Color separation method and printed product of the method
CA 2415672 C · Owner: Weyerhaeuser Company · Inventors: Lee, David L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is described for overcoming the adverse visual effect of misregistered , ink planes in multiple ink color prints. Color separations are initially made in , a normal fashion. The separation carrying the greatest object detail is then chosen as a , luminance or achromatic channel. This may be used as is or preferably it is sharpened , using a high pass filter. Normally this separation will be black. However it , may be a , surrogate color for black particularly if only two or three separations are made. Object , detail in all other separations (chrominance separations) is degraded usually , by a low , pass filter such as a Gaussian blur. The printed image formed when the …
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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 January 7, 2003 and granted August 16, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 7, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 7, 2025.
- 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.