Patents by Inventor Fred Charles Trusell

Fred Charles Trusell 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 comparing the color of a standard color with the color of a sample
    Patent number: 4043675
    Abstract: The color of a standard color is displayed adjacent a sample for direct comparison of the color of the sample with the color of the standard color by a method and apparatus comprising a color standard, a light source for supplying a uniform beam of light of a desired composition and intensity, means for receiving light from the light source and projecting the light onto the color standard, means for receiving light reflected from the color standard and transmitting the reflected light to a display means, and a display means for displaying the reflected light adjacent the sample to permit direct comparison of the color of the light reflected from the color standard with the color of the sample.
    Type: Grant
    Filed: April 26, 1976
    Date of Patent: August 23, 1977
    Assignee: Marathon Oil Company
    Inventors: Gottfried Kurt Guennel, Fred Charles Trusell