Extended composite television systems
CA 2020366 A1 · Owner: N.V. Philips' Gloeilampenfabrieken · Inventors: Fuhren, Marcel
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PHN 13 017 18.11.1989, ABSTRACT, Extended composite television system According to an aspect of the invention the most, perceivable interference patterns occurring during display of an extended television signal on a standard receiver are precompensated in an extended encoding apparatus, preferably in such a manner that an extended decoding apparatus may cancel this precompensation again According to a further aspect of the invention the low-frequency, luminance interference patterns at the encoding end are calculated by approximation, whereafter, on the basis of this knowledge a low-, frequency portion of a luminance signal is modified in such a manner that the low-frequency brightness …
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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 July 4, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 4, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 4, 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.