Optical symbol reading device
CA 2273128 C · Owner: Nec Corporation · Inventors: Ishii, Kazuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
For receiving clear image data of symbols applied to the front surface or back surface of an article that is moved by for example, a conveyor and for which the reading distance is constantly changing a symbol reading device is provided with an image data input focus point control section that outputs position data of the article from a front surface/back surface position detector to an image data input focus point modifier such that the focus point of a camera or waist position of a laser beam for image data input can be constantly matched to the front surface or back surface of the article.
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 May 27, 1999 and granted April 22, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 27, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 27, 2021.
- 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.