Patents by Inventor Frederick R. N. Stephens

Frederick R. N. Stephens 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).

  • Pulse curve analyser
    Patent number: 4442845
    Abstract: Disclosed is a pulse curve analyser for determining and displaying data on the rise time and/or fall time of an analog signal representing a transient cycle of a patient's body tissue pulsative blood color and/or density change waveform produced by physiological circulation activity.
    Type: Grant
    Filed: November 10, 1981
    Date of Patent: April 17, 1984
    Inventor: Frederick R. N. Stephens