Color image reading apparatus
CA 2041008 C · Owner: Sato, Tsuneo · Inventors: Katoh, Masatoshi; Koike, Keiichi; Sato, Tsuneo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A color image reading apparatus comprises: a multi-chip image sensor having a plurality of image sensor units adapted to read a test chart comprising a color slip having a plurality of colors; and processing circuit for automatically calculating color correcting coefficients respectively for the plurality of image sensors, and storing them in memory. This will eliminate the difficulty that a plurality of image sensor units are different in color reproducibility, or similarly a plurality of color image reading apparatus are different in color reproducibility.
Read the whole patent
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 23, 1991 and granted September 9, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 23, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 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
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.