Optically active structure for personalizing cards and the like, and method for the production thereof
CA 2417795 A1 · Owner: Kley, Ernst-Bernhard · Inventors: Zoellner, Karsten; Hecker, Hermann; Paeschke, Manfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an optically active microstructure for data carriers of all types in which irreversible changes (items of information) are written into at least one of several stacked films of the data carrier using a laser beam, and the items of information have from different visual angles to the , data carrier a different information content (tilt or wiggle image). The microstructure (1) is comprised of approximately strip-shaped adjoining regions (6, 7), which are parallel to one another and which are both , transparent. One region (7) supports a diffraction structure and the other , region (6) is not provided with a diffraction structure and the items of , information to …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed July 19, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 19, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 19, 2023.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.