Method for compensation of dark current of ccd-sensor in dental x-raying
CA 2134875 A1 · Owner: Nelvig, Per · Inventors: Nelvig, Per
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present method and device according to the invention is by a compensation signal to guarantee that picture element within preferably faintly exposed image areas in dental x-raying will be located within a desired signal level interval which on a video, monitor (25) is corresponding to the light intensity which should have been obtained with a dental x-ray film to thereby on the, video monitor (25) facilitate improved dynamics and thus obtain maximum imaging sensitivity for gray level variations e.g. enamel, and dentine in dental x-raying. Additionally is achieved that the strong dependence of the image sensor to e.g. ambient, temperature regarding its dark current is compensated by a …
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 7, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 7, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 7, 2015.
- 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.