Patents by Inventor Merwyn D. Riddle

Merwyn D. Riddle 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).

  • Apparatus and method for using ultrasound to determine hematocrit
    Patent number: 4854170
    Abstract: This invention is an ultrasound apparatus for determining hematocrit. A sample of blood in a microhematocrit capillary tube is acoustically coupled to an ultrasound transducer which creates a standing wave in the blood sample. Red blood cells in the blood sample are packed in bands that correspond to the nodes of the standing wave. The thickness of the bands as a function of the thickness of the remaining plasma is an indication of the hematocrit of the blood sample.
    Type: Grant
    Filed: October 12, 1988
    Date of Patent: August 8, 1989
    Assignee: Separation Technology, Inc.
    Inventors: Owen D. Brimhall, Stephen C. Peterson, Charles D. Baker, Merwyn D. Riddle