The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 16, 2002
Filed:
Sep. 17, 1999
Paul Zientek, North Carlton, AU;
Securency Pty Ltd, Craigieburn, AU;
Abstract
A method of marking or forming a transparent window in an article , such as a security document, is provided in which areas of opacifying layers of printed ink on opposite surfaces of a polymeric film or substrate are irradiated by laser radiation of a selected wavelength. The opacifying layers have greater absorption characteristics for the laser radiation than the film or substrate which is substantially transparent to the selected wavelength of the laser radiation so that after ablation of the area of printed matter on one surface, the radiation passes through the substrate substantially unaffected to ablate the area of printed matter on the opposite surface. In the resultant article, the markings or windows formed by the areas of printing removed from each surface of the substrate are in register, and provide a deterrent against counterfeiting.