Information adding/extracting method, information adding/extracting system, information signal processor and information signal recording medium
CA 2237975 A1 · Owner: Ogino, Akira · Inventors: Ogino, Akira
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A summing section adds, by summing process additional information corresponding to the least significant bit of the digital video signal S1 to the digital video signal S1 and records the video signal S2 to which the additional information is added to a recording medium with a writing section. When the video signal being, recorded on a recording medium, to which the additional information is added is duplicated to the other recording medium, the additional information is extracted for utilization by subtracting the original video signal to which the additional information is not added from the duplicated video signal to which the additional information is added.
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 19, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 19, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 19, 2020.
- 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.