Patents by Inventor Zoe M. E. Anderson

Zoe M. E. Anderson 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).

  • Copy indicating security device
    Patent number: 5479507
    Abstract: A copy indicating security device includes at least one symbol defined by a first arrangement of print elements, the or each symbol being provided in a background defined by a second arrangement of print elements. Under normal viewing conditions the security device presents a substantially flat tint to the eye. The first and second arrangements of print elements differ from one another so that on copying the device at least one of the symbols is revealed. The perimeter of the or each symbol is generally irregular.
    Type: Grant
    Filed: March 18, 1994
    Date of Patent: December 26, 1995
    Assignee: Thomas De La Rue Limited
    Inventor: Zoe M. E. Anderson