Patents by Inventor Steven D. Pace

Steven D. Pace 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).

  • Modular MRI gradient amplifier using unipolar PWM drive
    Patent number: 6323649
    Abstract: A gradient amplifier (20), for driving a gradient coil (22) of an MRI scanner, includes a plurality of first modules (60). The first modules (60) provide unipolar PWM control of an input supplied thereto to generate a unipolar waveform. A high voltage DC power supply (64) electrically connected to the first modules (60) supplies the input to the first modules (60). At least one second module (140a, b) is electrically connected to the first modules (60). The second module (140a, b) selectively provides polarity switching of the unipolar waveform output from the first modules (60) to generate a bipolar waveform which drives the gradient coil (22).
    Type: Grant
    Filed: September 14, 1999
    Date of Patent: November 27, 2001
    Assignee: Picker International, Inc.
    Inventors: Steven D. Pace, Michael Burl, Douglas M. Blakeley