Patents by Inventor Warwick Edward Freeman

Warwick Edward Freeman 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).

  • Method and apparatus for buffering electrophysiological signals during an MRI procedure
    Patent number: 7693566
    Abstract: The subject invention overcomes the problem of electrical interference in signals taken during an MRI procedure by using a long cable and a unity gain buffer amplifier near the patient, with a low output impedance to drive the cable and thus greatly reduce the capacitively coupled interference. Passive low pass filtering is incorporated prior to the buffer amplifier to attenuate high frequency interference from the MRI system. Since the buffer amplifier requires no digital signals and does not emit high frequency signals, it does not interfere with the MRI system.
    Type: Grant
    Filed: October 18, 2004
    Date of Patent: April 6, 2010
    Assignee: Compumedics Limited
    Inventors: Richard Newman, Warwick Edward Freeman