Patents by Inventor Matthew B. Baillie

Matthew B. Baillie 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 for measuring surface resistivity using square electrodes and multiplying surface resistance measurements by a correction factor
    Patent number: 5391994
    Abstract: This invention embodies a method and apparatus for determination of surface resistivity (.rho.) of materials to be used for a desired purpose. The surface resistivity is obtained by measuring surface resistance (R) of at least one square area of the material, and converting the surface resistance into a surface resistivity (.rho.) by a correction factor K (K=.rho./R) whenever the total area of the material is greater than three square area. The surface resistance is measured by placing a pair of square electrodes, spaced from each other a distance equal to the side of the square, applying measuring voltage potential to the electrodes, and determining the surface resistance of said at least one square area. The surface resistivity of materials of any size can be obtained by multiplying the surface resistance value by a correction factor determined for the size of the material being investigated.
    Type: Grant
    Filed: December 31, 1992
    Date of Patent: February 21, 1995
    Assignee: AT&T Corp.
    Inventors: Matthew B. Baillie, Ming-Chung Jon