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CA 2016429 C · Owner: Sharp Kabushiki Kaisha · Inventors: Nagano, Fumikazu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a reader in which quantity of light emitted from a light source to be turned on in response to a lighting signal from a control circuit and reflected by an original document or transmitted through the original document is read by a solid image sensor receiving a clock signal from the control circuit so as to be converted into an analog signal such that the analog signal is converted by an A-D converter into a digital image signal having a predetermined number of bits, the improvement comprising: a level adjusting means for adjusting a white level of the analog signal to a reference white level which is provided, in the control circuit; the level adjusting means outputting, at the time of …
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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 May 9, 1990 and granted April 23, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 9, 2012.
- 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.