Patents by Inventor Elizabeth Z. Shepherd

Elizabeth Z. Shepherd 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 the measurement of color properties of paint
    Patent number: 4936685
    Abstract: Measurement of the color properties of wet paint, such as lightness by colorimetry or photospectrometry, is carried out on a sample volume contained in a vessel and while the sample volume is subjected to shearing forces and advantageously also turbulence. The shearing and turbulence are created by a rotating disc having a spiral rib configuration on one surface which faces a window through which the measurements are made by a spectrophotometer.
    Type: Grant
    Filed: August 22, 1989
    Date of Patent: June 26, 1990
    Assignee: Imperial Chemical Industries, PLC
    Inventors: Celia C. Taylor, Elizabeth Z. Shepherd, Michael L. Colclough