Patents by Inventor Charles H. Swope

Charles H. Swope 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).

  • Liquid crystal device for calibration and testing of optical instruments
    Patent number: 5030005
    Abstract: A device and method for optical calibration of an optical instrument that measures optical characteristics along an optical path. A controllable shutter having electrically alterable optical characteristics is placed across the optical path of the instrument. An electrical control is connected to the shutter for selectively providing a variable voltage to the shutter to electrically alter optical characteristics of the shutter in a controlled manner so that the optical characteristics of the shutter correspond to selected optical characteristics.
    Type: Grant
    Filed: November 29, 1989
    Date of Patent: July 9, 1991
    Assignee: Akzo N.V.
    Inventors: Charles H. Swope, John G. Link, Douglas G. Haugen