Document carrying a legible code, and method and apparatus for producing same
Multi-tone cancellation phrase and background
Documents having a revealable concealed identifier and the method of making such documents
Copy indicator for a document
Currency paper, especially bank note, with a safety design and process for producing it
Varying tone securing document
Security printed documents
Varying tone security document
ApplicationNo. 611378 filed on 03/05/1996
US Classes:283/93, Having dot pattern283/72, HAVING REVEALABLE CONCEALED INFORMATION, FRAUD PREVENTER OR DETECTOR, USE PREVENTER OR DETECTOR, OR IDENTIFIER283/902, ANTI-PHOTOCOPY359/569Including particular grating characteristic
ExaminersPrimary: Fridie, Willmon Jr.
Attorney, Agent or Firm
Foreign Patent References
International ClassB42D 015/00
AbstractA security document is provided comprising a substrate having a top surface for carrying indicia. The top surface has a plurality of areas. Each of the areas contains background printed matter on the top surface. The background printed matter made up of a pattern of background elements. Each of the areas also contains a security term printed on the top surface of the substrate. The security term is composed of a pattern of security term elements. The background elements and/or the security term elements differ in element size, shape, angle, density, and/or frequency between adjacent areas. Also, within each of the areas either the background elements or the security term elements are not readily duplicated by a color copier while the remaining elements in the area are readily duplicated by a color copier. This results in a visually perceptible security term being produced upon copying of the security document.