.
    Type: Grant
    Filed: February 9, 1996
    Date of Patent: September 23, 1997
    Assignee: Toshiba America, Inc.
    Inventors: Mitsuaki Arakawa, John G. van Heteren, Joseph W. Carlson, Leon Kaufman, Einar Tapio