Method and apparatus for preventing unauthorized recording on tapes of video programmes
CA 2000423 A1 · Owner: Wijnen, Arie Marinus · Inventors: Wijnen, Arie Marinus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and an apparatus for preventing unauthorised recording on tapes of video programmes. A method and an apparatus for preventing unauthorised recording of video programmes on tape, in which the frame, repetition frequency of the signals to be transmitted is changed in such a manner, that, on the one hand the operation of a, television apparatus used for reproducing said signals will not be disturbed, but, on the other hand, the co-operation between the driving means for the tape and recording head displacement in the tape recording apparatus will be disturbed. The apparatus comprises an input stage (4) for digitalising the video signals a shift memory (5), an output stage (8) for …
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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 October 11, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 11, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 11, 2011.
- 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
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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.