Technique for reverse transport of data in a hybrid fiber coax cable system
CA 2457447 A1 · Owner: Brooks, Paul D. · Inventors: Brooks, Paul D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a hybrid fiber coax (HFC) cable system (20) data is communicated upstream , from user terminals (100) to a headend (240) of the system (20) to realize various interactive services. The user terminals (100) generate analog modulated signals representing the user data which populate different , channels in a reverse passband of the system. In accordance with the invention, the analog modulated signals are transformed to the corresponding digital baseband signals containing the data. The resulting digital baseband signals are optically transmitted to the headend (240) thereby efficiently , utilizing the limited capacity of the fiber optical portion of the HFC cable system (20).
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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 31, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 31, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 2024.
- 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.