Hue compensation apparatus for a color hard copy machine
CA 2039591 C · Owner: Kabushiki Kaisha Toshiba · Inventors: Machida, Toshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hue compensation apparatus outputs hue-compensated data of a color designated by an input color selection signal of red green, and blue, responsive to red, green and blue input signals. The hue compensation apparatus uses first, second and third lookup table circuits, a decoder, a polarizing circuit and a synthesizing circuit. The lookup table circuits output hue-compensated red green and blue sig-, nals in response to input red green and blue signals, respectively. The decoder decodes the input color selection signal and the polariza-, tion circuit polarizes outputs from the first second and third lookup, table circuits according to an output of the decoder. The synthesizing circuit …
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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 April 2, 1991 and granted June 25, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 2, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 2, 2013.
- 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
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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.