Patents by Inventor Wayne Ropert Tompkin

Wayne Ropert Tompkin 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).

  • Publication number: 20080259456
    Abstract: Described is a security document with a transparent security element (12) which is arranged in a window or in a transparent region of the security document and has a structure layer, in which a first region (12f) of the structure layer has an asymmetrical diffractive relief structure, wherein the first region (12f) has an optical effect which is unexpectedly different in a front view and in a rear view of the security document.
    Type: Application
    Filed: June 9, 2006
    Publication date: October 23, 2008
    Inventors: Andreas Schilling, Wayne Ropert Tompkin, Rene Schaedler