Process for visually detecting a colour drift in a polychrome reproduction
CA 2002949 A1 · Owner: Swiss Aluminium Ltd. · Inventors: Dolveck, Gilbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to the printing industry and is, based on the comparison of a reproduction under inspection with a reference polychrome graphic representation. Respective reference axes (A1,A2) are defined for the reference representation and the reproduction under inspection. These axes are normal to and go through an equivalent point of the representation and reproduction, respectively. The two latter are rotated around their reference axes, producing whirling images (D1,D2) formed of concentric color rings (a1,a2, ... an and a'1,a'2 ... a'n) each, having a set width and shade and forming a basis for detecting a, possible color drift. Figure 1.
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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 November 14, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 14, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 14, 2011.
- 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.