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:
Jan. 18, 2011
Filed:
Jul. 15, 2005
Joshua Robert Nemeth, Elwood, AU;
Gary Fairless Power, Greenvale, AU;
Robert Stewart, Wigton, GB;
Securency International Pty Ltd, Craigieburn, Victoria, AU;
Abstract
A method of producing a security document or article including a substrate (), which is transparent at least to visible light, and a diffractive optical microstructure (). The method includes applying an opacifying layer () to at least one surface of the transparent substrate (). An area of the opacifying layer () is exposed to laser radiation () to ablate apertures () in selected portions of the opacifying layer (), thereby forming a diffractive optical microstructure () on the surface of the substrate (). The laser radiation may be patterned prior to exposing the opacifying layer (), for example by passing the radiation through a mask (). Alternatively, a focussed or collimated laser beam () may be directed onto the selected portions of the opacifying layer (). Laser radiation may be directed onto the opacifying layer () either directly, or through the transparent substrate (). Security documents or articles made in accordance with the method are also provided.